WASTE WATER TREATMENT SELECTION GUIDE · Cited Reference: “Guideline and Manual for Planning and...

Includes Bar Screen Specifications & Aerator Selection Guide (TRN technical manual)

Jan 2013

WASTE WATER TREATMENT

SELECTION GUIDE

Australian Pump Industries (02) 8865 3500

Established in 1924, Tsurumi is one of the world’s most experienced pump

manufacturers

Tsurumi first started producing submersible pumps in 1953 and through an ongoing and extensive research and development programme, has produced

many innovations in submersible pump design.

Tsurumi’s Kyoto Plant is the world’s most modern submersible pump manufacturing plant - total manufacturing capability: 1,000,000 units per year. Testing facilities with capability testing of large pumps up to 3.000 mm

bore.

Tsurumi produces more submersible pumps per year than any other

submersible pump manufacturer in the world (500,000 units per year).

Tsurumi offers over 1800 different models of submersible pumps

Types of submersible pumps produced:

Semi-Vortex, Vortex, Non Clog, Cutter, Mixed Flow, Axial Flow, Radial Flow, Contractor & Dewatering, Sewage & Wastewater, Aerators &

Blowers, Decanting Units, Scum Skimmers.

Established dealer network in Europe, North and South America, Asia,

Australia and parts of Africa.

At Tsurumi there is only one level of quality - the best

Who is Tsurumi ?

KE & KM Bar Screens

Mechanically cleaned bar screens; designed for the small plant inflows to remove solids from the wastewater, eliminating solids from aeration & Clarification tanks. Screen capacity range to 2,750 lpm. Bar spacing range from 1mm to 50mm. Screen is fabricate in 304 stainless steel for corrosion resistance. APPLICATION Primary treatment at a factory wastewater treatment plant Screening suspended solid from kitchen effluent at hotel, factory, hospital, etc. Screening suspended solid from wastewater at small scale wastewater facility

The KE/KS SERIES are front-type mechanical bar screens in which major parts are made of 304 stainless steel. The saw teeth on each rake travel between screen bars, which prevents foreign matters from lodging in the screen bars. The KS-series has an eccentric roller mechanism that pulls the rake out of the screen bars at the solids releasing point and eliminates the jamming of solids.

The KM/KMA SERIES are rear-type mechanical bar screens in which major parts are made of 304 stainless steel. The chain and sprocket do not come in contact with the liquid that prevents sticking of solids to the rotating parts. Being a self-standing design, it can be directly installed to a U-shaped waterway.

All liquid waste to be aerated must be screened first

1

CONTENTS

1. Introduction·········································································································································································· 2 2. Comparison of Aeration System/Equipment·········································································································· 2 3. Fluid to be Handled and Standard Specifications of TRN-series Aerators

3-1 Fluid to be Handled ··············································································································································· 3

3-2 Standard Specifications of TRN-series Aerators - 50Hz ····································································· 3

3-3 Standard Specifications of TRN-series Aerators - 60Hz ····································································· 3

4. Shape and Dimension of Aeration Tank

4-1 Typical Convection Pattern································································································································ 4

4-2 Shape of Aeration Tanks ····································································································································· 4

4-3 Recommended Tank Dimensions (Standard) ······························································································· 4

4-4 Notes to the Case that Two or More Aerators are to be installed in a Tank ································ 5

5. Aerator with Optional Stand or Draft Tube ············································································································ 6

5-1 Recommended Tank Dimensions (with Stand or Draft Tube)······························································· 6

6. Oxygen Transfer Rate ····················································································································································· 7 6-1 Oxygen Transfer Rate Test Result ·············································································································· 7

6-2 Oxygen Transfer Rate vs. Water Depth Curve - 50Hz ······································································ 8

6-3 Oxygen Transfer Rate vs. Water Depth Curve - 60Hz ····································································9

7. Operation System

7-1 Reduced Speed Operation by Variable Frequency Drive (VFD) ························································10

7-1-1 Comparisons in the Method of Adjustment ······················································································10

7-1-2 Comparisons in Adjustment Range (for reference only)······························································10

7-1-3 Characteristics of Reduced Speed Operation by VFD (for reference only)························10

7-2 Operation in combination with Blower··········································································································11

7-2-1 Comparison against Other Deep Aeration Methods (in case the tank depth is 10m) ·············11

7-2-2 Equipment necessary for this Operation ···························································································12

7-2-3 Operation························································································································································13

7-2-4 Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz)···························································13

7-2-5 Selection Procedure (Example) ············································································································· 14

7-2-6 Recommended Tank Dimensions (combination with blower) ·····················································14

7-2-7 Initially Targeted Operating Point of Blower and

7-2-7 Operating Range of Aerator on Running Current (combination with blower - 50Hz) ··············15

7-2-8 Initially Targeted Operating Point of Blower and

7-2-7 Operating Range of Aerator on Running Current (combination with blower - 60Hz) ··············15

7-2-9 Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz)·················16

7-2-10 Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 60Hz)···············17

7-2-11 Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz)················ 18

7-2-12 Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 60Hz)················ 19

8. About Noise ········································································································································································· 20

8-1 Measured Point and Condition··························································································································· 20

8-2 Measured Sound Pressure Level Data ··········································································································· 20

2

aa

1. Introduction The TRN aerator employs a special impeller that draws air by its self-aspiration force, and the air sucked down into the aerator is subjected to an air/water collision within the guide vane, and then this mixed air-water current is forcibly discharged through the discharge outlets. This aerator is excellent in durability by its unique “air seal” system and has a superior maintainability in spite of its simple structure.

2. Comparison of Aeration System/Equipment Fine Bubble Aeration (✳)

Line Aeration Method Full Aeration

Method

Submersible

Aerator

(TRN-series)

Submersible Air Mixer (TAR-series)(+ Rotary Blower,

RSR) Plate Diffuser Tube Diffuser Plate Diffuser

Air (Self-aspiration)

Air

General

Description

A special impeller for a self-aspiration

force draws air without blower, and the air sucked down

into the water is subjected to an

air/water collision within the guide vane, and then

this mixed air-water current

is forcibly discharged through

the discharge outlets.

With the combinationof a blower,

high-efficient oxygentransferring and

mixing is possible bythe high efficiency impeller and the four-direction

discharge; This canbe used for either

anaerobic or aerobictreatment.

It consists of plate-shape

diffusers formed byuniformly sized

ceramic particles orporous resin.

It consists of cylindrical diffusers formed by uniformly

sized ceramic particles or porous

resin.

