Biological phosphorus removal from wastewater in a single reactor combining anaerobic and aerobic conditions

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Abstract
In this investigation, phosphorus removal experiment was conducted in a single reactor combining anaerobic and aerobic conditions. Attempts have been made to delineate phosphorus and organic removal mechanisms and to evaluate the removal efficiencies with different internal recycle ratios, NIP ratios and varying SRT conditions. The removal efficiencies of TOC, BOD and COD were observed to be higher than 95%, 90% and 90% in all runs, respectively. It is further estimated that the optimal operational conditions for phosphorus removal are observed when the aerobic internal recycle rate is 100% with the inlet height 0.2H. The percent removal efficiencies were 92% for T-P and 90% for PO4-P. While, large differences in the removal of phosphorus with NIP ratios were observed; at influent TKNrr-p of 2.5, 3.6 and 5.1 removal efficiencies for T-P were 89%, 68% and 56%, respectively. Those removal efficiencies decreased as the NIP ratios increase in wastewater. In case of SRT. high removal efficiencies are observed with the solids retention time of 10 days rather than with SRT's of 5 or 20 days. These results indicate this new process, KNCR (Kist Nutrient Removal Compact Reactor), to be an excellent means of reducing phosphorus emmissions into the environment.

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