Effect of operating parameters on anoxic biological phosphorus removal in anaerobic anoxic sequencing batch reactor

Environmental Technology
M MerzoukiM Benlemlih

Abstract

Optimizing anoxic biological phosphorus removal in the anaerobic-anoxic sequencing batch reactor (A2 SBR) was observed to depend greatly on three parameters: the amount of added nitrate, the sludge retention time (SRT) and the phosphorus/carbon feeding ratio (P/C, wt/wt). The concentration of 120 mg N-NO3 l-1 in the anoxic medium corresponding to 800 mg COD l-1 acetic acid and 60 mg P-PO4 l-1 in the synthetic wastewater, the SRT of 15 days and the P/C feeding ratio of 20/100 were determined as optimal for complete phosphorus removal in the A2 SBR. The acetate uptake, the phosphorus release and the phosphorus removal increased with the P/C feeding ratio and the phosphorus sludge content (Ps). The polyphosphate-accumulating organisms (PAO) were dominant under operation at all P/C feeding ratios tested except 2/100. At a P/C feeding ratio of 20/100, PAO could accumulate a high content of polyphosphate compared with other P/C ratios. In contrast, the P/C ratio of 2/100 caused a decrease in the polyphosphate content in PAO, the deterioration of enhanced biological phosphorus removal (EBPR) activity, and the dominance of glycogen-accumulating organisms (GAO). This study was completed by microscopic observations which revealed three m...Continue Reading

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