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Effects of Operation Parameters on Pollutants Removal in a Lab-Scale Multi-Layered Soil Filtration System

하천 수질정화를 위한 실험실 규모 다단식 토양여과 시스템에서 오염물질 제거에 미치는 운전인자의 영향

  • Won, Se-Yeon (Center for Water Resource Cycler Research Center, Korea Institute of Science and Technology) ;
  • Ki, Dong-Won (Department of Civil, Environmental and Sustainable Engineering, Arizona State University) ;
  • Yoon, Min-Hyeok (Center for Water Resource Cycler Research Center, Korea Institute of Science and Technology) ;
  • Maeng, Sung-Kyu (Department of Civil and Environmental Engineering, Sejong University) ;
  • Ahn, Kyu-Hong (Center for Water Resource Cycler Research Center, Korea Institute of Science and Technology) ;
  • Park, Joon-Hong (School of Civil and Environmental Engineering, Yonsei University) ;
  • Song, Kyung-Guen (Center for Water Resource Cycler Research Center, Korea Institute of Science and Technology)
  • 원세연 (한국과학기술연구원 물자원순환연구단) ;
  • 기동원 (아리조나주립대학교 토목환경공학과) ;
  • 윤민혁 (한국과학기술연구원 물자원순환연구단) ;
  • 맹승규 (세종대학교 건설환경공학과) ;
  • 안규홍 (한국과학기술연구원 물자원순환연구단) ;
  • 박준홍 (연세대학교 사회환경시스템공학부) ;
  • 송경근 (한국과학기술연구원 물자원순환연구단)
  • Received : 2011.04.15
  • Accepted : 2012.02.24
  • Published : 2012.02.29

Abstract

In this study we investigated the effects of operational parameters of a multi-layered soil filtration (filter depth, filtration velocity, and continuous/intermittent operation) on removal of pollutants in river water. As filter depth increased removal of all the pollutants (COD, TP, TN, and $NH_4$-N) was increased because the increase in filter depth increased in contact time between media and pollutants. The removal of TP and $NH_4$-N more increased with the increase in filter depth, comparing to the biological COD removal which was performed only in the top layer, since the removal mechanism of TP and $NH_4$-N was physicochemical process occurring throughout the whole layers. However, the reduction in filtration velocity resulted in decrease of removal all the pollutants removal due to shorter retention time. Biological COD removal was more influenced with the reduction in filtration velocity (longer retention time), than the removal of TP and $NH_4$-N. Because biological process was occurred only in the top layer which has relatively shorter retention time, comparing with physicochemical process occurred throughout whole media. Therefore, it is desirable that the operation parameters be controlled toward increasing retention time, in order to achieve efficient pollutants removal. The change in operation mode (continuos vs. intermittent operations) did not provide significant effects on the pollutant treatment efficiency by the multi-layered soil filtration system. Our findings suggest that for stable long-term operation it should be considered keeping conditions for biological activity and accelerating clogging.

Acknowledgement

Supported by : 환경부

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