Facility Plan Appendices - May 2013 - City of Woonsocket

255 Pages·2013·6.68 MB·English

APPENDIX A

WWTF Design Data

APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
SUMMARY OF PERMIT LIMITS
Existing Design Current Revised Design
UNITS 2000 2010a 2030
RIPDES Permit Limits
Seasonal - June 1 thru Oct. 31
Effluent cBOD Concentration
Average Monthly mg/l 10 10 10
Average Weekly mg/l 15 15 15
Maximum Daily mg/l 17 17 17
Effluent cBOD Load
Average Monthly lb./day 1,340 1,340 1,340
Maximum Daily lb./day 2,270 2,270 2,270
Effluent TSS
Average Monthly mg/l 15 15 15
Average Weekly mg/l 20 20 20
Maximum Daily mg/l 25 25 25
Effluent BOD Load
Average Monthly lb./day 2,000 2,000 2,000
Maximum Daily lb./day 3,335 3,335 3,335
Seasonal - Nov. 1 thru May 31
Effluent BOD Concentration
Average Monthly mg/l 30 30 30
Average Weekly mg/l 45 45 45
Maximum Daily mg/l 50 50 50
Effluent BOD Load
Average Monthly lb./day 4,000 4,000 4,000
Maximum Daily lb./day 6,670 6,670 6,670
Effluent TSS
Average Monthly mg/l 30 30 30
Average Weekly mg/l 45 45 45
Maximum Daily mg/l 50 50 50
Effluent TSS Load
Average Monthly lb./day 4,000 4,000 4,000
Maximum Daily lb./day 6,670 6,670 6,670
Nutrients:
Effluent Ammonia-N - Monthly Average Concentration
June 1 - October 31 mg/l 2 2 2
November 1 - April 30 mg/l 15 15 15
May 1 - 31 mg/l 12 12 12
Effluent Total-N - Monthly Average Concentration
April 1 - 30 mg/l 10 10 10
May 1 - October 31 mg/l 10 3 3
November 1 - March 31 mg/l -- -- --
Effluent Total Phosphorus - Monthly Average Concentration
April 1 - October 31 mg/l 1.0 0.1 0.1
November 1 to March 31 mg/l -- 1.0 1.0
Metals & Toxics - Monthly Average:
Cadmium µg/l 2.7 0.66 0.66
Chromium, Hexavalent µg/l 42.6 -- --
Copper µg/l 26.8 21.1 21.1
Cyanide µg/l 22.2 21.3 21.3
Lead µg/l 5.4 5.4 5.4
Zinc µg/l 241.0 272.0 272.0
Butylbenzylphthalate µg/l 7.8 -- --
Naphthalene µg/l 10.6 -- --
aCurrent year data is based on WWTF data from May 2007 through October 2010
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
SUMMARY OF DESIGN FLOWS AND LOADS
Existing Design Current Revised Design
UNITS 2000 2010a 2030
RAW INFLUENT - Includes Septage
Influent Flow (Final Effluent)
Annual Average MGD 16.0 7.8 9.0
Max. Month MGD 16.0 13.0 16.0
Peak Daily MGD 24.0 22.2 24.0
Peak Hourly MGD 32.0 32.0 32.0
Influent BOD
Annual Average lbs./day 21,350 14,200 16,330
Max. Month lbs./day - 27,100 31,170
Peak Daily (98th Percentile) lbs./day - 37,000 42,550
Peak Daily (100th Percentile) lbs./day - 51,300 59,000
Influent TSS
Annual Average lbs./day 16,013 11,600 13,340
Max. Month lbs./day - 18,800 21,620
Peak Daily (98th Percentile) lbs./day - 25,900 29,790
Peak Daily (100th Percentile) lbs./day - 39,200 45,080
Influent Ammonia
Annual Average lbs./day 2,669 1,146 1,320
Peak Daily (98th Percentile) lbs./day - 1,997 2,300
Peak Daily (100th Percentile) lbs./day - 1,997 2,300
Influent TKN
Annual Average lbs./day 5,338 1,800 2,070
Peak Daily (98th Percentile) lbs./day - 3,267 3,760
Peak Daily (100th Percentile) lbs./day - 3,629 4,170
Influent Phosphorus
Annual Average lbs./day 2,268 237 270
Peak Daily (98th Percentile) lbs./day - 354 410
