Rotor Electric of Michigan, LLC was awarded Great Lakes Water Authority’s (GLWA’s) contract PC-757 for Rehabilitation of Clarifier Facilities at the Detroit Wastewater Treatment Plant (WWTP). The multi-million dollar three-package award includes:
The work includes installing ventilation and atmospheric control for the pipe gallery and providing new regular and emergency lights. Rotor is also providing rehabilitation of 12 drain lines from rectangular clarifiers 1-12 and circular clarifiers 15 and 16. Additionally, we are replacing all of the sludge collector drives, sludge pumps, and sump pumps within the rectangular clarifier facility. The center drives with over one million pound-feet of torque in the circular clarifiers are also being replaced with sump pumps to collect drainage and discharge to the clarifiers. Also included is rehabilitation work in the Electrical/Mechanical Building.
Clarifiers are extremely important pieces of equipment for processing wastewater. Primary clarifiers use gravity to allow floating and settleable solids to sink to the bottom of the tanks and be swept away. Secondary clarifiers work in a similar way to remove biological growth in the tanks.
There are circular clarifier tanks and rectangular ones. In larger wastewater treatment plants, there are oftentimes more rectangular clarifiers than circular ones. Land availability and construction/operating costs are major considerations for water treatment plants. Rectangular tanks make more efficient use of space and layout.
One of GLWAs key objectives for this project is meeting National Pollutant Discharge Elimination System (NPDES) permit and NEC requirements. Both programs work to control the discharge of pollutants into surface waters by imposing effluent limitations to protect the environment.