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Transcript of Process Design Calculation3- ND
7/23/2019 Process Design Calculation3- ND
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 1 Of 14
1 Design Considerations
Desired Output Q(out) 250000.00 m /day
Internal loss after considering
recovery IL @ 3 % 7500.00 m3/day
Raw water Input Q(in) = Q(out) + IL 257500.00 m /day
Working Hours t 22.00 Hours/day
Average Flow Rate (Normal) Q(avg) 11704.55 m /Hour
Overload flow for hydraulic design
of inlet works 30.00 %
Overload flow for hydraulic design
rest of the plant 25.00 %
Inlet Works Average Flow Rate 11704.55 m3
/hour Inlet Works Average Flow Rate
(Overload) Q(OL) 30 % over nornmal flow 15215.91 m3/hour
n et wor s verage ow ate
(Normal) Q(avg) 3.25 m3/Sec
Inlet works Average Flow Rate
(Overload) Q(OL) 30 % over nornmal flow 4.23 m3/Sec
2 Treatment Plant Units
2.1 Inlet Chamber
Design Nominal Flow 300000.00 m3/day
Desigin input flow 309000.00 m3/day
Inlet Works Average Flow Rate 14045.45 m3/hour n et or s verage ow ate
(Overload) Q(OL) 30 % over nornmal flow 18259.09 m3/hour
Inlet works Average Flow Rate
(Normal) Q(avg) 3.90 m3/Sec
n et wor s verage ow ate
(Overload) Q(OL) 30 % over nornmal flow 5.07 m3/Sec
Design flow Present normal 3.25 m3/Sec
No of units N 1.00 No
Hydraulic Retention Time HRT 60.00 Sec @ avg flow
Volume V = Q(avg) X HRT 234.09 m
Depth D 5.15 m
Area A = V/ D 45.45 m2
Diameter 7.61 m
Check for HRT at Design Ultimate
Overload Condition 46.15 Sec
Dimensions Adopted
Diameter 7.61 m
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 2 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Depth 5.15 m
Free Board 0.50 m
Construction RCC
Protection Food Grade Epoxy on all internal
2.3 Inlet Channel
No of Units N 1.00 No
Design Flow Normal Ultimate 250 + 50 MLD 3.90 m3/Sec
Design Flow Overload Ultimate 5.07 m3/Sec
Design flow Present normal Q(avg) 3.25 m /Sec
Flow present Overload Q(OL) 4.23 m /Sec
Velocity V 0.80 m/sec
rea requre or t mate ormacondition A= Q(Uliti_avg)/V 4.88 m2
Width W 2.50 m
Depth D 1.95 m
Check for Velocity at Ultimate
overload condition 1.04 m/sec
Check for Velocity at present
overload condition 0.87 m/sec
Dimensions Adopted
Length 5.00 m
Width 2.50 m
Liquid Depth 1.95 m
FB 0.50 m
2.4 Parshall Flume
Approach Channel Width W 2.50 m
Design flow Max Q(OL) 5.07 m /Sec
Design flow min Q(avg) 3.25 m /Sec
Throat Width 1.5 m
Head at max. flow condition Q = 2.264WH3/2
1.307 m
Head at min. flow condition 0.971 m
Headd Loss at Max Flow 0.784 m
Head Loss at Min flow 0.583 m
Water Level D/s of Flume at Max Flow 0.523 m
Water Depth at D/s of Flume at Min Flow 0.261 m
2.5 Distribution Box
No of Inlet 1 No
No of Outlet 6 No
HRT in the inlet box 60 Sec
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 3 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Inflow 3.90 m3/Sec
Vol 234.09 m
3
Weir length for distribution 5.00 m
Maximum Flow through each weir 0.85 m3/Sec
Rise Over Weir 0.2 m
No of Outlet on one side 3 No
Length of Distribution Box 15 m
Depth 3.5 m
Area 66.88 m2
Width 4.46
2.4 Flash Mixer
No of Units N 6.00 m
Flow (avg)Q
(avg) 3.90m /sec
Flow through each unit Q(unit)=Q(avg)/N 0.65 m /Sec
HRT t 60.00 sec
Volume of each tank V 39.02 m3
Liquid depth 3.25 m
Area of cross section A 12.00 m2
Length L 3.46 m
Width W 3.46 m
Dimensions Adopted
Length 3.50 m
Width 3.50 m
Liquid Depth 3.25 mFree Board 0.50 m
Tank Volume 39.81 m3
