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Efficiency of Nutrients Removal in a Microbial Contact Oxidation System Covered with Soil  

Choi, Chul-Ho (Department of Environmental Engineering, Kwandong University)
Lee, Seung-Mok (Department of Environmental Engineering, Kwandong University)
Yoon, Jong-Hwa (Department of Environmental Engineering, Kwandong University)
Hwang, Pil-Gi (Department of Environmental Engineering, Kwandong University)
Kim, Jung-Yong (ToWoo Construction Co. Ltd.)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.1, 2005 , pp. 92-98 More about this Journal
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 mg/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.
Keywords
Contact oxidation system covered with soil; Contact media; Turf; Basalt rubble; Hydraulic retention time(HRT);
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