The 100-acre facultative lagoon system at the wastewater treatment plant in Iola, Kan., was big enough to serve the population of about 5,700 and a candy manufacturer.However, the design used only about a third of each cell, and over time various water-quality issues accumulated, starting with short-circuiting. A lagoon retrofit in 2007 brought the system under control and in compliance without high-horsepower equipment. Instead, 11 SolarBee mixers (Medora Corporation) thoroughly agitate the cells, helping the plant meet BOD and TSS discharge limits, while preventing odors in spring when the cells turn over.Hydraulic circulation“Along with short circuiting, we had poor dissolved
