Activated Sludge Design Startup Operation Monitoring
-
Upload
nguyen-phuc-pham -
Category
Documents
-
view
254 -
download
0
Transcript of Activated Sludge Design Startup Operation Monitoring
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
1/52
Activated Sludge Design, Startup, Operation, Monitoringand Troubleshooting
Ohio Water Environment Association Plant Operations Workshop Columbus, Ohio
September 1, 2010
Phil Anderson Operations Specialist
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
2/52
Design - Activated Sludge Design Team Treatment Goals Activated Sludge Processes Engineering Standards
Preliminary Treatment Tertiary Treatment
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
3/52
Treatment Goals BOD Removal
Dissolved wastes are consumed as food by theactivated sludge microbes and converted to biomass,water, carbon dioxide, and other gases
Nitrification The process through which ammonia is oxidized tonitrite and nitrate
Denitrification
A process by which nitrates and nitrites are convertedto gaseous end products, primarily nitrogen gas.
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
4/52
Activated Sludge Processes
Conventional CBOD Removal Plug or Step Feed
Single-Stage NitrificationOxidation Ditch - Vertical LoopReactor Extended AerationMBR
BNR
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
5/52
Additional Processes Preliminary Treatment
Screening
Grit Removal Tertiary Treatment
Filters Solids Handling Recycle Flows
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
6/52
Design EngineeringStandards
Design of Municipal WastewaterTreatment Plants WEF Manual of
Practice No. 8
Wastewater Engineering, Treatment ,Disposal, ReuseMetcalf & Eddy
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
7/52
Design Engineering Standards
Recommended Standards for Wastewater Facilities
Policies for the Design, Review, and Approval of Plans andSpecifications for Wastewater Collection and Treatment
Facilities
MEMBER STATES AND PROVINCEIllinois Indiana Iowa Michigan Minnesota Missouri
New York Ohio Ontario Pennsylvania Wisconsin
Ten States Standards
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
8/52
Process Design
Physical Aeration Tank Capacity - lbs.
CBOD/1000 CF of Aeration Temperature Summer/Winter Final Settling Circular Center Feed or
Peripheral Feed
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
9/52
Process Design
Chemical
Ammonia Loading - Nitrification Phosphorous Loading & Removal pH & Alkalinity
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
10/52
Process Design
Biological CBOD Loading 15lbs 40 lbs D.O. in Aeration - 1.1 CBOD 4.6 NH3 MLSS, MLVSS, RAS
F/M Ratio - 0.5 1.0 2.0 MCRT Days
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
11/52
NitrificationNH3 NO2- NO3-
Nitrosomonas, Nitrobacter Aerobic process (in the presence of DO) 4.6 lbs O 2 required per lb ammonia-
nitrogen
7.14 lb alkalinity is consumed per poundof ammonia nitrogen
pH sensitive with optimal range between7.5 and 8.6
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
12/52
DenitrificationNO3- NO2- NO N2O N2
Anoxic process (not in the presence of DO) Nitrification can decrease pH Denitrification recovers 3.57 lb alkalinity per lb of
nitrogen removed
DO is consumed by nitrification anddenitrification recovers 2.9 lb per lb of nitrogenremoved
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
13/52
Plant Startup Contractor Wants to push to startup What are Ohio EPA expectations? Manufacturer Checkout Operator Training Are You Ready What additional processes are available
Do you and your Engineer have a ProcessControl Plan
Are you seeding the aeration tanks?
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
14/52
Plant Operation Summer/Winter Dry Weather/Wet Weather
DO Control RAS Rate - % 0f Influent Flow Chemical Feed Wasting Sludge Biological & Chemical
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
15/52
Summer Verses WinterSummerMCRT - 22.17 days
F/M Ratio - 0.13BOD Loading Rate - 16.5lbs./1,000 cf
Required MCRT No.2 - 7.6 days
DT for BOD Oxidation - 13.20hoursDT for NH3 Oxidation - 2.64hours
Aeration Tanks Required - 4.0
MLSS - 3,000 mg/lMLVSS - 2,100 mg/l
WinterMCRT - 35.47 days
F/M Ratio - 0.08BOD Loading Rate - 16.5lbs./1,000 c.f.
