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POLISHING THE EFFLUENT FROM AN ANAEROBIC BIOLOGICAL PERCHLORATE TREATMENT PROCESS - SLIDES
Citation:
DUGAN, N., T. F. SPETH, D. WILLIAMS, M. MEYER, D. H. METZ, Y. SONG, AND R. SCHNEIDER. POLISHING THE EFFLUENT FROM AN ANAEROBIC BIOLOGICAL PERCHLORATE TREATMENT PROCESS - SLIDES. Presented at CINCINNATI WATER WORKS, CINCINNATI , OH, May 16, 2007.
Description:
Anaerobic biological processes effectively reduce perchlorate to chloride. However, the effluent can be biologically unstable, high in particulates and high in disinfection by-product precursor compounds. Such an effluent would be unsuitable for transmission into a drinking water distribution system. As a result, the United States Environmental Protection Agency (USEPA) is conducting a pilot-scale study to investigate the ability of downstream aerobic biofilters to: (1) produce biologically stable effluent, (2) remove disinfection by-product formation potential, (3) produce low particulate (< 0.1 NTU) effluent, and (4) achieve long (48 to 72 hour) filter run times. The achievement of these goals is being evaluated as a function of seasonal temperature variations (2 to 30°C), aerobic filter operating conditions and aerobic filter chemical pretreatment. The system consists of a fixed bed anaerobic contactor, reaeration and biologically active dual-media (anthracite/sand) filters. The anaerobic contactor has been in operation for 450 days. The downstream biofilters have been online and acclimating for 38 weeks. This study is on-going, and is the first to generate effluent polishing data for an anaerobic perchlorate biotreatment process that is detailed enough for use by design engineers.