The Fond du Lac (Wisconsin) Regional Wastewater Treatment and Resource Recovery Facility must meet stringent phosphorous limits of 0.8 mg/L to 0.19 mg/L by spring 2023.After submitting a preliminary phosphorus reduction plan to the state in 2013, plant and city officials faced the challenge head-on. In 2014, the city hired the Strand Associates engineering firm, which worked with operators to find an answer.“Without a technical solution, we faced building a fourth aeration basin to handle increased industrial loading through the headworks and a high sidestream load from our high-strength waste receiving station,” says Cody Schoepke, plant superintendent.The team evaluated three