Construction RCC
2.5 Pipe Connection From Flash Mixer to Flocculation Cum Settling Tank
No of Connections 6.00 No
Flow Normal Q(avg) 3.90 m /Sec
Flow Overload 5.07 m3/Sec
Velocity 0.90 m/sec
Area required for overload condition 0.94 m2
Diameter of Pipe 1.09 m
Pipe Size Provided 1000.00 mmCheck Velocity for Overload condition
2.6 Flocculation cum settling Tank (Conventional Design)
No Of Units N 6 All Working
Design Flow Q(avg) 309000.00 m /day
Flow through each tank (Avg) 51500.00 m3/day
Inner diameter of Central Coloum 1.00 m
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 4 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Outer Dia of Central Coloum 1.30 m
HRT in flocculation tank 25.00 min
Volume of flocculation Zone 894.10 m3/day
Add for Vol occupied by central coloum 3.98 m3/day
Corrected Volume of Flocculation Zone 898.08 m3
Depth of flocculation Zone 3.00 m
Area of flocculation Zone 299.36 m2
Inner Diameter of Flocculation Zone 19.53 m
Outer Diameter of Flocculation Zone 19.93 m
Outer surface Area of Flocculation Zone 311.75 m2
Surface Loading Rate in clarifier 35.00 m /m /day
Surface Area Required 1783.18 m2
Diameter Of Unit 47.66 m
Detention Time HRT 2.50 Hours at Avg flow
Volume Required 5364.58 m3
Depth required SWD= V / SA 3.01 m
Domensions Adopted
Flocculation Zone
Diameter 19.53 m
Depth 3.00 m
Overall Clarifier & Flocculator
Diameter 48.00 m
SWD 3.01 m
FB 0.50 m
Check for Weir loading
Length of weir 150.72 m
Loading 341.69 m3/m/day
Launder Dimensions
Flow 0.33 m3/Sec
Velocity 0.90 m/sec
Area 0.36 m2
Depth 0.50 M
Width 0.72 M
2.7 Sludge Outlets from Clariflocculator
No of Connections 6.00 No
Discharge Volume 7725.00 m3/day
Discharge Volume /outlet 1287.50 m3/day
Discharge Duration 150.00 Min
Flow rate 0.14 m3/Sec
Velocity 1.50 m/sec
Area required 0.10 m2
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 5 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Diameter of Pipe 0.35 m
Pipe Size Provided 350.00 mm
2.8 Telescopic Device for constant discharge
Diameter 250.00 mm
2.1 Channel from clarifloccultor to Common Channel
No of Units 2.00 No
Flow Normal Q(avg) 1.95 m /Sec
Flow Overload 2.44 m3/Sec
Velocity 1.00 m/sec
Area required for overload condition 2.44 m2
Width 1.60 m
Depth 1.52 m
2.11 Filter Inlet Channel
No of Units 2.00 No
Flow Normal 1.95 m3/Sec
Flow Overload 2.34 m3/Sec
Velocity 1.00 m/sec
Area required for overload condition 1.17 m2
Width 0.60 m
Depth 1.95 m
2.12 Filtration units
No of Filter House 1 Building
Flow to Each 14045 m3/hour
No of Total Filter Box 24 m
No of Working Unit at a time 22 m
Working time for each filter WT 22.00 Hours
Design Flow (Average) Q(desavg) = Q(avg)/22 14045.45 m3/hour
Design Flow Per Filter (avg) q(avg) = Q(desavg)/ No of Filter 638.43 m3/hour
Filtration Rate FR 7.50 m3/m
2/day
Area required FA 85.12 m2
L/B 1.50 mshort side of filter Width 7.53 m
Long Side Length 11.30 m
Washwater Gutter width 0.90 m
Flow when one filter is out 668.83 m3/hour
Filtration rate 7.86 m3/m
2/day
Overall fil ter house diamnsions
Width 8.43 m
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 6 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Length 11.30 m
Ht 3.50 m
Two Filter Houses, each having Two rows of Eight fil ters each and midd le operating gallery consi
Dimensions of Filter House
No of Filters in each filt er house 24.00 No
Over all length 107.40 m
Overall Wid th 33.30 m
