| Title |
Organic and Phosphorus Removal by a New Biological Process with a Single Reactor |
| Authors |
최용수 ; 신응배 ; 이영대 ( Yong Su Choi ; Eung Bai Shin ; Young Dae Lee ) |
| Abstract |
Experimental study for the removal of organic and phosphorus in synthetic wastewater was conducted in a single reactor including anaerobic-anoxic-aerobic zone and clarifier. Attempts were made to delineate phosphorus removal mechanisms and to evaluate the removal efficiencies of organic and phosphorus with different internal recycle ratios, N/P ratios and various SRT conditions. The removal efficiencies of TOC, BOD and COD were observed to be higher than 95%, 90% and 90% respectively with aerobic recycle rates of 100% and 200%. It was recognized that the optimal operational condition for phosphorus removal was the aerobic internal recycle rate of 100% with the inlet fraction 0.2. The percent removal efficiencies were 92.1% for T-P and 90.1% for PO-4-P. While, large differences in the removal of phosphorus with N/P ratios were observed; at influent TKN/T-P of 2.5, 3.6 and 5.1, removal efficiencies for T-P were 88.7%, 67.6% and 55.9%, respectively. Those removal efficiencies decreased with the increase of N/P ratio in wastewater charged. In case of SRT, removal rates of 93.5% for T-P and 92.1% for PO₄-P were observed with the solid retention time of l0 days. These rates are higher than results in 5 days and 20 days of SRT. Thus high removal efficiencies for organic substances and phosphorus in wastewater were simultaneously obtained by a new biological process with a single reactor. |