Aerated Sludge Holding Tanks

The Board of Commissioners for Charles County seeks qualified contractors to prepare contract drawings and specifications, obtain all applicable permits, and provide construction engineering services for the proposed upgrades of the Aerated Sludge Holding Tanks. This initiative is in direct response to the County’s need for their aerated sludge holding tanks to achieve three days of storage at 20 MGD ADF. The proposed improvements aim to achieve this goal ensuring the plant’s readiness for future growth and environmental compliance.

The Mattawoman Wastewater Treatment Plant (MWWTP) was constructed in the mid-1970s and currently serves the northern portion of Charles County and a southern portion of Prince George’s County. The MWWTP is rated for an average daily flow of 20 million gallons per day (MGD). The MWWTP is undergoing essential upgrades to its aerated sludge holding tanks. The tanks, originally constructed as aerobic digester tanks, currently function as aerated sludge holding tanks to provide flow equalization upstream of the dewatering facility rather than volatile solids reduction through aerobic digestion.
The existing Aerated Sludge Holding Tanks do not meet the County’s need for three days of storage capacity at 20 MGD ADF. This project aims to design upgrades for the Aerated Sludge Holding Tanks that will increase tank capacity to achieve this goal.