It is formed by uniformly sized

ceramic particles orby porous resin plates. It is

smaller than the line aeration

method diffusers, and the

bubbles are finer than the plate

diffuser or tube diffuser.

Material

(Diffuser Part)

Stainless Steel

(Impeller)

Stainless Steel (Discharge Part of

the Air-supply Pipe)

Ceramic or Synthetic Resin

Oxygen Transfer Efficiency (Clean Water / Water Depth ： 5m)

17 to 23％ 20 to 30％ 14 to 16％ 20 to 32％

Intermittent Operation

Possible

Impossible

Need for a Blower or Air

Piping

Unnecessary (Air-inlet Pipe and Silencer needed)

Necessary

Overhaul

Simple structure, same as the

submersible pumps, makes it easy for

maintenance.

When maintenance is required, it should be taken to the factory because of built-in reduction gears.

Necessary to drain sewage water from

the tank

Controllability

It is possible to be controlled by a VFD

to some extent. (See p.10 7-1. Reduced Speed

Operation by VFD)

Well-controllable no limit of air flow

rate

Less Controllable Minimum air flow rate has been determined

Other Well-durability by the air seal

Highly efficient in oxygen transfer rate per unit of electric power. Can be used

for anaerobic aeration.

Aging increase in pressure loss

✳ Cited Reference: “Guideline and Manual for Planning and Design in Sewerage Systems (2001)” issued by Japan Sewerage Works Association

(Oxygen transfer efficiencies of the TRN-series are those calculated from the oxygen transfer rate at 5 meter’s depth on the curves of 6-2. and 6-3. “Oxygen Transfer Rate vs. Water Depth Curve” on pages 8 and 9 and the inhaled air flow rate, for the models that have the maximum water depth of 6 meters.)

Holder

Air

Air

Air

Air DiffuseAir

3

3. Fluid to be Handled and Standard Specifications of TRN-series Aerators

■ 3-1. Fluid to be Handled Liquid to be Handled

Type of Liquid Temperature

[oC] pH

Chlorine Ion Concentration

[mg/l]

Electrical Conductivity [μS/cm]

Gas to be Handled (Suction through the air-inlet pipe)

Wastewater & sewage 0 to 40 5 to 9 Below 1000 Below 1000 Should not be inflammable,

corrosive, or toxic

Caution

■ 3-2. Standard Specifications of TRN-series Aerators - 50Hz Cabtyre Cable Air-

inlet

Bore

[mm]

Model

Motor

Output

[kW]

Starting

Method

Max Water Depth(MWD)

[m]

Air Flow Rate - MWD

[m3/h]-[m]

No. of

Outlets

Impeller

Passage

[mm]

Mass

(Weight)

[kg] Material

Cores

x mm2

OuterDia.

[mm]

Length

[m]

32TRN2.75-52 0.75 D.O.L 3.5 7 – 3.5 6 10 55 PVC 4x 1.25 11.1 6 32

32TRN21.5-52 1.5 D.O.L 3.5 20 – 3.5 6 12 55 PVC 4x 1.25 11.1 6

50TRN42.2-52 2.2 D.O.L 3.6 39 – 3.6 6 12 140 PVC 4 x 2 11.8 6

50TRN43.7-52 3.7 D.O.L 4 55 – 4 6 12 150 PVC 4 x 2 11.8 6 50

50TRN45.5-52 5.5 D.O.L 4 78 – 4 6 15 170 CR 4 x 3.5 14.1 8

80TRN47.5-52 7.5 D.O.L 4.5 124 – 4.5 6 15 190 CR 4 x 5.5 16.8 8

80TRN412-52 12 Star-Delta 6 157 – 6 6 15 200 CR 4 x 3.5 3 x 3.5 2x 1.25

14.1 12.9 10.5

8 80

80TRN417-52 17 Star-Delta 6 202 - 6 6 15 220 CR 4 x 5.5 3 x 5.5 2x 1.25

16.8 15.2 10.5

8

100 100TRN424-52 24 Star-Delta 6 388 - 6 8 22 460 CR 4 x 14 3 x 14 2x 1.25

21.7 19.7 10.5

10


21.7 19.7 10.5

10

■ 3-3. Standard Specifications of TRN-series Aerators - 60Hz

Cabtyre Cable Air-

inlet

Bore

[mm]

Model

Motor

Output

[kW]

Starting

Method

Max Water Depth(MWD)

[m]

Air Flow Rate - MWD

[m3/h]-[m]

No. of

Outlets

Impeller

Passage

[mm]

Mass

(Weight)

[kg] Material

Cores

x mm2

OuterDia.

[mm]

Length

[m]

32TRN2.75-62 0.75 D.O.L 3.5 8 – 3.5 6 10 55 PVC 4x 1.25 11.1 6 32

32TRN21.5-62 1.5 D.O.L 3.5 17 – 3.5 6 12 55 PVC 4x 1.25 11.1 6

50TRN42.2-62 2.2 D.O.L 3.6 38 – 3.6 6 12 140 PVC 4 x 2 11.8 6

50TRN43.7-62 3.7 D.O.L 4 60 – 4 6 12 150 PVC 4 x 3.5 13.9 6 50

50TRN45.5-62 5.5 D.O.L 4 79 – 4 6 15 170 CR 4 x 3.5 14.1 8

80TRN47.5-62 7.5 D.O.L 4.5 112 – 4.5 6 15 190 CR 4 x 5.5 16.8 8

80TRN412-62 12 Star-Delta 6 155 – 6 6 15 200 CR 4 x 3.5 3 x 3.5 2x 1.25

14.1 12.9 10.5

8 80

80TRN417-62 17 Star-Delta 6 220 - 6 6 15 220 CR 4 x 5.5 3 x 5.5 2x 1.25

16.8 15.2 10.5

8


21.7 19.7 10.5

10


21.7 19.7 10.5

10

Note:) Following notes are applicable to the above two tables.

✳ The air flow rates are expressed at the standard conditions.: Temperature 20oC, 1atm

✳ The air flow rates may vary by up to approximately 5%.

✳ The Maximum Water Depth (MWD) is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overload, and then the motor protection device will operate, which makes it impossible to run continuously.

✳ Mass (Weights) excluding cable.

✳ PVC = PVC sheathed cable CR = Chloroprene rubber sheathed cable

● We assume no responsibility for any damages resulting from solids that enter even through the air-inlet pipe. ● We do not indemnify for any secondary, consequential or incidental damages caused by a fault of the TRN aerator.

