Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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An Investigation into the Release of Chemical Oxygen Demand in Organic Filter Media

유기성 여재로부터 화학적 산소요구량 물질의 방출에 관한 연구

  • Guerra, Heidi B. (Department of Environmental Engineering, Hanseo University) ;
  • Kim, Youngchul (Department of Environmental Engineering, Hanseo University)
  • Received : 2020.05.03
  • Accepted : 2020.05.27
  • Published : 2020.08.31
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Abstract

To improve the nitrogen reduction capability of stormwater treatment systems subjected to intermittent saturation, organic materials are often added as filter media. However, these materials can be an additional source of organic carbon and increase the chemical oxygen demand (COD) in the outflow. In this study, different types of organic filter media were subjected to a batch leaching test to observe and quantify the release of COD. Results reveal that the initial pH of the tap water used for soaking which is 7.5-7.7 is conducive to the release of organics from the media to the leachate. The highest amount of COD released was observed in yard clippings and woodchip followed by compost and bark mulch. The leaching of organics also increased as the size of the media decreases due to higher surface area per volume. In addition, empirical regression analysis predicted that COD from these organic media will be exhausted from the material in 3-5 months to up to 26 months depending on the type of media. The results of this study can serve as a guide in estimating the potential release of COD in organic media in order to ensure their safe application in stormwater treatment facilities.

강우시에 주기적으로 포화상태에 이르는 강우 유출수 처리시스템에 의한 질소저감 능력을 향상시키기 위하여 유기성 여재가 널리 적용되고 있다. 그러나 이와 같은 물질은 추가적인 유기탄소원이 되기도 하지만 처리수의 COD를 증가시키는 원인이 되기도 한다. 본 연구에서는 여러 가지 형태의 유기성 여재의 회분식 용출시험을 통하여 COD 방출량을 정량화하고자 하였다. 연구결과에 따르면 초기 pH가 7.5-7.7인 수돗물 수준에서 쉽게 유기물질이 용출되는 것으로 나타났다. COD 방출이 가장 큰 여재는 노지 벌초물(yard clipping)과 우드칩이었으며 다음으로 퇴비와 목피 순서로 나타났다. 또한 여재의 크기가 작으면 작을수록 비표면적의 증가로 인하여 방출량이 증가하였다. 연구결과로부터 도출된 경험적인 공식에 따르면 유기성 여재로부터 COD 방출은 여재형태에 따라 3-5개월에서 길게는 26개월이 지속되는 것으로 예측되었다. 이와 같은 연구결과는 강우유출수 처리시설에서 유기성 여재의 안전한 적용을 위한 잠재적인 COD 물질의 방출량을 계산하는데 기여할 것으로 사료된다.

Keywords

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