Council Bluffs, IA

Trickling Filter

  • Client City of Council Bluffs
  • Type Wastewater
  • Services Evaluation, Design, Construction
  • Project Manager Keith Hobson, P.E., BCEE
  • Project Engineer Laurie Twitchell, P.E., BCEE

Challenge

In 2009, the city of Council Bluffs WPCP staff requested a plan to upgrade the trickling filter recirculation pump station and replace the motor control center. This project was initiated by FOX to obtain additional grant funds for Green energy efficiency.

1. Council Bluffs WWTP P1100726

Solution

The five large trickling filter recirculation pumps (150-200 hp each) and two humus return pumps (40 hp each) were paired with adjustable frequency drives to pace flow based on process requirements and reduce energy consumption. The more efficient drives and controls provide automatic operation at reduce costs. FOX completed the design and the project was bid and constructed in 2010.

3. Council Bluffs Trickling Filter with LAT P1100720 - Copy

Outcome

This project was awarded an American Recovery and Reinvestment Act (ARRA) Green Project grant due to the decrease in energy consumption as a result of the improvements. In addition to the scope noted above, the plant effluent water pumps were replaced as part of the project to increase the pressure and capacity for use throughout the plant. Adjustable frequency drives were also installed on these pumps to provide better operation and reduced energy consumption.