4

4. Shape and Dimension of Aeration Tank ■ 4-1. Typical Convection Pattern

■ 4-2. Shape of Aeration Tanks

Dimension of Sub-convection ■ 4-3. Recommended Tank Dimensions (Standard) Rectangular Tank

(below 1 : 1.5)

Rectangular Tank

(below 1 : 2) Air- inlet Bore [mm]

Model Motor Output [kW]

Max. Water Depth [m]

Main Convection

Dia. [m]

Circular Tank φa [m]

Square Tank

a [m] a

[m] b

[m] a

[m] b

[m]

32TRN2.75-52/62 0.75 3.5 1.4 3.5 3 3.8 2.5 4 2 32

32TRN21.5-52/62 1.5 3.5 1.8 4.5 4 4.5 3 5 2.5

50TRN42.2-52/62 2.2 3.6 2.4 6 5.5 5.3 3.5 6 3

50TRN43.7-52/62 3.7 4 3 7 6.5 6.8 4.5 7 3.5 50

50TRN45.5-52/62 5.5 4 3.8 9 8 9 6 9 4.5

80TRN47.5-52/62 7.5 4.5 4.4 10 9 9.8 6.5 10 5

80TRN412-52/62 12 6 5.2 12 11 11.3 7.5 12 6 80

80TRN417-52/62 17 6 5.6 13 11.5 12 8 13 6.5

100 100TRN424-52/62 24 6 6.3 14.5 13 13.5 9 14 7

150 150TRN440-52/62 40 6 7.3 17 15 15.8 10.5 16 8

✳ Dimension of each tank has been determined at the maximum water depth. It shall be altered if the aerator is to be installed at a different depth.

✳ It is recommended to provide a haunch between the bottom of the tank and every side wall in order to maintain the mixing efficiency.

✳ The maximum water depth (MWD) is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overload, and then the motor protection device will operate, which makes it impossible to run continuously.

· Main Convection: Convection made by rising bubbles. (Theminimum distance that must be provided between eachaerator)

· Sub-convection: The maximum convection that can keep

solids suspended to prevent sedimentation of solids.

Sub‐convection

W.L

Main Convection

Diffused convection flow generated by the rising of bubbles

W.L W.L W.L

Circular Tank Square Tank Rectangular Tank

a a

a b

h h

h

φa

W.L W.L W.L

5

■ 4-4. Notes to the Case that Two or More Aerators are to be installed in a Tank. If there is a need to install two or more aerators having the same output in a tank, decide the place of installation paying attention to the distance between or among the aerators and the distance between the aerator and the tank’s sidewall. The distance between or among the aerators should be more than the “Main Convection Diameter” in the table of “4-3. Recommended Tank Dimensions (Standard)” on page 4. The distance between the aerator and the sidewall should be so decided that the main convection might not hit directly on the sidewall. In addition, it shall be taken into account that the area to be convected by one aerator must be small than “Dimension of Sub-convection” in the same table. ✳ If above-mentioned distances are smaller than the main convection, the aerator will suck the mixed air-water

current, and as a result it may lead to an unsteady operation of the aerator. ✳ If the area convected by one aerator is bigger than the sub-convection of each aerator, the sufficiency mixing

force does not spread throughout the tank, and as a result it may allow the sludge to settle at the tank bottom.

CIRCULAR TANK

Main Convection

SQUARE TANK Main Convection

RECTANGULAR TANK

Main Convection

Distance between the installed aerators should begreater than the main convection diameter.

Main ConvectionMain Convection

W.L

6

5. Aerator with Optional Stand or Draft Tube There may be a need to install the aerator at a deeper position than its MWD, for example;

· An aerator is going to be installed in an existing tank, and it is not possible to alter the depth of the tank, and · Because of the limited surface area, the tank must be designed to have a greater depth, etc.

Adoption of a Tsurumi aerator with optional stand or draft tube (DT) will be one of the solutions for these cases. In case of using a stand, the mixing force at the bottom will be weakened as the inlet port of the aerator moves away from the bottom. Therefore, we have set the height limit on the stand of 0.5 meters, and for the cases of more than 0.5meters are required, we recommend an aerator with a DT. Note that the oxygen transfer rate and the air flow rate of the aerator shall be those that are obtainable at its self-aspiration water depth d [installation water depth h – (minus) height of stand or DT]. In addition, it shall be noted that the performance of the aerator with DT can be slightly lower than that of the standard.

When there is a fear of overload occurring to the motor by due to a reason that it is going to operate in a viscous liquid, etc., it will be possible to prevent the overload by reducing the self-aspiration water depth d with this method.

The aerator may move or fall during operation by a reason that it is sitting on an irregular floor like slanted, bumpy, or slippery floor, or by a reason that it is installed in such that the weight of air-inlet piping acts on the aerator. Take an appropriate preventive measure in accordance with the conditions. In case that there is any flow generating equipment in the tank, the same measure must be required.

■ 5-1. Recommended Tank Dimensions (with Stand or Draft Tube) with Stand (0.5m) Draft Tube (1.0m) Draft Tube (1.5m)

Dimension of

Sub-convection Dimension of

Sub-convection Dimension of

Sub-convection Air- inlet Bore [mm]


Max Water Depth [m]

Installation Water

Depth h [m]


Square Tank

a [m]

Installation Water

Depth h [m]


Square Tank

a [m]

Installation Water

Depth h [m]


Square Tank

a [m]

32TRN2.75-52/62 0.75 3.5 4 3.5 3 32

32TRN21.5-52/62 1.5 3.5 4 4 3.5 50TRN42.2-52/62 2.2 3.6 4.1 5.5 5 4.6 5 4.5 50TRN43.7-52/62 3.7 4 4.5 6.5 6 5 6 5.5 50

50TRN45.5-52/62 5.5 4 4.5 8.5 7.5 5 8 7 80TRN47.5-52/62 7.5 4.5 5 9.5 8.5 5.5 9 8 80TRN412-52/62 12 6 6.5 11.5 10.5 7 11 10 80

80TRN417-52/62 17 6 6.5 12.5 11 7 12 10.5 100 100TRN424-52/62 24 6 6.5 14 12.5 7 13.5 12 7.5 13 11.5

150 150TRN440-52/62 40 6 6.5 16 14.5 7 15.5 13.5 7.5 15 13 ✳ Dimensions of each tank are those that have been determined under the condition that the self-aspiration water depth d equals to

the maximum water depth. These dimensions will vary depending on the installation water depth h.

✳ It is recommended to provide a haunch between the bottom of the tank and every sidewall in order to maintain the mixing efficiency.

✳ The aerator with a draft tube is not available in the shaded area.

