Water Pollution


CITY OF WATERLOO
WASTE MANAGEMENT SERVICES
WASTEWATER TREATMENT PLANT
Waterloo has two wastewater treatment plants at 3505 Easton Avenue and a Pretreatment Anaerobic Lagoon at 2749 Independence Ave.
The Anaerobic Lagoon flows to the Satellite Wet Well.
The two wastewater treatment plants are: a domestic Activated Sludge Treatment Plant called Easton Avenue Wastewater Treatment Plant and an industrial Activated Sludge Treatment Plant called Satellite Wastewater Treatment Plant.
Total Effluent Discharge to the Cedar River Outfall #801 & #009, Annual Average for Year 2014:
  • Flow- 13.02 Million Gallons per Day (MGD)
  • CBOD (Carbonaceous Biochemical Oxygen Demand)- 8.13 mg/L
  • TSS (Total Suspended Solids)- 19.01 mg/L
  • NH3-N (Ammonia Nitrogen)- 17.39 mg/L
Easton Avenue Wastewater Treatment Plant
 
Influent Wastewater Loadings Outfall #001,
Annual Average for Year 2014:
  • Flow- 10.01 Million Gallons per Day (MGD)
  • BOD5 (Five-day Biochemical Oxygen Demand)- 225.03 mg/L
  • TSS (Total Suspended Solids)- 237.12 mg/L
  • TKN (Total Kjehldahl Nitrogen)- 49.36 mg/L
Preliminary Treatment:
  • Two-Bar Screens, Vulcan Mensch Crawler, and one manual Bar Rack
  • Five-Raw Wastewater Pumps (RWW) at the Easton Ave. Lift Station, 250 HP at 12,000 gallons per minute (gpm) or 17.0 MGD for each pump
  • Two-Grit Removal Units, Smith & Loveless vortex, with two Grit pumps to a Cyclone Grit Concentrator and Grit Screw Conveyor
  • Influent Sampler Outfall #001 is located after Easton RWW pumps, but before grit removal
Flow Equalization Basins:
  • Two-Flow Equalization (FEQ) Basins, 10.0 MG per FEQ Basin, Total FEQ Basin capacity of 20.0 MG
  • Flow to the FEQ Basins is after Easton grit removal
  • FEQ Basin flow is returned to the Easton Wet Well when the Easton Ave. Treatment Plant is able to treat the flow
  • The FEQ Basin has an Overflow/Bypass structure to the Cedar River when the Easton Ave. Treatment Plant is unable to treat high influent flows, Outfall #010
Odor Control Building:
  • Odor Control Units, Siemens, for odor control of Easton Ave. and Satellite wet wells
    • Odor Control Units include: Water Scrubber, Biological Scrubber, and Carbon Polisher
Primary Treatment:
  • Two-Circular Primary Clarifiers; 150 ft. diameter by 14-20 ft. depth, with a volume of 2.25 MG per clarifier
  • Three-Primary Sludge pumps, Vogelsang (rotary lobe pump) at 180 gpm
  • Scum tank with Mixer and Scum pump (double disk pump)
Secondary Treatment:
  • Flow from Primary Clarifiers effluent, Easton RAS pumps, Easton Mixed Liquor Recycle pumps & Satellite Bypass Structure flows to the Easton Anoxic Selector Basin where all these flows are mixed together and split to the Aeration Basins
  • Secondary treatment is an Activated Sludge Treatment with nitrification and denitrification (for Alkalinity recovery) zones
  • Four-2.1 Million Gallon (MG) plug flow aeration basins with Four aeration zones (one – anoxic & three – aerobic zones) and total capacity of 8.5 MG
  • Three-Aeration Blowers, Lamson multistage centrifugal, 800 HP, 10,500 cfm
  • Three-Mixed Liquor (ML) Recycle pumps, Constant speed at 14,000 gpm or 20.2 MGD
Final Clarifiers:
  • Four-Circular Final Clarifiers; 105 ft. diameter & 18 ft. depth, with a volume of 1.165 MG per clarifier
  • Five-Return Activated Sludge (RAS) pumps, a maximum capacity of each pump is 6000 gallons per minute (gpm) or 8.6 MGD
  • Scum tank with mixer and Scum pump (double disk)
  • Waste Activated Sludge pump, maximum capacity 800 gpm
Effluent flow from the Final Clarifiers goes through a Parshal Fume, for flow measurement before Disinfection. Effluent Sampling, to Cedar River, for Outfall #801 & #009 is sampled at Parshal Fume.
Disinfection:
  • Two-Banks in series, Ultra Violet (UV) Light Unit
  • Peak Hourly Wet Weather flow of 47.1 MGD
The effluent from the UV Building then flows to a River Diffuser or when the Cedar River level is high, the effluent flow is pumped to the Cedar River through Four pumps at the Effluent Lift Station.
Effluent Lift Station:
  • Four-Effluent pumps, 18.0 Million Gallons per Day (MGD) per pump
 
