| Title |
Efficiency of Nutrients Removal in a Microbial Contact Oxidation System Covered with Soil |
| Authors |
최철호 ( Chul Ho Choi ) ; 이승목 ( Seung Mok Lee ) ; 윤종화 ( Jong Hwa Yoon ) ; 황필기 ( Pil Gi Hwang ) ; 김정용 ( Jung Yong Kim ) |
| Keywords |
Contact oxidation system covered with soil; Contact media; Turf; Basalt rubble; Hydraulic retention time; HRT |
| Abstract |
Nutrients removal performance of a contact oxidation reactor covered with soil was investigated when basalt rubble was used as a contact medium under various operating conditions. The objective of the experiment was to determine the effectiveness of the system by measuring the removal efficiencies of nutrients from a technical and economical viewpoint. Under the ranges of HRT(20 and 40 hrs) in the experiment, the removal rates of organic matter were as high as 97.5% by showing an effluent BOD_5 of less than 10 ㎎/L. The test of nitrogen removal when the turf was planted on the top soil showed that the average removal rate increased as much as 25% as compared to that without planting. It was suggested that the construction and maintenance cost could be reduced over 20% when the HRT of the system was decreased from 72 to 40 hrs. |