✳ The maximum water depth is the limit of installation depth that the aerator can run without overload. The motor load increases as the installation depth becomes deeper, therefore, if the aerator is operated at a deeper position than this limit, the motor will be overloaded, and then the motor protection device will operate, which makes it impossible to run continuously.

✳ Refer to “4-1. Typical Convection Pattern” and “4-2. Shape of Aeration Tanks” on page 4 for the explanations on the tank shape and the dimension.

With a stand of 0.5m Image of 0.75kW

(Available 0.75kW to 40kW)

Suction Current

Discharge Current

Discharge Current

SuctionCurrent

Installation Water Depth h

WithOptional Stand

/ DT

Self-aspiration

Water Depth d

(Within MWD)

SuctionCurrent

With a DT of 1.0mImage of 5.5kW

(Available 22kW to 40kW)

With a DT of 1.5m Image of 40kW

(Available 24kW to 40kW)

Discharge Current

7

6. Oxygen Transfer Rate

The oxygen transfer rate is the speed that the oxygen in the air dissolves into a liquid. It can be a guide when a

biological treatment is going to be designed. The oxygen transfer rate is not the one that is directly measured. It is

given from the calculations taking various factors such as DO concentration, ambient temperature, and water

temperature, etc. The oxygen transfer rate may vary by up to approximately 10%. The tables 6-1. below show the results of the tests that have been carried out on the TRN aerators in our test tank.

It is suggested that these figures be used taking the above conditions into full consideration when selecting the

aerators. The measurement of DO has been made by a Non-steady State method at the condition of fresh water, 20oC, 1atm,

with the dissolved oxygen of 0mg/l. The air flow rates are those of standard condition, 20oC, 1atm. The aerator was

tested under its standard installation; placed at the center of the tank and at the standard installation depth.

■ 6–1. Oxygen Transfer Rate Test Result

▼ 50Hz Air-inlet

Bore

[mm]

Model

Motor

Output

[kW]

Installation

Water Depth h

(Standard)

[m]

Air Flow Rate[m3/h]

Oxygen Transfer Rate

[kgO2/h]

Test Tank Plane

Dimension [m] x [m]

32TRN2.75-52 0.75 3.5 7 0.6 32

32TRN21.5-52 1.5 3.5 20 1.1

50TRN42.2-52 2.2 3.6 39 2.4

50TRN43.7-52 3.7 4 55 4.2

Tank A

( 5 x 5 )

3 95 4.9 50

50TRN45.5-52 5.5 4 78 5.4

80TRN47.5-52 7.5 4.5 124 7.3

4 195 9.9 80TRN412-52 12

5 178 11.0 80

80TRN417-52 17 5 224 14.9

100 100TRN424-52 24 5 400 20.2

150 150TRN440-52 40 5 538 28.9

Tank B

( 10 x 10 )

▼ 60Hz

Air-inlet

Bore

[mm]

Model

Motor

Output

[kW]

Installation

Water Depth h

(Standard)

[m]

Air Flow Rate[m3/h]

Oxygen Transfer Rate

[kgO2/h]

Test Tank Plane

Dimension [m] x [m]

32TRN2.75-62 0.75 3.5 8 0.6 32

32TRN21.5-62 1.5 3.5 17 0.9

50TRN42.2-62 2.2 3.6 38 1.8

3 69 3.2 50TRN43.7-62 3.7

4 60 3.6

Tank A

( 5 x 5 )

50

50TRN45.5-62 5.5 4 79 4.8

80TRN47.5-62 7.5 4.5 112 6.6

4 185 8.6 80TRN412-62 12

5 176 9.9 80

80TRN417-62 17 5 232 12.5

100 100TRN424-62 24 5 368 17.9

150 150TRN440-62 40 5 555 27.6

Tank B

( 10 x 10 )

8

■ 6-2. Oxygen Transfer Rate vs. Water Depth Curve - 50Hz * Calculated from the test result of Table 6-1.

▼ The oxygen transfer rate may vary by up to approximately 10%. For the actual use, it may further vary depending on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin.

0.75kW and 1.5kW

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 1 2 3 4Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

32TRN21.5-52

32TRN2.75-52

2.2kW to 5.5kW

0

1

2

3

4

5

6

1 2 3 4 5Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

50TRN45.5-52

50TRN43.7-52

50TRN42.2-52

7.5kW to 17kW

0

2

4

6

8

10

12

14

16

1 2 3 4 5 6 7

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

80TRN417-52

80TRN412-52

80TRN47.5-52

24kW and 40kW

5

10

15

20

25

30

35

2 3 4 5 6 7

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

1 5 0TRN440-52

100TRN424-52

9

■ 6-3. Oxygen Transfer Rate vs. Water Depth Curve - 60Hz * Calculated from the test result of Table 6-1.

▼ The oxygen transfer rate may vary by up to approximately 10%. For the actual use, it may further vary depending on the type of liquid and the shape of tank, so that select a suitable aerator having a certain margin.

0.75kW and 1.5kW

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 1 2 3 4

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

3 2TRN21 .5-62

32TRN2 .75-62

2.2kW to 5.5kW

0

1

2

3

4

5

6

1 2 3 4 5

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

5 0TRN45 .5-62

50TRN43 .7-62

50TRN42 .2-62

7.5kW to 17kW

0

2

4

6

8

10

12

14

16

1 2 3 4 5 6 7

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h] 8 0TRN417-62

80TRN412-62

80TRN47 .5-62

24kW and 40kW

5

10

15

20

25

30

35

2 3 4 5 6 7

Water Depth [m]

Oxy

gen T

ransf

er

Rat

e [

kgO

2/h]

1 50TRN440-62

100TRN424-62

10

7. Operation System ■ 7-1. Reduced Speed Operation by Variable Frequency Drive (VFD) There are two methods in the adjustment of “air flow rate” and the “oxygen transfer rate” of the result. One is to squeeze the valve that is installed in the air-inlet piping, and the other is to reduce the speed of aerator by VFD. However, the aerator has the characteristics described below, and different effects are expected. · The motor load increases as the installation depth becomes deeper.

