The Grandville (Michigan) Clean Water Plant uses an activated sludge process with fine-bubble aeration to treat an average flow of 6 mgd, well below its 10 mgd design capacity.
The plant routinely encounters low effluent pH, especially in the warmer months, due to nitrification that consumes alkalinity. Low pH has often led to problems including poor settling and incomplete nitrification.The Grandville plant has three activated sludge trains, each with three passes. In 2024, the middle pass of each train was upgraded with the FlexZone adaptive process volume system (EnviroMix) to optimize the bioreactor environment and improve aeration control.The upgrade was completed
