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DOI : ,    Vol.6, No.3, 39 ~ 49, 1998
Title
Acetate Injection into Anaerobic Settled Sludge for Biological P-Removal in an Intermittently-Aerated Reactor
안규홍Kyu Hong Ahn,이형집Hyung Jib Lee
Abstract
Enhancing biological P-removal from wastewater with low COD:P ratio by intermittent injection of acetate into the anaerobically settled sludge layer during settling and decanting periods was studied in an intermittently-aerated cyclic activated sludge process. Injection of acetate induces phosphorus (P) release and uptake by phosphorus accumulating bacteria (PAB). The wastewater used in this experiment was actual domestic wastewater with average concentration of TCODcr = 129.7 ㎎/L, TN = 67.4 mg-N/L, and TP = 6.5 mg-P/L. Effective P-release inside the sludge layer was observed. The P-release capacity of PAB was strongly dependent on the nitrate concentration and the denitrification activity inside the sludge layer. It was concluded that acetate injection into the settled sludge layer can be used as very effective and stable method for inducing P-release, provided certain factors are properly controlled. Other benefits of acetate injection include: (1) better pH control (0.6 higher when acetate injected), (2) maintainenance of stable and high MLSS concentration (5.6 ㎎/L MLSS increase per ㎎/L acetate COD injected, at steady state), and (3) the increase of TN removal rate (0.06 ㎎-N/L additional TN removed per ㎎/L acetate COD injected at steady state).
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