· The motor load increases as we reduce the air flow rate squeezing the valve that is installed in the air-inlet piping. In most cases, the adoption of reduced speed operation by VFD will enable us to regulate the air flow rate in a more extensive range than operating the valve, without sacrificing the efficiency. A comparison in the methods of adjustment is made in the following table. Refer to this table in your planning. The graph of 7-1-2. shows comparisons in adjustment range between the two methods and 7-1-3. shows characteristics of reduced speed operation by VFD for an aerator (Model 50TRN43.7-62) at 2 meters’ depth which has the widest possible range in the adjustment of air flow rate. ▼ 7-1-1. Comparisons in the Method of Adjustment

Methods for Adjustment

Features (○: shows the merit, ☓☓: shows the demerit)

Adjustment

by squeezing

the valve

○ Installation will be completed by simply connection the valve at the inlet port of the air-inlet pipe. ☓ Low power efficiency (kgO2/ kWh) ⇒ Disadvantage in the energy saving ☓ It is difficult to make an accurate control as the air flow rate and the operating current cannot be stabilized. ☓ Louder beat ☓ Narrow adjustment range at a deeper installation

Adjustment

by reducing

the speed

with a VFD

☓ It is necessary to install a VFD (extra initial cost is necessary). ○ The power efficiency (kgO2/ kWh) shall be maintained virtually constant.

⇒ Energy saving operation with reduced power consumption is possible. ○ The air flow rate and the running current can be maintained constant.

⇒ Possible to control the air flow rate and the oxygen transfer rate accurately. ○ Reduction of the operating frequency (reduction in air flow rate) will decrease the sound level.

▼ 7-1-2. Comparisons in Adjustment Range (for reference only) “①” shows the adjustment range served by a VFD, and “②” shows it served by a valve.

Estimated Air Flow Rate at the Standard Condition (20oC, 1atm) Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to 20oC

▼ 7-1-3. Characteristics of Reduced Speed Operation by VFD (for reference only)

Estimated Air Flow Rate at the Standard Condition (20oC, 1atm) Test Result at Our Test Tank (5m x 5m) with Clean Water, Converted to 20oC

20

30

40

50

60

70

80

90

35 40 45 50 55 60 65

Operation Frequency [Hz]

Air F

low

Rat

e [

m3/h

]

InstallationWater Depth

2 m


3 m


4 m

0.5

1

1.5

2

2.5

3

3.5

4

35 40 45 50 55 60 65

Operation Frequency ［Hz］

Oxy

ge T

rans

fer

Rate

［k

gO2/h

］


2 m


3 m


4 m

0.5

1

1.5

2

2.5

3

35 40 45 50 55 60 65


Oxy

gen T

rans

fer

Rate

[k

gO2/h]

Installation Water Depth2ｍ

※　モータ負荷の変化傾向は左図と同じ

②

①

20

30

40

50

60

70

80

90

35 40 45 50 55 60 65


Air F

low

Rate

[m

3/h]

Installation Water Depth2ｍ

②

①

Decrease in Load

Increasein Load

The motor will be overloadedif the valve is squeezed morethan this point.

The motor will be overloaded if the valve is squeezed more than this point.

The changing trend of the motor load is the same as left graph.

11

■ 7-2. Operation in combination with Blower This is an operation system that an aerator and a general purpose blower are operated in conjunction. The blower is installed at the end of air-inlet line of an aerator and gives pressure to the air. This enables us to install the aerator at a deeper position than the designed standard. For example, the aerator can be operated at the depth of 10 meters by means of the principle that the general purpose blower gives pressure to the air for 5 meters depth and the aerator sucks air for the 5 meters’ depth.

▼ 7-2-1. Comparison against Other Deep Aeration Methods (in case the tank depth is 10m)

Aeration

Equipment

Installation

Water

Depth h

[m]

Oxygen

Transfer

Efficiency

(Clean Water)

[%]

Pressure Loss

by Equipment

[kPa]

Remarks

(○: Merit, ☓: Demerit)

Components Used

(Summary)

Submersible

Aerator

(Tsurumi

“TRN” series,

self-aspiration

type)

10

26 to 53

(Estimated

value)

0

(because of the

self-aspiration

system)

○ High in the oxygen

transfer efficiency as

the aerator can

be installed at the bottom.

○ Possible to operate

with smaller powers

(See p.14 7-2-5).

○ Installation or maintenance

work can be performed

without draining the tank

○ High-durability due to the

original “air-seal”

structure and

the OIL LIFTER.

☓ One (1) blower must

be engaged to

one (1) aerator only.

See p.12 7-2-2

Equipment necessary for this Operation

Submersible

Aerator

(Draft Tube

type axial-flow

mixer)

5 20 to 30 2.6 to 4.5

○ Possible to reduce the

equipment quantity as high

in oxygen transfer rate.

○ Anaerobic treatment is

possible.

☓ Requiring the draft tube.

☓ Expensive in

piping equipment.

☓ Necessary to drain the

tank in its first installation.

Plate Diffuser

(Convection by

line aeration

method)

5 15 to 17

3.92

+ 0.29 to 0.78

(aging increase

in pressure loss)

☓ Requiring the guide plate.

☓ Expensive in

piping equipment.

☓ Necessary to drain

the tank in its first

installation and

maintenance.

✳ A general purpose blower is supposed to be applicable to use up to 60 kPa.

✳ The oxygen transfer efficiencies and the figure are quoted from “Guideline and Manual for Planning and Design in Sewerage Systems (2001)”.

✳ When selecting a blower, calculate the required pressure including the loss of pressure which is generated in the piping system.

Air- supply Pipe

Installation Water

Depth h

DraftTube

SubmersibleAerator

(Draft Tube type

axial-flowmixer)

Guide

Plate

Plate Diffuser

Air-supply Pipe

Installation Water

Depth h

12

▼ 7–2-2. Equipment necessary for this Operation

· The blower must be operated with a VFD (Never use direct-on-line starting to start the blower.). Operation with a VFD will be effective in energy saving.

· One (1) blower must be engaged to one (1) aerator only. This is because, the air is transferred to the deeper area of the tank by utilizing both the outlet pressure of the blower and the suction force of the aerator, and it is required to keep the balance between the two equipments. If the balance is disrupted, the aerator may idle (impeller runs in air) or may stop its operation by due to tripping of the motor protection device caused by an overloading reason. As a result of these conditions, the blower gets into the “closed-valve” operation, which can cause the danger of a breakdown of the blower by the reason of overload or abnormal pressure.

· Be sure to provide a non-return valve in the blower outlet piping. This is to prevent the treating liquid from flowing back to the blower when the blower stops. Back-flow of the treating liquid pressurizes the air in the piping, and this may cause the danger of a breakdown of the blower.

· Provide a pressure gauge, which indicates the outlet pressure of the blower. This is required for operation adjustments.

· When there is a need for the correct adjustment of air flow rate, provide a flow meter.

· For other precautions, follow the instructions specified in each design manual.