Satellite Wastewater Treatment Plant
Influent Wastewater Loadings Outfall #008, Annual Average for Year 2014:
  • Flow- 3.13 Million Gallons per Day (MGD)
  • BOD5 (Five-day Biochemical Oxygen Demand)- 280.66 mg/L
  • TSS (Total Suspended Solids)- 275.28 mg/L
  • TKN (Total Kjehldahl Nitrogen)- 142.48 mg/L
Industrial wastewater flows through a dedicated collection system pipe from the Industrial Northeast Site of Waterloo to the Satellite Lift Station located at the Easton Ave. treatment plant.
Satellite Lift Station:
  • Three-Satellite Raw Wastewater (RWW) pumps at the Satellite Lift Station, 80 HP at 3900 gpm or 5.6 MGD for each pump
  • Influent Sampler Outfall #008 at Satellite RWW pump location
Magnesium Hydroxide (Mg(OH)2) Building:
  • Magnesium Hydroxide (Mg(OH)2) Building is where Mg(OH)2 chemical is added for alkalinity control in the Satellite Aeration Basins
Satellite Aeration Basins:
  • Activated Sludge with nitrification and denitrification (for Alkalinity recovery) zones, Aeration Basins with Fine & Coarse Diffusers
  • Two-Aeration Basins, 5.5 MG per basin
  • Five-Aeration Blowers, Lamson multistage centrifugal, 800 HP, 10,500 cfm
  • Two-Mixed Liquor Recycle pumps, variable speed 50 – 400%, for each Aeration Basin
Final Clarifiers:
  • Four-Final Clarifiers, 90 ft. diameter & 14 ft. depth, with a volume of 666,000 gallons per clarifier
  • Five-Return Activated Sludge (RAS) pumps, maximum capacity of each pump 2750 gpm or 4.0 MGD
  • Scum Tank with mixer and Scum pump (double disk)
Clarifier Effluent flows to a Parshal Flume for flow measurement and Effluent Sampling Outfall #801 & #009.
 
