IMPACT OF WATER QUALITY ON DISINFECTION OF MEMBRANE BIOREACTOR EFFLUENTS

摘要

Installation of satellite and decentralized facilities, as a viable water recycling solution, has been increasing because of their demonstrated reliability, minimal footprint, elimination of new recycled water distribution pipelines and postponement of central treatment capital improvement projects. Water recycling applications with unrestricted access require treatment to eliminate pathogens. This is achieved when the water is oxidized, solids are removed and nutrients that can interfere with the disinfection process are minimized prior to disinfection. The California Department of Public Health Title 22 regulations define categories of reclaimed water through designated effluent criteria for total coliform bacteria and turbidity. It requires a CT of 450 mg-min/L when chlorine disinfection is used following filtration. The regulations specify CT as a product of total chlorine residual and modal contact time (not less than 90 minutes based on peak dry weather flow) measured at the same point.