Performance of a dual-power, multicellular, aerated lagoon system in Corcoran, California

0
A dual-power, multicellular, aerated (DPMC) lagoon system was designed and constructed for the city of Corcoran, California. The new process brought the plant into a full compliance with California Regional Water Quality Control Board (CRWQCB) effluent limits while saving approximately $110,000 per year in energy costs. The project was a modification of an existing aerated/ facultative (A/F) lagoon that was plagued by algal growth for several years. The results after the first 19 months of DPMC operation indicated that the monthly average effluent five-day biochemical oxygen demand (BOD5) and total suspended solids (TSS) concentrations were typically less than half of what they were prior. The DPMC aerated lagoon is applicable to many small plants as a process upgrade to underperforming lagoons or as a new process.

Prior to the upgrade detailed in this case study, the wastewater treatment plant (WWTP) serving the city of Corcoran, California, employed a conventional aerated/facultative (A/F) lagoon to treat primary effluent. The conventional lagoon was ineffective and the effluent often exceeded the discharge limits of 40 mg/L for five-day biochemical oxygen demand (BOD5) and 45 mg/L for total suspended solids (TSS). In 2001, the plant exceeded the average monthly discharge limits four times for BOD5 and nine times for TSS. Most of the violations occurred during the summer months.

In spite of effluent reclamation on land, the California Regional Water Quality Control Board (CRWQCB) insisted that the plant adhere to the discharge standards. Frequent notices of violation (NOV) were sent by the CRWQCB to the city of Corcoran regarding the ineffective plant. In response, the city chose to upgrade the existing A/F lagoon using a dualpower, multicellular aerated (DPMC) lagoon system to bring the plant into compliance. The use of a DPMC lagoon as a secondary treatment process is innovative. This paper describes and analyzes the project and its results.

Customer comments

No comments were found for Performance of a dual-power, multicellular, aerated lagoon system in Corcoran, California. Be the first to comment!