Utilities

At the Cedar Rapids Water Pollution Control Facility we take the water used through everyday activities, such as showering and cooking, and refresh the resource before returning the water to the environment. The process we use to treat the wastewater is the same process used by nature, but enhanced to meet the demands of our community.

WPC-Treatment-Process-Graphic

There are many steps to treating wastewater:
1. Industry 

  • Contributes about 20 million gallons of wastewater per day 
  • Waste stream is stronger than residential

2. Anaerobic Reactors

  • Processes 2 million gallons per day of select industrial wastewater 
  • Organic matter is removed from the waste stream by microorganisms

3. Methane Gas

  • Microorganisms produce methane gas as a byproduct 
  • Gas helps fuel the incinerator and excess is flared

4. Residential & Commercial

  • Cedar Rapids, Hiawatha, Marion, Palo, Robins and Linn County residents and businesses contribute about 25 million gallons of wastewater per day
  • Wastewater comes from showers, clothes and dish washers, sinks, toilets, and other commercial operations

5. Bar Screen

  • Removes large items to protect downstream processes

6. Main Lift

  • Pumps wastewater from the collection system to the treatment process

7. Primary Settling 

  • Waste solids settle to the bottom and are removed

8. Secondary Treatment – Biological 

  • Wastewater trickles over plastic media where organic matter is removed from the waste stream by microorganisms

9. Advanced Treatment – Biological 

  • Additional organic matter is removed from the waste stream by microorganisms

10. Settling Basin 

  • Excess microorganisms settle to the bottom and are removed

11. Advanced Treatment – Ammonia Removal 

  • Ammonia is removed from a portion of the waste stream by microorganisms

12. Settling Basin 

  • Excess microorganisms settle to the bottom and are removed

13. Chlorine Disinfection 

  • Potentially harmful bacteria is killed by adding chlorine

14. Dechlorination 

  • Excess chlorine is removed from the treated effluent to minimize the impact on aquatic life

15. River Diffuser 

  • Treated effluent is added to the river through multiple outlets to minimize the impact on aquatic life

16. Waste Solids – Thickening

17. Belt FilterPress – Dewatering

  • About 65 percent of the water is removed from waste solids resulting in a thick, dirt-like substance

18. Biological Solids - Thickening

19. Biological Solids – Gravity Belt Thickening

20. Cell Wall Destruction with Temperature and Pressure (LPO) 

  • Cell walls are destroyed, releasing the liquid stored inside the microorganisms that make up the biological solids

21. Centrifuge Dewatering

  • About 60 percent of water is removed from the biological solids by highspeed rotation

22. Solids Blending 

  • Waste solids are mixed with biological solids to produce a nutrient rich, dirt-like substance, called biosolids

23. Solids Disposal

  • 120 tons or more of biosolids produced each day Disposed of onsite through incineration, or offsite through landfilling or land application.

Related Links

© 2016  Cedar Rapids, Iowa, 101 First Street SE

Powered By Revize Login