Operating gallery 7.50 m
2.13 Sizes of the Ports
a Filter Inlet
No of Working Inlets 22.00 No
Flow Normal 0.18 m3/Sec
Flow Overload 0.21 m3/Sec
Velocity 1.00 m/sec
Area required for overload condition 0.21 m2
Diameter of Pipe 0.52 m
Inlet Size Provided 500 mm
b Filter Water Outlet
No of Working Outlets 22.00 No
Flow Normal 0.18 m3/Sec
Flow Overload 0.21 m3/Sec
Velocity 1.00 m/sec
Area required for overload condition 0.21 m2
Diameter of Opening 0.52 m
Inlet Size Provided 500.00 mm
c Back Wash Water Inlet
Back Wash Rate 30.00 m3/m
2/hour
Area of Filter Bed 85.12 m2
No of Inlets in each Filter 1.00 m
Wash Water Flow through each inlet 2553.72 m3/hour
Wash Water Flow through each inlet 0.71 m3/Sec
Velocity 2.50 m/sec
Area required 0.28 Sq. M
Diameter of Pipe 0.60 m
Inlet Size Provided 600.00 mm
d Wash Water Outlet
No of Outlets 1.00 No
Flow Normal 0.71 m3/Sec
Velocity 2.50 m/sec
Area required 0.28 m2
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 7 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Diameter of Opening 0.60 m
Outlet Size Provided 600.00 mm
2.14 Filter Outlet Channel
No of Units 1.00 No
Flow Normal 14045.45 m3/hour
Flow Overload 16854.55 m3/hour
Flow 4.68 m3/Sec
Velocity 1.00 m/sec
Area required for overload condition 4.68 m2
Width 2.00 m
Depth 2.34 m
FB 0.30 m
2.15 Washwater Outlet Channel
No of Units 1.00 No
Flow Normal 0.71 m3/hour
Velocity 1.00 m/sec
Area required for overload condition 0.71 m2
Width 0.80 m
Depth 0.89 m
Free Board 0.50 m
2.16 Pipe Connection from Filter Outlet Channel to CCT (Alternative to Channel)
No of Pipes 1.00 No
Flow Normal Q(avg) 3.90 m /Sec
Flow Overload 4.88 m3/Sec
Velocity 1.20 m/sec
Area required for overload condition 4.06 m2
Dimeter of pipe 2.28 m
Provide 2200.00 mm
2.17 Chlorine Contact Tank
No of Units N 1 No
Compartments n 4 No
Design Flow Q(avg) 14045.45 m /hour
HRT T 20.00 mVolume V=(Q/60) X HRT 4681.82 cu.m
Depth D 4.00 m
Surface Area A = V/D 1170.45 m2
Width 42.00 m
Partition Wall Thickness Wt 0.25 m
No of walls NWALLS 3.00 No
Corrected Width W = A 43.00 m
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 8 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Length 27.87 m
Free Board 0.50 m
Overall Height 4.50 m
Size of Each Compartment
Width 9.75 m
Length 27.87 m
Dimensions Adopted
No of Compartments 4.00 No
Width 9.75 m
Length 27.87 m
Liquid Depth 4.00 m
Free Board 0.50 m
Construction RCC
3 Equipment3.1 Filter backwash Pumps
Back wash Water requirement
Backwash rate 25.00 m3/m
2/hour
Backwash Flow 2128.10 m3/hour
Backwash Duration 10.00 Min
Water Consumed /back wash 354.68 m3
No of Back wash /hour 1.00 Provision
Overhead Tank Capacity 354.68 m3
No of Tank 1.00 No
Capacity of Each 354.68 m3
Provide 465.00 m3
Punps for filling backwash Tank 2.00 No
Working 1.00 No
Standby 1.00 No
Pump Capacity 930.00 m3/hour
Head 15.00 m
3.2 Air Blowers
No of Units/filter House 3.00 No
No of Working units 2.00 No
Total No 3.00 Two Working
Air Scour Rate Air rate 55.00 m3/m
2/hour
Area of filter A 85.12 m2
Air Requirement Airqty =Air Rate x Area 4681.82 m3/hour
discharge head 4.50 MWC
Capacity of each blower to be provide 2340.91 m3/hour
3.3 Chlorinators for pre chlorinations
Chlorine Dose = 2 mg/l
Flow = 14045.5 m3/h
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 9 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Maximum Chlorine Dosing rate = 28.1 kg/h
Cosider capacity of each
chlorinator as = 30.00 kg/h
