| Title |
Sewage Treatment by the Intermittently Aerated Oxidation Ditch Process |
| Authors |
임연택(Yeon Taek Rim), 서정범(Jeong Beom Seo), 김용석(Yong Seok Kim), 권오상(Oh Sang Kwon), 한기봉(Gee Bong Han), 유재근(Jae Keun Ryu) |
| Abstract |
This study was focused on survey of sewage characteristics and investigation of operational efficiencies in terms of BOD, SS, TN and TP for treatment facility built on on-site apartment building. The oxidation ditch process of 40㎥/day capacity was applied for sewage treatment system. The results of the research showed that earth household had 3.2 dwellers with a sewage flow rate of 242Lpcd in average. The sewage flow rate was particulary low on Saturday and Sunday. The average sewage concentration of BOD, SS, TN and TP were 145㎎/L, 101㎎/L, 33.3㎎/L and 2.8㎎/L, respectively. BOD removal was observed to be 91.7% on average while SS removal to be 77.0% on average. Denitrification/nitrification were accomplished during intermittently aerated processes and removal rate of nitrogen was 50.0% in terms of total nitrogen. Removal efficiency of phosphorus was 47.7% in terms of total phosphorus. The average effluent concentration of BOD, SS, TN and TP were 12.0㎎/L, 19.5㎎/L, 17.0㎎/L and 1.5㎎/L, respectively. Observed microbial yield coefficient was 0.16gMLSS/gBOD. This experiment may prove that intermittently aerated oxidation ditch process can be employed to treat organic matter as well as nutrients in sewage that are generated from such sources as apartment building and community area. |