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APPLICATION OF ANAEROBIC/AEROBIC ACTIVATED SLUDGE TO PHOSPHORUS-DEFICIENT WASTEWATER TREATMENT

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Abstract:

Anaerobic/aerobic (AnA) and completely aerobic (CA) laboratory-scale sequencing batch reactors (SBRs) were used to investigate the suitability of the AnA process for treating phosphorus (P)-deficient wastewaters with highly variable influent COD loading to meet both effluent TSS and P limits. The AnA and CA SBRs were subjected to transient influent COD loading patterns that simulated (#1) daily COD Loading fluctuations, (#2) low weekend COD loading, and (#3) extended low COD loading periods. During the Loading Pattern #1 experiment, the average effluent soluble P concentrations for the AnA and CA SBRs were 0.4 and 1.0 mgP/L respectively, and complete removal of influent acetate was observed. During the Loading Pattern #2 experiment, the average effluent soluble P concentrations for the AnA and CA SBRs were 0.3 and 0.9 mgP/L respectively, but effluent acetate was detected after the first high COD loading cycle following the low weekend COD loading period. During the Loading Pattern #3 experiment, the VSS content of both reactors dropped sharply, effluent acetate breakthrough occurred, and effluent P concentrations exceeding 1 mgP/L were detected in both the AnA and CA SBRs. Based on these findings, the AnA process has potential as a technologically and economically superior alternative for wastewater treatment plants treating P-deficient wastewaters to meet stringent effluent TSS and P limits.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864702784246720

Publication date: 2002-01-01

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