Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Toxicity Assessment and Evaluation of the Applicability of a Constructed Wetland of Bio-reeds and Bio-ceramics

바이오갈대와 바이오여재를 적용한 인공습지의 효율성 및 독성평가

  • Received : 2017.11.16
  • Accepted : 2017.12.13
  • Published : 2017.12.31
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Abstract

Recently, a low-impact development (LID) technic such as a wetland has been proposed as a Nature-friendly process for reducing pollutants caused by livestock wastewater. Therefore, the Daphnia magna toxicity was analyzed for livestock wastewater samples, to determine if a wetland system would also be effective in reducing this ecotoxicity. In the present study, acute D. magna toxicity was not significantly dependent on the presence and type of reed, nor type of media. However, when treated with construction wetlands, ecotoxicities decreased as well as TN, TP and COD concentrations. Therefore, it is considered that a construction wetland system with bio reeds and bio-media as well as general reeds would be effective to reduce the ecotoxicity of livestock wastewater. To apply a wetland system as the subsequent treatment process to a livestock waste water treatment facility, it is necessary to perform an integrated evaluation such as treatment efficiency and the ecotoxicity test for various characteristics of livestock wastewater.

축산폐수에 기인한 오염 물질 저감을 위해 최근 축산폐수처리 후속공정으로 인공습지와 같은 자연친화적인 처리법이 제안되고 있다. 따라서 본 연구는 자연친화적 공법이 수생태독성 저감에도 효과적인지 알아보기 위해 다양한 공정의 인공습지를 제작하여 축산폐수 시료를 대상으로 처리 전후 오염저감율 및 물벼룩 급성 독성 변화를 분석하였다. 본 실험결과, 비록 갈대의 유무 및 종류, 그리고 여재의 종류에 따른 영향은 없으나 인공습지에 처리된 경우 유입수에 비해 TN, TP, COD 농도 저감과 더불어 생태독성 영향이 감소하였다. 따라서 일반 갈대는 물론 바이오갈대와 바이오여재를 사용한 인공습지는 축산폐수의 TN, TP, COD 저감은 물론 생태독성 감소에도 효과적인 공법으로 판단된다. 향후 가축분뇨 정화시설과 연계한 후속처리공정으로 적용하기 위해서는 다양한 성상의 축산폐수를 대상으로 처리효율과 생태독성시험이 연계된 통합평가가 필요한 것으로 사료된다.

Keywords

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