Plant utilizes efficient mixing technology
Problem: The 4 mgd activated sludge wastewater treatment plant in Albion, Michigan, has two parallel trains that make it easy to adjust one side while holding the other constant. Kent Phillips, plant superintendent, hypothesized that modulating mixer speed would reduce dissolved oxygen, maintaining mixing while reducing surface churning, thus improving biological phosphorus removal and allowing him to reduce chemical and energy use. After promising test results, he began experimenting and decided to install a more efficient mixer.
Solution: The facility acquired a Flygt 4200 Series mixer to replace the existing 2 hp mixer, which drew a continuous
