Study on pH value effect on removal of biological phosphorus in anaerobic pool

From theoretic and operation, under A/O process, the pH of anaerobic ettect on biological phosphorus removal is discussed and analyzed in this paper. The results showed that under anaerobic conditions, with pH increased from 6.0 to 7.5, the concentration of phosphorus also increases. When pH is 7.5, the concentration of phosphorus arrives it's top. Increasing pH along, the concentration of phosphorus will decrease. If activated sludge was recycled to first settle and organic matter was separated, the pH of anaerobic decrease is useful for anaerobic P-release.