W.L

Non-return Valve Air-inlet Pipe

Submersible Aerator

Pressure Gauge

InstallationWater Depth h

Pressure depth coveredby the blower

Self-aspiration water depth d bythe submersible aerator (within themaximum installation water depthof each aerator)

Blower House

Blower (with VFD)

13

▼ 7-2-3. Operation

· Operation of the submersible aerator and the blower shall be controlled in such a manner that both equipment be started or stopped simultaneously.

· Regulate the acceleration time (VFD) to approximately 10 seconds, and secure the stable starts of these equipments. In case that the acceleration time is longer than this, the motor protection device of the aerator may trip to stall the aerator by due to overload, and as a result the blower may have the danger of breakdown due to overload or an abnormal pressure. In addition, the deceleration time (VFD) shall be regulated to the region between 15 to 20 seconds so that the non-return valve may not suffer an impact.

▼ 7-2-4. Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz)

Step 1. Prepare a clamp meter to measure the running current of the submersible aerator.

Step 2. Regulate the rotating speed of the blower with VFD, according to the “Initially Targeted Operating

Point of Blower” in the table of p.15 7-2-7.

✳ Do not carry out this adjusting work by solely operating the blower. In case that the aerator is not operating together, there may be the danger of breakdown of the blower by due to overload or abnormal pressure as the blower gets into the “closed-valve” condition.

Step 3. Start the submersible aerator and the blower simultaneously.

Step 4. Confirm that the running current of the submersible aerator is within the limit of “Operating Range of Aerator on Running Current” described in the table of p.15 7-2-7. If not, rotating speed of the blower so that the running current of the submersible aerator may fall within the operating range.

✳ Method to decrease the running current of submersible aerator; Increase the rotating speed of the blower. By this, the self-aspiration water depth d of the submersible aerator becomes shallower and the running current will be decreased.

✳ Method to increase the running current of submersible aerator; Decrease the rotating speed of the blower. By this, the self-aspiration water depth d of the submersible aerator becomes deeper and the running current will be increased.

✳ If the running current of the aerator plunges much lower than the “Operating Range of Aerator on Running Current”, it shows a symptom that the balance between the outlet pressure of the blower and the suction force of the aerator is disrupted, and that the aerator is not generating any suction force because it is idling. In this case, stop both of the blower and aerator immediately. If this condition continues, there will be the danger of breakdown of the blower by due to overload or an abnormal pressure as the blower gets into the “closed-valve” operation.

Step 5. Adjust the rotating speed of the blower with VFD in such a manner that the blower may discharge the targeted air flow rate at its required pressure in a graph of 7-2-11. “Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower – 50Hz)” on page 18.

✳ Note that, depending on the operating condition, the blower could discharge the targeted air flow rate at a pressure point lower than indicated in a graph of p.18 7-2-11. In this case, adjust the rotating speed of the blower assuming that it discharges maximum air flow rate on its graph at the point of minimum (running) current in the “Operating Range of Aerator on Running Current” in the table of p.15 7-2-7 and that it discharges minimum air flow rate on its graph at the point of maximum (running) current in the range.

14

▼ 7-2-5. Selection Procedure (Example)

▼ 7-2-6. Recommended Tank Dimensions (combination with blower) Blower Dimension of Sub-convection

Air-inlet Bore [mm]

Model Motor Output

[kW]


[m]

Discharge Pressure

[kPa]

Circular Tank

φa

[m]

Square Tank

a

[m]

6 24

8 44 50TRN42.2-52/62 2.2

9.6 60

6 5.5

6 20

8 40 50TRN43.7-52/62 3.7

10 60

7 6.5

6 20

8 40

50

50TRN45.5-52/62 5.5

10 60

9 8

6 20

8 40 80TRN47.5-52/62 7.5

10 60

10 9

6 20

8 40 80TRN412—52/62 12

10 60

12 11

6 20

8 40

80

80TRN417-52/62 17

10 60

13 11.5

6 20

8 40 100 100TRN424—52/62 24

10 60

14.5 13

6 20

8 40 150 150TRN440—52/62 40

10 60

17 15

✳ The above table shows the estimated values under the condition that the self-aspiration water depth d (installation depth h – Pressure depth covered by the blower) be 4 meters. The aerating depth of 2.2kW model is 3.6 meters. For other operating conditions, refer to p.18 7-2-11. “Discharge pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz)”, or p.19 7-2-12. “Discharge pressure of Blower vs. Air Flow Rate Curve (combination with blower - 60Hz)”.

✳ Discharge pressures in above do not include the pressure loss in the piping. It is required to calculate and add it to the above value when selecting the blower.

✳ It is recommended that a haunch be provided between each sidewall and the bottom of the tank so as to maintain the mixing efficiency.

✳ Only the above models are applicable to the combined use of an aerator and a blower.

✳ Refer to “4-1. Typical Convection Pattern” and “4-2. Shape of Aeration Tanks” on page 4 for explanations on the tank shape and the dimension.

Condition - Water Depth of 10m, Required Oxygen Transfer Rate of 16.5kgO2/h (clean water), 200V, 50Hz

In case of Submersible Aerator + General purpose Blower

Providing a safety factor of 10% for the required oxygen transfer rate, the required oxygen transfer rate shall be

18.2kgO2/h.

Refer to p.16 7-2-9. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz), and Model80TRN47.5-52 (7.5kW) can be selected. The required air flow rate shall be 180m3/h.

Refer to p.18 7-2-11. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz,estimate). When the air flow rate required is 180m3/h (3.00m3/min), the required discharge pressure shall be0.053MPa (53kPa).

In case that a margin of 5kPa is added to the discharge pressure of the blower (considering the pressure loss inthe pipe and a margin), the blower should have a duty of 53 + 5 = 58 kPa.

