EVALUATION AND DESIGN OF A CLOTH DISK FILTER TO MEET TITLE 22 REUSE CRITERIA

The City of Manteca (City) Regional Wastewater Quality Control Facility (WQCF) is adding filtration and UV disinfection facilities to meet California Title 22 wastewater reuse criteria. The cloth disk filter (CDF), manufactured by Aqua-Aerobic Systems, Inc. (AAS) was evaluated and selected as the technology for use at the WQCF. The evaluation process included a pilot filter study, researching historical operating performance of the filter, site visits to existing reclamation plants, and contact with facilities in the process of constructing or starting-up the CDF.Results from the pilot filter study indicated that the CDF was a feasible filtration technology for the WQCF which would meet Title 22 effluent requirements and provide adequate particle removal for effective downstream UV disinfection. References from existing CDF plants confirmed the operational reliability and low-maintenance requirements for the CDF. Final selection of the CDF was implemented after City personnel and design engineers visited several operational CDF facilities. A second site visit at additional CDF facilities aided in determining design features for the 20 mgd filtration process at the WQCF and in identifying potential startup issues.