Required MCRT No.2 - 13.7
daysDT for BOD Oxidation - 13.15hoursDT for NH3 Oxidation = 2.71hours
Aeration Tanks Required - 4.0
MLSS - 4,800 mg/lMLVSS - 3,360 mg/l
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
16/52
Plant Operation Summer/Winter Dry Weather/Wet Weather
DO Control RAS Rate - % 0f Influent Flow Chemical Feed Wasting Sludge Biological & Chemical
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
17/52
Plant Monitoring Regular Rounds Visual Aeration Tanks & FST
Blowers/Aerators RAS Pumps
Clarity of the Effluent
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
18/52
Plant Monitoring SCADA Trending Flow, DO, ORP, pH Regular Rounds Visual
Trending Instruments - Flow, DO,ORP, pH
Lab Data MLSS, RAS, Settling Microbiology
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
19/52
Troubleshooting Foaming Bulking
Solids Loss Turbid Effluent Odor No CBOD or Ammonia Removal
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
20/52
Holy Crap!!
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
21/52
Observation of Settlometer Test
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
22/52
Characteristic Sludge Settling
0
200
400
600
800
1000
0 30 60 90 120 150 180
Time (minutes)
S S V FastNormal
Slow
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
23/52
Length of Settleometer Test
Normal - 30 minutes to 2hours - until completecompaction
Extended - until thesludge begins to rise
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
24/52
Look Under the Microscope
http://www.usabluebook.com/showproduct.aspx?productid=277108 -
8/11/2019 Activated Sludge Design Startup Operation Monitoring
25/52
The Bugs - Good/Bad/Ugly
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
26/52
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
27/52
Nocardia
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
28/52
Microthrix parvicella
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
29/52
Filaments 1851 and 0041
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
30/52
Filament Type 0092
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
31/52
Filament type 0092
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
32/52
WWTP: WWTP By:
Phil Anderson [email protected] Summer Summary
Operation: Activated Sludge Date: Summer 2009 3,000 MLSS, mg/l MCRT 7.30 days
20.0 Degrees C F/M Ratio 0.24
MEAN CELL RESIDENCE TIME (MCRT) 7.1 pH BOD Loading Rate 33.54lbs./1,000 c.f.
5.0 D.O. Aeration Required MCRT No.1 3.61 days
20.0 Influent Ammonia 1.7 Effluent Ammonia Required MCRT No.2 3.93 days
INPUT DATA: 6 Aeration Tanks On Line DT for BOD Oxidation 6.02hours
a 2.827 (MG) - Aeration tank volume (total) 0.471 Aeration Tank MG Each DT for NH3 Oxidation 1.49hours
b 2,250 (mg/l) - Mixed liquor VOLATILE suspended solids (MLVSS) Aeratio n Tank Vol Req uired 2.38MG
c 0.033 (MGD) - Daily flowrate of waste activated sludge (WAS) [See below] Aeratio n Tank s Requir ed 5.05
d 10,000 (mg/l) - WAS suspended solids Aeratio n Tank s On Line 6.00
e 7.600 (MGD) - Plant flow MLSS 3,000mg/l
f 10 (mg/l) - Effluent suspended solids MLVSS 2,250 mg/l
Nitrifiers (8% of MLVSS) 180 mg/l
SUPPLEMENTAL CALCULATIONS (MLVSS):
a 3,000 (mg/l) Assumed mixed liquor suspended solids (MLSS) EFF LIMIT
b 75.0 (%) - Assumed percent volatile CBOD Weekly 15 mg/l
2,250 (mg/l) - MLVSS TSS Weekly 18 mg/l
WASTE SLUDGE VOLUME: Fecal Weekly 2,000 (S Only)
a 0.70 Assumed sludge yield (lb. SS generated/lb. BOD removed) Ammonia WK 1.7 mg/l (S Only)
b 7.600 (MGD) - Plant flow Ammonia Winter WK NA
c 200 (mg/l) - BOD concentration entering aeration tanks P Weekly 1.5 mg/l
d 10 (mg/l) - BOD concentration following settling
e 8,430 lbs. biological sludge/day
f 10.0 (mg/l) -chemical sludges produced
h 634 lbs. chemical (Fe/AL) sludge generated/day
i 9,064 Total lbs. WAS/day
j 10,000 (mg/l) - Assumed WAS concentration (Note: 10,000 mg/l = 1.0%)
k 0.109 (MGD) -W aste activated sludge quantity
MCRT 7.30 days F/M Ratio = 0.24
BOD Loading Rate = 33.5 lbs./1,000 c.f.
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
33/52
WWTP: WWTP By:Phil Anderson [email protected] Winter Summary
Operation: Activated Sludge Date: Winter 4,500 MLSS, mg/l MCRT 10.95 days
11.0 Degrees C F/M Ratio 0.16
MEAN CELL RESIDENCE TIME (MCRT) 7.0 pH BOD Loading Rate 33.54lbs./1,000 c.f.
