Combined sewer overflows (CSOs) occur in communities with combined sewer systems, which collect both sewage and stormwater runoff in the same pipes. During heavy rain events, the volume of wastewater can exceed the capacity of the collection system and the treatment plant, resulting in CSOs, where untreated or partially treated wastewater is discharged into nearby water bodies. Treating CSOs presents several operational challenges. High flow rates are a primary challenge. CSOs can cause a sudden surge in flow to the wastewater treatment plant, exceeding its hydraulic capacity. This can lead to process upsets and reduced treatment efficiency. Solutions include flow equalization basins to store excess flow and release it at a controlled rate. Peak flow management strategies, such as real-time control systems that optimize the use of storage and trea....
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