City 0f Waterloo-Wastewater Treatment Plant
Waterloo has two wastewater treatment plants. A domestic activated sludge treatment plant called the Easton Avenue Treatment Plant and an industrial activated sludge treatment plant called the Satellite Treatment Plant.
Easton Avenue Treatment Plant
Influent Wastewater loadings (Monthly Average):
- Flow- Monthly Average- 11.62 Million Gallons per Day (MGD)
- BOD5- Monthly Average- 198.7 mg/L
- TSS- Monthly Average- 228.4 mg/L
- Two-Vulcan Mensch Crawler bar screens and one manual bar rack
- Easton Ave. Lift Station with five 250 HP raw wastewater pumps at 12,000 gpm or 17 mgd for each pump
- Two-Smith & Loveless vortex grit units with two grit pumps to a cyclone grit concentrator and grit screw conveyor
- Two-Equalization (EQ) Basins, 10.0 MG per EQ basin. Total EQ capacity 20.0 MG. Flow goes to the EQ basins after grit removal
- Siemens odor control units for odor control of Easton Ave. and Satellite wet wells
- Odor control units include: water scrubber, biological scrubber, and carbon polisher
- Two-Circular primary clarifiers; 75 ft. diameter by 14-20 ft. depth, with a volume of 2.25 MG per clarifier
- Three-Primary sludge pumps (double piston)
- Scum tank with mixer and Scum pump (double disk)
- Activated Sludge with nitrification and denitrification zones
- Four-2.1 million gallon plug flow aeration basins with total capacity of 8.4 MG
- Three-Aeration blowers, Lamson multistage centrifugal, 800 HP
- Three-Mixed liquor recycle pumps
- 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 700 gpm
Effluent flow from the final clarifiers goes through a parshal fume, for flow measurement, and then to a river diffuser. When the Cedar River level is high, effluent flow is pumped to the Cedar River through the effluent lift station.
Effluent Lift Station:- Four-Effluent pumps, 18 Million Gallons per Day (MGD) each
- Flow- Monthly Average- 3.34 Million Gallons per Day (MGD)
- BOD5- Monthly Average- 456.4 mg/L
- TSS- Monthly Average- 375.7 mg/L
Industrial wastewater flows through a designated collection system from the Industrial Northeast Site of Waterloo to the Satellite lift station located at the Easton Ave. treatment plant.
Satellite Lift Station:- Three-Satellite 80 HP raw wastewater pumps at 3900 gpm or 5.6 mgd
- Two-Aeration basins, 5.5 MG per basin
- Five-Aeration blowers, Lamson multistage centrifugal, 800 HP
- Two-Mixed liquor recycle pumps for each aeration basin
- 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 2750gpm or 4.0 mgd
- Scum tank with mixer and Scum pump (double disk)
- Flow- Monthly Average- 14.59 MGD
- CBOD- Monthly Average- 3.52 mg/L
- TSS- Monthly Average- 5.67 mg/L
- Three-WAS tanks with a total operating capacity of 216,000 gallons
- Three-Blowers, positive displacement
- Three-Moyno thickener feed pumps
- Three-Ashbrook two meter gravity belt thickeners with polymer addition
- Four-Moyno pumps
- Four-Mixers
Sludge pumped from the belt thickeners and primary clarifiers is pumped to the TAS tanks. The TAS tank is for the mixing of different sludge and for a controlled feed into the digesters.
Temperature-Phased Anaerobic Digesters:- Two-Thermophillic Digesters (Primary Digesters)
- Four-Mesophillic Digesters (Secondary Digesters)
Sludge is pumped from the anaerobic digesters to the sludge storage tank and than to the dewatering building.
Dewatering Building:- Two-Komline-Sanderson two meter belts filter presses with polymer addition