So No of units,
Working = 1.0 No
standby = 1.0 No
Maximum withdrawal capacity of
each tonner = kg/h
Tonner for each Chorinator = 2 No
Total tonners required including
standby = 4 NoTotal tonners required
including standby with
changeover = 8.00 No
3.4 Chlorinators for post chlorinations
Chlorine Dose = 2 mg/l
Flow = 14045.5 m3/h
Maximum Chlorine Dosing rate = 28.1 kg/hCosider capacity of each
chlorinator as = 15.00 kg/h
So No of units,
Working = 2 No
(Cosidering 50 % standby) = 1 No
Maximum withdrawal capacity of
each tonner = kg/h
Tonner for each Chorinator = 2 NoTotal tonners required including
standby = 6 NoTotal tonners required
including standby with
changeover = 12.00 No
3.5 Chlorinators fo r Water Recovery and Recycling
Chlorine Dose = 5.0 mg/l
Flow = 625.0 m3/h
Maximum Chlorine Dosing rate = 3.1 kg/h
Cosider capacity of each
chlorinator as = 4.0 kg/h
So No of units,
Working = 1 No
standby = 1 No
Maximum withdrawal capacity of
each tonner = 4 kg/h
Tonner for each Chorinator = 1 nos
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 10 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main UnitsTotal tonners required including
standby = 2 No
Maximum withdrawal capacity of
each tonner = 7 kg/h
Tonner for each Chorinator = 1 nosTotal tonners required including
standby = 2
3.6 Total chlorine requirement
Total chlorine requirement = 59.3 kg/h
= 1423.4 kg/d
Capacity per cylinder = 900 kg
Nos. of cylinders = 1.6 per day
Nos. of cylinders = 33 per 21 days
4 Chlorine Drum Store And Chlorinator Room
4.1 Store
No of Drums Connected for Pre Chlorination 4.00 No
No of Drums Connected for Post Chlorination 4.00 No
No of Drums Connected for Dirty backwash treatment 2.00 No
Extra Filled Drum 13.00 No
Extra Empty Drum 9.00 No
Total Drums 32.00 No
Provide space for 36.00 No
No of Rows 9.00 No
Width 15.36 m
Length 15.78 m
4.2 Chlorinator Room
Width 15.78 m
Length 7.00 m
4.3 Drum Pit
Length 2.00 m
Width 2.00 m
Depth 2.00 m
5 Dirty Backwash Water Recovery System
5.1 Sump for clariflocculator Sludge
Wastewater from clarifier 7725.00 m3/day
Discharge frequency 3.00 Hours
No of discharges 8.00 per day
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 11 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Duration of each discharge 10.00 Min
Total discharge time 80.00 min
Flow rate 1.61 m3/Sec
Retention time in collection tank 1.00 discharge
Volume of the tank 965.63 m3
Depth of tank 3.00 m
Area 321.88 m2
Length 25.37 m
Width 12.69 m
5.2 Thickener for clariflocculator Sludge
Plant Capacity 309000.00 Cu. M. /day
Flow for Phase 1 14045.45 Cu. M. /hr
SS Concentration in raw effluent 15.00 mg/l
Total Solid Load because of SS 5056.36 kg/day
Alum Consumption as Al2O3 772.50 kg/day
Sludge Formed 1605.59 kg/day
Total Solid Load 6661.95 kg/day
Solid separated in clariflocculator 99.00 %
Solids going to thickener 6328.85 Kg/day
Design Flow Rate for Thickener 321.88 Cu. M. /hr
Solid Loading Rate 40.00 kg/m2/day
Surface Loading Rate 40.00 m3/m
2/day
Area required for Soild Loading Criteria 158.22 m2
Area required for Surface Loading Criteria 193.13 m
2
Adopted Area 193.13 m2
Diameter 15.68 m
Outlet Sludge Conc 5.00 %
Thickened Sludge Volume 154.50 m3/day
5.3 Sump for filter backwash
Filter Back wash 0.71 m3/Sec
Duration 10.00 Min
Total Flow 425.62 m3
Back wash Flow for 2 filter 851.24 m3
Volume required 851.24 m3
Depth 3.20 m
Area 266.01 m3/hour
Width 23.06 m
