
Application of Anaerobic and Aerobic Activated Sludge to Phosphorus-Deficient Wastewater Treatment
Anaerobic and aerobic (AnA) and completely aerobic (CA) sequencing-batch reactors (SBRs) were used to investigate the suitability of the AnA process for treating phosphorus (P)-deficient wastewaters with highly variable influent chemical oxygen demand (COD) loading. Both SBRs were subjected
to influent COD loading patterns (LPs) that simulated (1) daily COD loading fluctuations, (2) weekend shutdowns, and (3) long weekend or holiday shutdowns. During LP 1, the AnA SBR produced lower average effluent soluble phosphorus concentrations than CA SBR (0.4 vs. 1.0 mgP/L). A similar
result was observed during LP 2, but effluent acetate was detected after the first high COD loading cycle of the weekday loading period. During LP 3, the volatile suspended solids content of both reactors dropped sharply, and the effluent quality of both SBRs deteriorated. Model predictions
suggest that the AnA process is stable when treating LP 1, but eventually fails when treating LP 2.
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Keywords: anaerobic/aerobic activated sludge; phosphorus deficiency; polyphosphate
Document Type: Research Article
Publication date: 01 May 2005
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