California Title 22 - Unrestricted Reuse Cloth Media Filtration Technology Approval Project, Roseville, CA
Caliskaner was the project manager and principal investigator of a tertiary filtration pilot and evaluation project to assess the performance of the cloth depth filtration technology at increased filtration rates using three different types of cloth filter media to receive Title 22/unrestricted reuse approval from the California Department of Drinking Water (CDDW). The pilot study was conducted at the City of Roseville’s (CA) Pleasant Grove wastewater treatment plant in 2016.
Each of the three cloth media filters have previously obtained Title 22 conditional acceptance at hydraulic loading rates (HLRs) of 6 to 7 gallons per minute per square foot (gpm/ft2). The objective of this testing was to reevaluate the performance of these cloth media to seek a practical limit of hydraulic capacity while remaining compliant with Title 22 requirements. The cloth filter media which were subject to this additional peak-capacity testing included OptiFiber PA-13 nylon pile fabric, PES-13 polyester pile fabric, and PES-14 polyester microfiber pile fabric which have been previously rated at 6, 6, and 7 gpm/ft2, respectively.
Based on demonstration study results, CDDW approved all three cloth filter media for Title 22 unrestricted reuse applications at filtration rates up to 22 gal/min-ft2.