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The Missouri River Wastewater Treatment Plant (MRWWTP) CSO improvements are being constructed in three phases through multiple construction contracts. Construction for the first phase Schedule A, where facilities were added to treat high strength industrial waste from the South Omaha Industrial Area, began in 2012 and is complete. Construction for the second phase Schedule B1, where facilities were added and rehabilitated to increase primary and secondary capacity, began on April 1, 2014 and is complete. Construction for the third phase, Schedule B2, which will disinfect flow in excess of the biological treatment capacity of the plant, started construction in late 2016 and is on schedule to be complete by July 2019. These improvements, when combined with other projects that are being built to deliver additional wet weather flows to the plant, will result in a significant reduction in bacterial loading to the Missouri River, consistent with the goals of the Long Term Control Plan.
The MRWWTP was built in 1964 and treats an overall average of 25 million gallons per day of wastewater. Improvements are needed to increase this treatment capacity for wet weather flows to reduce the amount of untreated water sent to the Missouri River. During Schedule A, facilities were added to treat high strength industrial waste from the South Omaha Industrial Area. Reliable biological treatment capacity where organic matter is removed was increased to 64 million gallons per day to treat all dry weather flow and flows from smaller wet weather events. Benefits including water quality improvements, odor reduction, and energy sustainability were realized when Schedule A improvements came into operation in spring 2014. For Schedule B1, screening, grit removal, and settleable solids removal capacity was increased to 150 million gallons per day to accommodate flows from wet weather events. Flows from wet weather events that exceed the 64 million gallons per day biological treatment capacity now undergo screening, grit removal, and solids removal before being discharged to the Missouri River. The Schedule B2 will disinfect flow in excess of the 64 million gallons per day biological treatment capacity.