Brief Project Description
The City of Richmond Wastewater Treatment Plant has an existing dry weather flow design capacity of 45 million gallons per day (MGD). The City also operates a Combined Sewer System (CSS), which conveys municipal sewage and storm water in a single pipe. The plant’s VPDES permit requires wet weather flow treatment of at least 75 MGD until all CSS storage facilities are emptied. The plant’s existing liquid processes includes preliminary treatment, primary clarification, biological activated sludge process, secondary clarification, deep bed/gravity effluent filtration, disinfection and dechlorination prior to discharge to the James River. Solids handling processes include separate thickening of primary and waste activated solids, digestion, and dewatering prior to land application. Under this Agreement the City is installing Nutrient Reduction Technology, portions of which are being cost-shared to meet effluent concentration limitations of 8.0 mg/l for total nitrogen, and 0.50 mg/l for total phosphorus, both on an annual average basis. The City’s preliminary engineering report identifies improvements which will be implemented in five construction contracts, described as follows.