4.0 D.O. Aeration Required MCRT No.1 12.00 days
20.0 Influent Ammonia 4.0 Effluent Ammonia Required MCRT No.2 8.66 days
INPUT DATA: 6 Aeration Tanks On Line DT for BOD Oxidation 10.96hours
a 2.827 (MG) - Aeration tank volume (total) 0.471 Aeration Tank MG Each DT for NH3 Oxidation 2.13hours
b 3,375 (mg/l) - Mixed liquor VOLATILE suspended solids (MLVSS) Aeratio n Tank Vol Req uired 3.47MG
c 0.109 (MGD) - Daily flowrate of waste activated sludge (WAS) [See below] Aeratio n Tank s Requir ed 7.36
d 10,000 (mg/l) - WAS suspended solids Aeratio n Tank s On Line 6.00
e 7.600 (MGD) - Plant flow MLSS 4,500mg/l
f 10 (mg/l) - Effluent suspended solids MLVSS 3,375 mg/l
Nitrifiers (8% of MLVSS) 270 mg/l
SUPPLEMENTAL CALCULATIONS (MLVSS):
a 4,500 (mg/l) Assumed mixed liquor suspended solids (MLSS) EFFLUENT LIMITS
b 75.0 (%) -Assumed percent volatile CBOD Weekly 15 mg/l
3,375 (mg/l) - MLVSS TSS Weekly 18 mg/l
Fecal Weekly 2,000 (S Only)
WASTE SLUDGE VOLUME: Ammonia WK 1.7 mg/l (S Only)
a 0.70 Assumed sludge yield (lb. SS generated/lb. BOD removed) Ammonia Winter WK NA
b 7.600 (MGD) - Plant flow P Weekly 1.5 mg/l
c 200 (mg/l) - BOD concentration entering aeration tanks
d 10 (mg/l) - BOD concentration following settling
e 8,430 lbs. biological sludge/day
f 10.0 (mg/l) -chemical sludges produced
h 634 lbs. chemical (Fe/AL) sludge generated/day
i 9,064 Total lbs. WAS/day
j 10,000 (mg/l) - Assumed WAS concentration (Note: 10,000 mg/l = 1.0%)
k 0.109 (MGD) -W aste activated sludge quantity
MCRT 10.95 days F/M Ratio = 0.16
BOD Loading Rate = 33.5 lbs./1,000 c.f.
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
34/52
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
P e r c e n t
( % )
MCRT (Days)
Figure 1 Effect of MCRT On Nitrification
Nitrification Efficiency %
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
35/52
0.00
0.10
0.20
0.30
0.40
0.50
0.60
1 2 3 4 5 6 7 8 9 10
F / M
R a t i o
MCRT, Days
Figure 2 Relationship Between MCRT and F/M Ratio
Ratio
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
36/52
0
2
4
6
8
10
12
14
16
18
20
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
A m m o n n i a , m g /
l
Time (in 1/4 Hours)
Figure 3 Ammonia Removal vs Time
Ammonia
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
37/52
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
P e r c e n t
( % )
Temperature (C)
Figure 4 Effect of Temperature On Nitrification
Removal Rate %
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
38/52
0.00
0.02
0.04
0.06
0.08
0.10
0.12
1 2 3 4 5 6
L b . N
H / L b . M L S S / D a y
Dissolved Oxygen
Figure 5 Effect of D.O. on Nitrification
NH3 Oxidation Rate
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
39/52
0
10
20
30
40
50
60
70
80
90
100
1 2 3 4 5 6 7 8 9 10
P r e c e n t
( % )
pH
Figure 6 Effect of pH on Nitrification
Maximum Nitrification Rate (%)
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
40/52
0
50
100
150
200
250
300
350
400
1 2 3 4 5
A l k a l i n i t y
m g /
l
Influent Ammonia (mg/l x 10)
Figure 7 Alkalinity Used in Nitrification
Alkalinity Required mg/l
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
41/52
Maumee River WWTP
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
42/52
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
43/52
DO Probe
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
44/52
Single Stage Blower
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
45/52
Center Feed FST
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
46/52
Center Feed FST
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
47/52
Peripheral Feed FST
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
48/52
Peripheral Feed FST
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
49/52
Center Feed FST
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
50/52
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
51/52
QUESTIONS???
-
8/11/2019 Activated Sludge Design Startup Operation Monitoring
52/52