Peak Daily (100th Percentile) lbs./day - 368 420
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
SUMMARY OF DESIGN FLOWS AND LOADS
Existing Design Current Revised Design
UNITS 2000 2010a 2030
RETURN FLOWS
Flow
Annual Average MGD 2.6 3.9 3.9
Max. Month MGD 2.6 5.6 5.1
Peak Daily MGD 2.6 8.5 5.1
Peak Hourly MGD 2.6 5.1
BOD
Annual Average lbs./day 4,644 10,000 10,830
Max. Month lbs./day 4,644 19,400 20,760
Peak Daily (98th Percentile) lbs./day 4,644 26,700 28,690
Peak Daily (100th Percentile) lbs./day - 45,570 47,560
TSS
Annual Average lbs./day 6,882 15,900 16,160
Max. Month lbs./day 6,882 54,300 54,930
Peak Daily (98th Percentile) lbs./day 6,882 56,100 58,390
Peak Daily (99th Percentile) lbs./day - 74,900 77,190
Ammonia
Annual Average lbs./day 1,830 319 360
Peak Daily (98th Percentile) lbs./day 1,830 575 640
Peak Daily (100th Percentile) lbs./day - 580 640
TKN
Annual Average lbs./day 1,182 1,230
Peak Daily (98th Percentile) lbs./day 0 2,560 2,640
Peak Daily (100th Percentile) lbs./day - 2,849 2,930
Total Phosphorus
Annual Average lbs./day - 861 890
Peak Daily (98th Percentile) lbs./day - 2,333 2,380
Peak Daily (100th Percentile) lbs./day - 2,621 2,670
SOLIDS GENERATION
Primary Sludge
Annual Average lbs./day 16,891 26,700 28,266
Max. Month lbs./day 16,891 61,600 64,460
Peak Daily lbs./day 16,891 142,300 149,107
Waste Activated Sludge
Annual Average lbs./day 13,905 13,249 14,883
Max. Month lbs./day 13,905 14,873 16,773
Peak Daily lbs./day 13,905 33,302 38,324
Combined Sludge Production
Annual Average lbs./day 30,796 39,949 43,149
Max. Month lbs./day 30,796 76,473 81,234
Peak Daily lbs./day 30,796 175,602 187,431
aCurrent year data is based on WWTF data from May 2007 through October 2010
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
SEPTAGE RECEIVING
Existing Design Current Revised Design
UNITS 2000 2010a 2030
SEPTAGE QUANTITIES
Average Day gpd -- 2,250 2,250
Maximum Month gpd -- 5,000 5,000
Maximum Day gpd -- 20,000 20,000
RECEIVING STATIONS
Number 1 1 1
Type Dump Manhole Dump Manhole Quick Connect
Size in. N/A N/A 6
Flow Meter in. N/A N/A 1
Type N/A N/A Mag
Range gpm N/A N/A 600
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
HEADWORKS - SCREENING
Existing Design Current Revised Design
UNITS 2000 2010 2030
FLOW
Annual Average MGD 16.0 7.8 9.0
Max. Month MGD 16.0 13.0 16.0
Peak Daily MGD 24.0 22.2 24.0
Peak Hourly MGD 32.0 32.0 32.0
MECHANICAL BAR SCREEN
Number 1 1 1
Number Online (Normal conditions) 1 1 1
Screen Type Catenary Catenary Climber
Channel Dimensions
Width ft. 4.5 4.5 4.5
Depth ft. 6 6 6
Downstream Depth ft. 3 3 3
Bar Screen Clear Opening in. 2 2 3/8
Angle of Setting ° 80 84 84
Motor Size HP 2 2 5
Motor Classification Class 1, Div. 1 Class 1, Div. 1 Class 1, Div. 1
Screening Removal:
Capacity, each ft.3/hr. 246
Projected Screenings Quantity
Annual Average ft.3/mgal. 6.5
Peak Daily ft.3/mgal. 33.0
Peak Hourly ft.3/mgal. 130.0
Projected Screenings Quantity
Annual Average ft.3/hr 2.4
Peak Daily ft.3/hr 33.0
Peak Hourly ft.3/hr 173.3
COMMINUTORS
Number 2 2 2
Number Online (typically) 1 1 1
Manufacturer Worthington Corp. Worthington Corp. Worthington Corp.
