Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Long-term Performance of Secondary dam Installed for Water Purification of Reservoir

호소의 수질개선을 위하여 설치한 부댐의 장기간 성능평가

  • Kim, Bong-Kyun (Dong San Bio Concrete R&D Center, Dong San Concrete Industry Company) ;
  • Park, Jun-Seok (Dong San Bio Concrete R&D Center, Dong San Concrete Industry Company) ;
  • Won, Hee-Jae (Dong San Bio Concrete R&D Center, Dong San Concrete Industry Company) ;
  • Kim, Yun-Yung (Dept. of Civil Engineering, Chungnam National University)
  • 김봉균 (동산콘크리트산업(주) BIO콘크리트연구소) ;
  • 박준석 (동산콘크리트산업(주) BIO콘크리트연구소) ;
  • 원희재 (동산콘크리트산업(주) BIO콘크리트연구소) ;
  • 김윤용 (충남대학교 토목공학과)
  • Received : 2018.07.23
  • Accepted : 2018.10.05
  • Published : 2018.10.31
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Abstract

Most reservoirs in Korea have a low water depth and are small in size. Water pollution of the reservoir is serious because of the organic matter flowing from livestock wastewater, domestic sewage, and farmland. In this study, an attempt was made to improve the water purification effect by replacing the secondary dam installed in the depression area of the agricultural reservoir with the riprap dam. To evaluate the long-term performance, a riprap dam was installed in a reservoir in Gyeonggi province and water purification effect for 36 months was measured. The field test results showed that COD was 14.6%, SS 38.6%, T-N 9.5%, and T-P 11.2%. The concentrations in the influent water exhibited a significant change according to season, and the water purification effect increased with increasing concentration of influent water. The pollutant flowing into the lake from the depression area can be blocked effectively if the secondary riprap dam for water purification is installed in the agricultural reservoir.

우리나라의 저수지는 유효수심이 낮고 소규모의 인공호소가 대부분이어서 주변의 농경지로부터 유입되는 유기물질과 축산폐수 및 생활하수에 의한 수질오염에 취약한 실정이다. 이에 여러 가지 공법을 통하여 이를 개선하고자 노력하고 있으나 여전히 저수지의 오염정도가 심각한 실정이다. 따라서 본 연구에서는 저수지의 유입부에 설치되는 침강지를 조성하기 위한 사석 위주의 부댐을 대체하면서 수질정화 효과를 부여하기 위하여 수질정화용 부댐을 경기도내 저수지에 설치하여 36개월간 수질개선효과를 측정하였다. 연구결과에 따르면 COD 14.6%, SS 38.6%, T-N 9.5%, T-P 11.2%로 나타났으며 계절 등 시기별로 유입수의 농도 변화가 뚜렷하였고 유입수의 농도가 높을수록 수질정화효과가 높게 나타났으며 36개월의 장기간 운영에 따른 여재의 공극 막힘 현상은 발생하지 않았다. 따라서 침강지의 정화효율이 아닌 부댐의 정화효율임을 고려하여 볼 때 수질정화용 부댐을 농업용 저수지에 설치할 경우 장기간 동안 침강지로부터 호소내로 유입되는 오염물질을 효과적으로 차단하여 호내의 수질오염을 방지할 수 있을 것으로 판단된다.

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