Sludge Handling
Waste Activated Sludge (WAS) Tank & Pump Building:
  • WAS from Easton RAS header & Satellite RAS header flows to WAS Tank
  • Three-WAS Tanks with a total capacity of 269,100 gallons
  • Three-Positive Displacement Blowers, for mixing of WAS Tanks
  • Three-Progressive Cavity Thickener Feed pumps, Moyno, maximum capacity 700 gpm
Sludge Thickening:
  • Three-Ashbrook two meter Gravity Belt Thickeners with polymer addition
  • Three-TAS Transfer pumps to pump thickened sludge from Thickeners to TAS Tank
Thickened Activated Sludge (TAS) Building and Three Sludge Holding Tanks:
  • Four-Progressive Cavity pumps, Moyno.
    • Two pumps run in tandem, #1 & 2 and #3 & 4
    • #1 & 3 TAS pumps pumping capacity = 110 gpm
    • #2 & 4 TAS pumps pumping capacity = 88 gpm
  • Three-Sludge Holding Tanks, with a total capacity of 115,000 gallons
  • Four-Tank Mixers
Sludge is pumped from the Gravity Belt Thickeners and Primary Clarifiers to the TAS Tanks. The TAS Tanks are for the mixing of different sludge and for a controlled feed into the Temperature-Phased Anaerobic Digesters.
Temperature-Phased Anaerobic Digesters:
  • Two-Thermophillic Digesters (Primary Digesters)
  • Four-Mesophillic Digesters (Secondary Digesters)
  • Two-Mesophillic Digesters have Floating Covers for methane gas holding capacity
  • Two-Digester Sludge Transfer pump. Pumps transfer sludge from Digesters to Sludge Storage Tanks, each pump pumping capacity 160 gpm
  • Digester hot water Boiler System for heating of sludge
  • Temperature-Phased Anaerobic Digester system produces Class A or Class One Biosolids
Sludge is pumped from the Anaerobic Digesters to the Sludge Storage Tank and then to the Dewatering Building.
Sludge Storage Tank & Building:
  • One-Storage Tank divided into two sides
  • Sludge Storage Tank Total capacity of 1.85 MG
  • Sludge Storage Building has Belt Filter Presses Feed pumps at 200 gpm, Moyno pumps
Dewatering Building:
  • Two-Komline-Sanderson two meter Belts Filter Presses with polymer addition
Dewatered sludge is than land applied to agriculture land. 14,497 Total Annual Wet Tons or 2,477 Total Annual Dry Tons of sludge was dewatered in year 2014.
 
Anaerobic Lagoon
  • Operate an Anaerobic Covered Lagoon, Wastewater from Tyson Foods, Inc. is treated in the Anaerobic Lagoon
  • Four-Wet Well pumps at 2400 gpm or 3.46 MGD
  • Two-Gas Blowers
  • Effective Volume 37.8 MG; Surface Area 5.02 Acres, Depth 30 ft.
 
Iowa Department of Natural Resources (IDNR) Effluent (to River) Permit Outfall # 801 and/or # 009: Permit Number: 0790001
  • CBOD5 (Carbonaceous Biochemical Oxygen Demand Five Day)
    • 30 Day Average is: 25.0 mg/L
    • 7 Day Average is: 40.0 mg/L
  • TSS (Total Suspended Solids)
    • 30 Day Average is: 30.0 mg/L
    • 7 Day Average is: 45.0 mg/L
  • PH – For Outfall # 801 Diffuser Discharge
    • Minimum – 6.0
    • Maximum – 9.0
  • E. COLI - Disinfection – March 15th of each year to November 15th of each year.
    • Average limit 126.0 org/100 ml
  • NH3-N (Ammonia Nitrogen) for Outfall #801
    • NH3-N Varies from Month to Month with:
      • Highest Month in February with a 30 Day Average of 70.3 mg/L & a Daily Maximum of 149.4 mg/L
      • Lowest Month in June with a 30 Day Average of 11.6 mg/L & a Daily Maximum of 78.1 mg/L
  • NH3-N (Ammonia Nitrogen) for Outfall #009
    • NH3-N Varies from Month to Month with:
      • Highest Month in January with a 30 Day Average of 18.0 mg/L & a Daily Maximum of 18.0 mg/L
      • Lowest Month in June with a 30 Day Average of 3.9 mg/L & a Daily Maximum of 16.2 mg/L

City of Waterloo, Waste Management Services

If there are any questions or if we could be of any more help, please contact us. City of Waterloo Website: www.ci.waterloo.ia.us

City of Waterloo
Waste Management Services
3505 Easton Avenue
Waterloo, Iowa 50702
(319) 291-4553