Model Number 36L-6 36L-6 36L-6
Motor Size HP 2 2 2
Voltage V 440 (3 phase) 440 (3 phase) 440 (3 phase)
Frequency Hz 60 60 60
Motor Classification Class 1, Div. 1 Class 1, Div. 1 Class 1, Div. 1
Capacity, each MGD 11 11 11
Channel Width in 48 48 48
Screen Diameter in 30 30 30
Screen Slot Width in 0.375 0.375 0.375
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
HEADWORKS - SCREENING
Existing Design Current Revised Design
UNITS 2000 2010 2030
SCREENINGS CONVEYORS
Screenings Conveyor 1:
Type: Shaftless
Length ft 28
Screw Diameter in 11.0
Trough Diameter in 12.5
Liner Type UHMW PE
Liner Thickness in 0.45
Screw speed, rpm rpm 15
Fill Rate % 25
Capacity cf/hr 110
Capacity cy/hr 4.1
Capacity ton/hr 3.3
Motor, hp hp 5
Motor Classification Class 1, Div. 2
Motor speed rpm 1,750
Screenings Conveyor 2:
Type: Shaftless
Length ft 20
Screw Diameter in 11.0
Trough Diameter in 12.5
Liner Type UHMW PE
Liner Thickness in 0.45
Screw speed, rpm rpm 15
Fill Rate % 25
Capacity cf/hr 110
Capacity cy/hr 4.1
Capacity ton/hr 3.3
Motor, hp hp 5
Motor Classification Class 1, Div. 2
Motor speed rpm 1,750
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
RAW INFLUENT PUMPING
Existing Design Current Revised Design
UNITS 2000 2010a 2030
FLOW
Annual Average MGD 18.6 11.7 12.9
Max. Monthly MGD 18.6 18.1 21.1
Peak Daily MGD 26.6 26.1 29.1
Peak Hourly MGD 34.6 35.0 37.1
INFLUENT WETWELLS
Number 2 2 2
Number Online 2 2 2
Operations Bldg Wet Well
Dimensions
Total Length ft. 40.5 40.5 40.5
Usable Length (varies) ft. 30.5 30.5 30.5
Total Width ft. 12 12 12
Usable Width (varies) ft. 7.5 7.5 7.5
Depth @ Max W.S. 104.00 ft. 7 7 7
Total Rectangular Volume gal. 25,450 25,450 25,450
Volume, Concrete Fill gal. 6,522 6,522 6,522
Actual Pumping Volume gal. 18,928 18,928 18,928
Detention Time
Annual Average min. 1.5 2.3 2.1
Max. Monthly min. 1.5 1.5 1.3
Peak Daily min. 1.0 1.0 0.9
Peak Hourly min. 0.8 0.8 0.7
Aministration Bldg Wet Well (Total Volume without concrete knock out wall)
Dimensions
Total Length ft. 48.67 48.67 48.67
Actual Length (varies) ft. 36.67 36.67 36.67
Total Width ft. 12.5 12.5 12.5
Actual Width (varies) ft. 6.5 6.5 6.5
Max. Depth @ Max W.S. 104.00 ft. 7.2 7.2 7.2
Total Rectangular Volume gal. 32,951 32,951 32,951
Volume, Concrete Fill gal. 9,923 9,923 9,923
Actual Pumping Volume gal. 23,028 23,028 23,028
Detention Time
Annual Average min. 1.8 2.8 2.6
Max. Monthly min. 1.8 1.8 1.6
Peak Daily min. 1.2 1.3 1.1
Peak Hourly min. 1.0 0.9 0.9
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APPENDIX A. WOONSOCKET, RI WWTF - BASIC DESIGN DATA
RAW INFLUENT PUMPING
Existing Design Current Revised Design
UNITS 2000 2010a 2030
Aministration Bldg Wet Well (Usable Volume with existing concrete knock out wall)
Dimensions
Total Length ft. 22.17 22.17 22.17
Actual Length (varies) ft. 16.17 16.17 16.17
Total Width ft. 12.5 12.5 12.5
Actual Width (varies) ft. 6.5 6.5 6.5
Max. Depth @ Max W.S. 104.00 ft. 7.2 7.2 7.2
Total Rectangular Volume gal. 15,010 15,010 15,010
Volume, Concrete Fill gal. 4,662 4,662 4,662
Actual Pumping Volume gal. 10,348 10,348 10,348
Detention Time
Annual Average min. 0.8 1.3 1.2
Max. Monthly min. 0.8 0.8 0.7
Peak Daily min. 0.6 0.6 0.5
Peak Hourly min. 0.4 0.4 0.4
RAW INFLUENT (SEWAGE) PUMPS
Operations Building
Number 3 3 3
Name/Tag RSP 2, 3, & 4 RSP 2, 3, & 4 RSP 2, 3, & 4
Type Centrifugal Centrifugal Centrifugal
Manufacturer Worthington Worthington Worthington
Model 16-MCC-1 16-MCC-1 16-MCC-1
Rotational Speed RPM 700 700 700
Suction/Discharge piping in. 16 16 16
Motor Size HP 50 50 50
Motor Drive VFD VFD VFD
Design Capacity
Number Online 3 3 3
Flow, each gpm 5,600 5,600 5,600
Flow, each MGD 8 8 8
Total Pump Capacity (w/ 3 pumps operating in parallel)
Flow, total gpm 16,800 16,800 16,800
Flow, total MGD 24.2 24.2 24.2
Total Dynamic Head ft. 28.5 28.5 28.5
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