Required air flow rate shall be 3.15m3/min. including 5% allowance. Model RSR-80 (1370min–1, 3.20m3/min, at58.8kPa, 5.01kW) can be selected,

The total required power is 〔7.5 + 5.01 = 12.51kW〕

15

▼ 7-2-7. Initially Targeted Operating Point of Blower and Operating Range of Aerator on Running Current (combination with blower - 50Hz)

● 50Hz Initially Targeted Operating Point of Blower

Operating Range of Aerator on Running Current


Installation Water

Depth h [m]

Discharge Pressureof Blower

[kPa]

Inlet Air Flow Rateof Blower [m3/min]

(200V)

[A]

(400V)

[A]

6 24 0.77

8 44 0.87 50TRN42.2-52 2.2

9.6 60 1.12

9.0 to 10.5 4.5 to 5.3

6 20 1.05

8 40 1.18 50TRN43.7-52 3.7

10 60 1.50

13.5 to 17.2 7.0 to 8.6

6 20 1.50

8 40 1.68 50TRN45.5-52 5.5

10 60 2.2

20.0 to 24.3 10.0 to 12.1

6 15 2.3

8 35 2.6 80TRN47.5-52 7.5

10 55 3.1

23.5 to 31.8 12.0 to 15.9

6 10 3.2

8 30 3.6 80TRN412-52 12

10 50 4.5

36.0 to 51.4 18.0 to 25.7

6 10 4.0

8 30 4.5 80TRN417-52 17

10 50 5.4

51.0 to 70.3 26.0 to 35.2

6 10 7.1

8 30 8.0 100TRN424-52 24

10 50 9.3

78 to 96 39 to 48

6 10 9.6

8 30 10.8 150TRN440-52 40

10 50 12.8

134 to 165 67 to 83

▼ 7-2-8. Initially Targeted Operating Point of Blower and

Operating Range of Aerator on Running Current (combination with blower – 60Hz)

● 60Hz Initially Targeted Operating Point of Blower

Operating Range of Aerator on Running Current


Installation Water

Depth h [m]

Discharge Pressureof Blower

[kPa]

Inlet Air Flow Rateof Blower [m3/min]

(200V)

[A]

(400V)

[A]

6 24 0.76

8 44 0.85 50TRN42.2-62 2.2

9.6 60 1.00

8.0 to 9.5 4.0 to 4.8

6 20 1.13

8 40 1.30 50TRN43.7-62 3.7

10 60 1.58

12.5 to 16.0 6.5 to 8.0

6 20 1.50

8 40 1.70 50TRN45.5-62 5.5

10 60 2.1

17.5 to 22.6 9.0 to 11.3

6 15 2.1

8 35 2.3 80TRN47.5-62 7.5

10 55 2.7

23.0 to 29.6 11.5 to 15.0

6 10 3.3

8 30 3.7 80TRN412-62 12

10 50 4.3

34.0 to 47.6 17.0 to 23.8

6 10 4.1

8 30 4.6 80TRN417-62 17

10 50 5.4

44.0 to 66.3 22.0 to 33.2

6 10 7.1

8 30 7.4 100TRN424-62 24

10 50 8.4

80 to 96 40 to 48

6 10 9.8

8 30 11.1 150TRN440-62 40

10 50 13.0

145 to 165 73 to 83

✳ The above tables are those that are to be utilized in p.13 7-2-4. “Adjusting Procedure for Air Flow Rate (e.g. 200V, 50Hz)”.

✳ To adjust the air flow rate of the blower initially, set the VFD to regulate the blower speed to perform “Initially Targeted Operating Point of Blower”.

✳ For the operation in combination with a blower, adjust the rotating speed of the blower so that the running current of the submersible aerator may fall within the “Operating Range of Aerator” stated above. If the running current of the aerator goes beyond its range, the balance between the outlet pressure of the blower and the suction force of the aerator will be disrupted, and the aerator will idle (impeller runs in air) or will stop its operation by due to tripping of the motor protection device caused by an overloading reason. As a result of these conditions, the blower gets into the “closed-valve” operation, which can cause the danger of breakdown of the blower by the reason of overload or abnormal pressure.

16

▼ 7-2-9. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 50Hz)

* Calculated from 6-1 and 7-2-11 ● Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection.

2

3

4

5

6

7

8

9

20 30 40 50 60 70 80

Air Flow Rate ［m3/h］

Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 50TRN42.2-52

6m

8m InstallationDepth9 .6m

10

15

20

25

30

150 200 250 300 350


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

80TRN412-52

8m

6m

InstallationDepth10m

2

4

6

8

10

12

14

16

20 40 60 80 100 120 140


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 50TRN43.7-52

6m

8m


10

15

20

25

30

35

40

200 250 300 350 400 450


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 80TRN417-52

6m

8m


4

6

8

10

12

14

16

18

20

60 80 100 120 140 160 180


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 50TRN45.5-52

6m

8m


10

20

30

40

50

60

300 400 500 600 700


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

6m

8m

100TRN424-52


6

8

10

12

14

16

18

20

22

100 120 140 160 180 200 220 240


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 80TRN47.5-52

8m

6m


10

20

30

40

50

60

70

80

500 600 700 800 900 1000

Air Flow Rate［m3/h］

Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］ 150TRN440-52

6m

8m InstallationDepth10m

17

▼ 7-2-10. Oxygen Transfer Rate vs. Air Flow Rate Curve (combination with blower - 60Hz)

* Calculated from 6-1 and 7-2-11 ● Data on this page are for reference only. It is suggested that a certain safety margin be added in your selection.

2

3

4

5

6

7

8

9

20 30 40 50 60 70 80


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h

］

50TRN42.2-62

6m

8m

InstallationDepth9.6m

10

15

20

25

30

150 200 250 300 350


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

80TRN412-62

8m

6m


2

4

6

8

10

12

14

16

20 40 60 80 100 120 140


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

50TRN43.7-62

6m


4

6

8

10

12

14

16

18

20

60 80 100 120 140 160 180


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

50TRN45.5-62

6m

8mInstallation

Depth10m

6

8

10

12

14

16

18

20

22

100 120 140 160 180 200 220 240


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

80TRN47.5-52

8m

6m


10

20

30

40

50

60

70

80

500 600 700 800 900 1000


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

150TRN440-62

6m


10

15

20

25

30

35

40

200 250 300 350 400 45


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

80TRN417-62

6m


10

20

30

40

50

60

300 400 500 600 700


Oxy

gen T

ransf

er

Rat

e ［

kgO

2/h］

6m

8m

100TRN424-62


18

▼ 7-2-11. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 50Hz) Estimated Air Flow Rate at the Standard Condition (20oC, 1atm)

50TRN42.2-52 and 50TRN43.7-52

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

0 0.02 0.04 0.06 0.08

Discharge Pressure of Blower [MPa]

Air F

low

Rate

[m

3/h]

50TRN43.7-52

50TRN42.2-52

InstallationDepth

6m

8m

8m

10m

9.6m

InstallationDepth

6m

80TRN412-52 and 80TRN417-52

160

180

200

220

240

260

280

300

320

340

360

380

400

420

0 0.02 0.04 0.06 0.08


Air F

low

Rat

e [

m3/h

]

10m

8m

80TRN417-52

80TRN412-52

InstallationDepth

6m

8m

10m

InstallationDepth

6m

50TRN45.5-52 and 80TRN47.5-52

60

80

100

120

140

160

180

200

220

240

0 0.02 0.04 0.06 0.08


Air F

low

Rate

[m

3/h

]

