Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Evaluation of Filtration and Backwash Efficiency of Non-point Source Pollution Reduction Facility

장치형 비점오염원 저감시설의 여과 및 역세 효율 평가

  • Yun, Sangleen (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Lee, Yong-Jae (N4TECHDS CO., LTD.) ;
  • Ahn, Jae-Hwan (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Choi, Won-Suk (N4TECHDS CO., LTD.) ;
  • Lee, Jungwoo (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Oh, Hye-Cheol (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Seog-Ku (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 윤상린 (한국건설기술연구원 환경플랜트연구소) ;
  • 이용재 (엔포텍디에스) ;
  • 안재환 (한국건설기술연구원 환경플랜트연구소) ;
  • 최원석 (엔포텍디에스) ;
  • 이정우 (한국건설기술연구원 환경플랜트연구소) ;
  • 오혜철 (한국건설기술연구원 환경플랜트연구소) ;
  • 김석구 (한국건설기술연구원 환경플랜트연구소)
  • Received : 2017.11.15
  • Accepted : 2017.12.05
  • Published : 2017.12.31
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Abstract

Non-point source pollution is the emission source that unspecifically releases pollutants to water system from unspecific places such as cities, agricultural lands, mountains, and construction sites and its discharge path is not easily identified. Also, it is difficult to design and manage the reduction facilities for the emission quantity is primarily affected from weather conditions like rainfall. Since 2006, the significance of non-point source pollution reduction has been grown in Republic of Korea and this reinforces needs for the installation of reduction facilities. However, because the standards for the installation details and reduction efficiency are not clarified by law, people are preferring technologies that do not require particular maintenance and high expenses. The purpose of this study is to examine and maintain the efficiency of non-point source pollutants reduction facility which uses expended polypropylene as a media. The higher the depth of the media, the less range of variations in the reduction efficiency was observed and the final efficiency was also increased. When the media depth was 60 cm, the average reduction efficiency was 94% and 90% where linear velocities were 10 m/hr and 20 m/hr respectively. The results from 180 minutes operation in 10 m/hr and 20 m/hr of linear velocities were slightly different in head loss changes which were caused by media depth variations. The backwash experiments which were conducted in triplicate showed the reduction efficiency decreased as the time went on because of the media clogging. However, it was found that after the backwashing the reduction efficiency was increased as effective as the efficiency of the initial filtration.

비점오염원은 도시, 도로, 농지, 산지, 공사장 등 불특정장소에서 불특정하게 수계에 오염물질을 배출하는 배출원으로, 오염물질의 유출경로가 명확하게 구분되지 않는다. 또한 수집이 어렵고 배출량이 강수량 등 기상조건에 크게 좌우되기 때문에 저감시설의 설계 및 유지관리가 어려운 측면이 있다. 한국의 경우 2006년 이후 비점오염원 처리에 대한 중요성이 심화되어 설치의무는 강화되고 있으나, 설치기준 및 효율에 대한 명확한 기준이 제시되지 못하여 단순히 저렴하며 유지관리가 필요치 않은 처리기술을 선호하고 있는 실정이었다. 본 연구는 발포고분자여재(Expended Polypropylene Media, EPP)를 이용한 여과형 비점오염원 저감시설에 대하여 처리능과 역세척에 의한 처리능의 유지에 대한 연구를 진행하였다. 여재층 높이가 증가할수록 처리효율의 변화폭은 줄었으며, 처리효율은 상승하는 것으로 나타났다. 60 cm의 여재층 높이에서 10 m/hr의 선속도의 경우 평균 처리효율은 94%로 나타났으며, 20 m/hr의 선속도의 경우 평균 처리효율이 90%로 나타났다. 여과 선속도 10 m/hr와 20 m/hr에서 180분 동안 운전 결과, 손실수두의 변화는 여재층 높이에 따른 차이가 조금 다른 양상으로 나타났다. 총 3회 반복한 역세척 실험 동안 여과시간이 경과함에 따라 처리효율은 여재가 폐색됨에 따라 감소하는 경향을 나타났다. 그러나 역세척 과정 이후에는 이전 여과과정의 초기 시점의 처리효율과 거의 유사하게 회복하는 것으로 확인하였다.

Keywords

Acknowledgement

Supported by : 한국건설기술연구원

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