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[Effect of the COD and total phosphorus concentration on biological phosphorus removal supplied with acetate as a
Wenquan Ruan1, Hua Zou, Jian Chen
1Key Laboratory of Industrial Biotechnology, Ministry of Education, Southen Yangtze University, Wuxi, 214036, China.
Abstract:
The effect of the concentration of acetate and total phosphorus on biological phosphorus removal process in sequencing batch reactor fed with sodium acetate (as sole carbon source) was studied in this paper. The reason of the inefficiency of phosphorus removal by sludge fed with high concentration acetate solution was analyzed. The results indicated that when COD < 600 mg.L-1 the phosphorus removal increased with the increase of COD/TP; and this removal increased obviously when COD/TP < 50 but not when COD/TP > 50. The phosphorus removal descended at high acetate concentration (COD > 600 mg.L-1) and broke down when COD > 1000 mg.L-1. It is the transmission of high acetate concentration from the anaerobic stage to the aerobic stage that led to the proliferation of the filamentous microorganism and the expansion of sludge, then polyP bacteria was wash out, which resulted in the drop of phosphorus removal.