Length 11.53 m
Dimensions Adopted
Length 25.37 m
Width 12.69 m
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Consultancy for New WTP, Recycling Plant Augmentation and Automation of Existing WTP at Wadgaon, Pune
STC 12 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
F. B. 0.50 m
5.4 Clarifier for Filter Backwash recycling
Flow 425.62 Cu.M/hour
10214.88 Cu. M/day
Surface Loading Rate 100.00 kg/m2/day
Area required 102.15 m2
Diameter 11.41 m
SWD 2.00 m
Pipe Size from Dirty Back wash Transfer Pumps to Clarifier
Flow 425.62 m3/Sec
Velocity 1.50 m/sec
Area required 283.75 m2
Diameter of Header Pipe 19.01 m
Provide Pipe dia 500.00 MM
5.5 Sludge Drying Beds
Volume of Thickened Sludge 154.50 m3/day
Drying Cycle 15.00 Days
Volume for 11 days 2317.50 m3
Application depth 0.80 m
Area required 2896.88 m2
No of beds 14.00
Area of each 206.92 m2
Length 17.00
12.17
Dimensions adopted
Langth 17.00 m
Width 12.00 m
Depth 1.70 m
6 Calculations for Chemical Dosing
6.1 Dosing Tanks
Design Flow Normal Ultimate 250+50MLD+losses 9 MLD 309.00 MLD
309000.00 m3/day
Dose of Aluminium Sulphate as Al2O3 (Average) 2.50 mg/l
Cosumption As Al2O3 772.5 Kg/day
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STC 13 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Al2O3 Contents in commercial product 17.0 %
Quantity of commercial product required 4544.1 Kg/day Alum Consumption 206.55 Kg/hour
Solution Tank Capacity 8.00 Hours
Cosumptiion of Alum in 8 hours 1652.41 Kg
Solution Strength 5 % W/V
Solution Volume for 8 hours 33048.13 lit
No of Working Tanks 1 No
Volume of Each 33.05 Cu. M
No of Standby tank 2 No
Volume of Each 33.05 m3
Depth 2.50 m
Area Required 13.22 m2
Width 3.64 m
Langth 3.64 m
Dimension Adopted
Length 3.64 mwidth 3.64 m
Depth 2.50 m
FB 0.50 m
6.2 Space Requirement For storing Alum
Flow 309000.0 m3/day
Dose of Aluminium Sulphate as Al2O3 (Average) 2.5 PPM
Cosumption As Al2O
3772.5 Kg/day
Al2O3 Contents in commercial product 17.0 %
Quantity of commercial product required 4544.1 Kg/day
For 45 days 204485.3 kg
Wt of brick 20.0 Kg
No of Bricks 10224.3 No
Vol of Brick 0.0 m3
Volume Required 184.0 m3
Ht of Stack 1.8 m
Area required 102.2 m2
Acess Area 25.0 %
Area required 127.8 m2
Void space 15.0 %Correct Area for Void Space 147.0 m
2
Provide 150.0 m2
Calculation For PAC
6.3 PAC
Calculation for Storage
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STC 14 Of 14
Nagaur Lif t Water Supply Project
250 MLD CAPACITY WTP AT NOKHA DAIYYA (300 MLD Ult imate)
Design Calculations for Main Units
Treatment plant capacity (ultimate) 309000.00 m3/day
Dose of PAC as Al2O3 (Average)2.50 mg/l
Cosumption As Al2O3 772.50 Kg/day
Al2O3 Contents in commercial product 9.00 %
Consumption in terms of commercial product 8583.33 Kg/day
Spcific Gavity of Solution 1.21Cosumption of commercial product on volumetric basis 7093.66 Lit/day
45 Days requirement 319214.88 Lits
319.21 m3
No of Storage Tanks 2.00
Volume of Each Tank 159.61 m3
Tank Dimensions
Depth 2.50 M
Area 63.84
Length 7.99
Width 7.99
6.4 Alternate Design with HDPE Tank
Capacity of Tanks 20000.00 Lit
No of Tanks required 15.96
Provide 16.00 Tanks
6.5 Dosing Solution Tank
Daily Consumption 7093.66 Lit/day
No of working Tanks 1.00No of Standby Tank 2.00
Volume of Each Tank 7093.66 Lit
Say 7500.00 Lit
Depth 1.50 M
Area 5.00 m
Length 2.24 m
Width 2.24
Dimension Adopted
Length 2.24 mwidth 2.24 m
Depth 1.50 mFB 0.50 m