대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제39권8호
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  • Pages.478-488
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  • 2017
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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세라믹 여재를 활용한 상향류식 여과형 비점오염저감시설의 최적 운전 및 역세척 조건

Optimization of Operation and Backwashing Condition for an Upflow Stormwater Filtration System Utilizing Ceramic Media

  • 황유훈 (서울과학기술대학교 환경공학과) ;
  • 서영교 (서울과학기술대학교 환경공학과) ;
  • 김효원 (서울과학기술대학교 환경공학과) ;
  • 노건완 ((주) C&C) ;
  • 신현상 (서울과학기술대학교 환경공학과) ;
  • 김도군 (경희대학교 사회기반시스템공학과)
  • Hwang, Yuhoon (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Seo, Younggyo (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, Hyowon (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Roh, Kunwan (C&C Inc.) ;
  • Shin, Hyunsang (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Kim, Dogun (Department of Civil Engineering, Kyunghee University)
  • 투고 : 2017.07.18
  • 심사 : 2017.08.16
  • 발행 : 2017.08.31
⟨ 이전 논문 다음 논문 ⟩

초록

도로변 등에 여과형 강우유출수 처리시설이 많이 이용되고 있으나, 유지관리의 최소화, 성능의 검증 및 최적 조건의 수립이 선행되어야 한다. 본 연구에서는 강도가 우수하고 성형이 용이한 세라믹 여재를 사용하고, 하단 지지부와 상단의 여과조로 이루어진 상향류식 여과 시스템을 구성하고, SS 제거능과 역세척 조건을 검토하여, 최적 운전 조건을 설정하였다. 여과 선속도 20-40 m/h 조건에서 운전하였을 때, 총 고형물 부하 $30kg/m^2$에 이르는 조건에서도 최대 수두 손실 상승이 3 cm 내외이었으며, SS 처리 효율이 96% 이상으로, 안정적인 운전이 가능하였다. 운전 중의 손실수두와 여재층 공극률은 급수 모델에 의해 모사가 가능하였다. 특히, 하단 지지부에서 일정 입도 이상의 SS가 상당량 제거되어, 여과조에 부하를 감소시킬 수 있음을 확인하였다. 최적의 역세척 조건을 설정하기 위하여 공기 및 수세척의 시간과 유량, 그리고 정체수 배출 공정의 유무에 따른 영향을 확인하였으며, 실험한 모든 조건에서 만족할 만한 손실수두의 회복을 달성할 수 있었다. 다만, 역세척 직후 SS의 배출을 최소화하기 위해서는 공기세척과 수세척 공정 사이에 정체수 배출 공정의 도입이 효과적인 것으로 파악되었다. 본 연구에서 설정한 역세척 조건을 적용하였을 때, SS 부하 $400-450kg/m^2$의 여재층이 성공적으로 세척될 수 있어, 장기운전이 충분히 가능할 것으로 판단된다.

Stormwater filtration is widely used for the urban runoff treatment. However, intensive maintenance and lack of information about the performance have resulted in an increased need of proper evaluation. In this study, the performance of an upflow stormwater runoff filtration system, consisting of a supporting unit and a filtration unit filled with a ceramic media, was investigated. The maximum head loss increase was about 3 cm under the suspended solid (SS) load of $30kg/m^2$ and the SS removal was more than 96%, when the filtration velocity was 20-40 m/h. The head loss and the porosity of the media can successfully be described by a power model. It was confirmed that the a significant amount of SS can effectively be removed at supporting unit, minimizing SS load to the filter media bed. Several backwashing strategies have been tested to establish the optimum condition. It was found that the stagnant water discharge is important to minimize the SS release immediately after backwashing. Also, the filter bed loaded with $400-450kg/m^2$ SS can almost completely be washed to reduce the head loss to the that of empty bed. The results in this study indicate that the upflow ceramic media filter is an excellent alternative to stormwater treatment, with high SS removal and long lifespan.

키워드

과제정보

연구 과제 주관 기관 : 서울과학기술대학교

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