10m

8m

InstallationDepth

6m

80TRN47.5-52

8m

10m

InstallationDepth

6m

50TRN45.5-52

100TRN424-52 and 150TRN440-52

300

350

400

450

500

550

600

650

700

750

800

850

900

950

1000

0 0.02 0.04 0.06 0.08


Air F

low

Rat

e [

m3/h

]

10m

8mInstallation

Depth6m

100TRN424-52

150TRN440-52

8m

10m

InstallationDepth

6m

19

▼ 7-2-12. Discharge Pressure of Blower vs. Air Flow Rate Curve (combination with blower - 60Hz) Estimated Air Flow Rate at the Standard Condition (20oC, 1atm)

50TRN42.2-62 and 50TRN43.7-62

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

0 0.02 0.04 0.06 0.08


Air F

low

Rate

[m

3/h]

50TRN42.2-62

50TRN43.7-62

InstallationDepth

6m

8m

8m

10m

9.6m

InstallationDepth

6m

80TRN412-62 and 80TRN417-62

160

180

200

220

240

260

280

300

320

340

360

380

400

420

0 0.02 0.04 0.06 0.08

Dicharge Pressure of Blower [MPa]

Air F

low

Rate

[m

3/h]

10m

8m

80TRN412-62

80TRN417-62

InstallationDepth

6m

8m

10m

InstallationDepth

6m

50TRN45.5-62 and 80TRN47.5-62

60

80

100

120

140

160

180

200

220

240

0 0.02 0.04 0.06 0.08


Air F

low

Rate

[m

3/h

] 80TRN47.5-62

InstallationDepth

6m

8m

8m

10m

10m

InstallationDepth

6m

50TRN45.5-62

100TRN424-62 and 150TRN440-62

300

350

400

450

500

550

600

650

700

750

800

850

900

950

1000

0 0.02 0.04 0.06 0.08

Discarge Pressure of Blower [MPa]

Air F

low

Rate

[m

3/h]

10m

8m

100TRN424-62

150TRN440-62

InstallationDepth

6m

8m

10m

InstallationDepth

6m

20

8. About Noise Suction noise will be generated at the suction silencer while the gas to be handled is being sucked by the submersible aerator. “8-2. Measured Sound Pressure Level Data” shows the sound pressure level of each aerator. Note that these sound pressure level data are those measured at an indoor test facility in our factory and are not the guaranteed figures that are expected at your site. Also note that the sound pressure level may vary depending on various factors like piping condition.

■ 8-1. Measured Point and Condition

■ 8-2. Measured Sound Pressure Level Data

1m from the

Silencer The Inside of the Factory Structure

Air-inlet Bore [mm]

Model Motor Output

[kW]


[m]

A-weighted

Sound Pressure

Level [dB(A)]

Back Ground

Noise Level

[dB(A)]

1.5 53 32TRN2.75 0.75

3.5 54 43

1.5 53 32

32TRN21.5 1.5 3.5 58

43

2.5 61 50TRN42.2 2.2

3.6 61 43

2 66 50TRN43.7 3.7

4 70 43

2 69

50

50TRN45.5 5.5 4 70

43

2 71 80TRN47.5 7.5

4.5 68 42

3 72 80TRN412 12

6 73 42

3 74

80

80TRN417 17 6 72

45

4.5 73 100 100TRN424 24 6 74

45

3.5 70 150 150TRN440 40 6 74

49

✳ Measurements of the sound pressure level have been carried out in accordance with JIS B 8346-1991, “Fans, Blowers and Compressors - Determination of A-weighted Sound Pressure Level”.

✳ The equipment used for the measurement was a standard sound level meter that complies with JIS C 1502.

✳ Frequency correction “A” and “SLOW” time weighting were used for the sound level meter.

✳ The sound pressure level data are those that have been calculated from the average sound pressure levels measured atfour (4) points, all of which are located at the same height of 1.6m from the floor but are equally distributed to four-way to the distance of 1m away from the silencer.

W.L

Silencer Sound Level Meter

Factory Structure

SubmersibleAerator

Air-inlet Piping (PVC Flexible Hose, 10m)

1m

1.6

m

Equipment Selection Guide

Dewatering pump range also available … contact Pump Solutions Australasia for more details

Type Model Bore mm Motor Output kW Feature

Sewage/waste

water pumps

B 50-800 0.4-110 Basic sewage pump

BZ 80-100 1.5-15 Basic sewage pump with large solid passage

C 50-100 0.75-15 Basic sewage pump with cutter mechanism

U 40-80 0.25-3.7 Vortex sewage pump with 2 pole motor

UZ 50-100 1.5-11 Vortex sewage pump with large solid passage

UT 50 0.4 Vortex sewage pump with single phase motor

PU 40-80 0.15-1.5 Vortex sewage pump - resin

PN 40-50 0.25-1.5 Semi-vortex wastewater pump - resin

MG 32-50 1-3.7 High head grinder pump

Corrosion

resistant

BQ 50-100 0.4-3.7 Cast ss version of B series

CQ 50-100 0.75-3.7 Cast ss version of C series

Explosion proof

BX 80-100 1.6-3.8 Explosion proof version of B series

CX 80-100 1.6-3.8 Explosion proof version of C series

UX 50-80 1.6-4 Explosion proof version of U series

Effluent

Pumps

PSF 40-50 0.25-1.5 High head effluent pump - resin

SF 50-80 0.75-11 Semi-open impeller, for high head pumping

OM 32 0.15 Semi-vortex effluent pump - resin

Corrosion

resistant

SQ 40-50 0.25-0.75 Lightweight ss effluent pump

SFQ 50-80 0.4-11 Chemical effluent pump - cast ss

TM 40-50 0.25-0.75 Seawater pump - titanium & resin

Water

Treatment

Equipment

Blower RS 20-150 0.4-45 Rotary air blower

Aerator TRN 32-150 0.75-40 Submersible self aspirating aerator

BER 25-50 0.75-5.5 Submersible axial-flow type aerator

Skimmer FSP 50 0.4-0.75 Floating scum skimmer

Decanting pump FHP 40-80 0.25-1.5 Float type decanting pump

Bar Screen KE/KS - - Automatic mechanical bar screen (front)

KM/KMA - - Automatic mechanical bar screen (rear)

WASTE WATER TREATMENT SELECTION GUIDE · Cited Reference: “Guideline and Manual for Planning and...

Documents

Transcript of WASTE WATER TREATMENT SELECTION GUIDE · Cited Reference: “Guideline and Manual for Planning and...