Abstract
Bench scale and pilot plant studies were conducted using anoxic anaerobic and aerobic reactor sequence for enhanced biological phosphorus removal. The influent quality and operational characteristics such as return sludge, food-to-microorganism (F/M) ratio, and mean cell residence time varied greatly in these studies. The data collected over a 10-year period for phosphorus removal was analyzed with respect to many parameters. A strong relationship between the concentration of soluble 5-day biochemical oxygen demand (BOD\d5) in the mixture of the influent and return sludge, phosphorus release in the anoxic and aerobic reactors, and phosphorus uptake in the aeration basin was observed. The total phosphorus (TP) removal was greatly influenced by the availability of biodegradable carbon in high enough concentration in the mixture. Two statistical curves between average BOD\d5 of the mixture and total phosphorus removal have been fitted with excellent results. More than 90% total phosphorus removal is achieved when the soluble BOD\d5 of the mixture is over 120 to 125 mg/L.
Published Version
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