Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Effects of Submerged Aerator on the Growth of Algae in Daechung Reservoir

대청호에 설치된 수중폭기시설이 조류 발생에 미치는 영향

  • Oh, Kyoung-Hee (Department of Environmental Engineering, Chungbuk National University) ;
  • Jeong, Dong-Hwan (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Yang, Sang-Yong (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Jeon, Tae-Wan (Geum River Environment Research Center, National Institute of Environmental Research) ;
  • Cho, Young-Cheol (Department of Environmental Engineering, Chungbuk National University)
  • 오경희 (충북대학교 환경공학과) ;
  • 정동환 (국립환경과학원 금강물환경연구소) ;
  • 양상용 (국립환경과학원 금강물환경연구소) ;
  • 전태완 (국립환경과학원 금강물환경연구소) ;
  • 조영철 (충북대학교 환경공학과)
  • Received : 2013.02.12
  • Accepted : 2013.04.09
  • Published : 2013.04.30
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Abstract

To evaluate the effects of submerged aerators installed at Chudong and Muneui areas in Daechung Reservoir on improvement of water quality and reduction of algal bloom, the water quality was monitored at the effected and control areas at the time of operation. The water temperature and concentrations of dissolved oxygen, total phosphorus, and total nitrogen in depth at the effected and control areas were not different each other, indicating the submerged aerators at these areas are not effective for circulation of water body and reduction of nutrients. In warmer season, the concentrations of total phosphorus in deep water, which was probably released from contaminated sediment or inflowed from watershed, was high. To decide the operation of aerators in this season, the concentration of total phosphorus in water should be considered because the dispersed phosphorus by operation of aerators can enhance the algal growth.

대청호의 추동과 문의수역에 설치된 수중폭기시설의 수질 개선 및 조류저감 효과를 평가하기 위하여, 폭기시설의 영향지점과 대조지점에서 시설의 가동 전 후 수질을 분석하였다. 분석 결과, 폭기지점과 대조지점에서 수심에 따른 수온 및 용존산소의 농도 차이는 거의 없었으며, 조류의 주요 성장인자인 총인과 총질소의 농도도 거의 차이가 없었다. 이러한 결과로부터 추동과 문의수역에서 폭기시설에 의한 수체 순환 및 영양염류 저감 효과가 크지 않은 것으로 판단되었다. 하절기에 심층의 총인 농도가 매우 높았으며, 이는 오염된 퇴적물로부터 용출되었거나 강우에 의해 외부로부터 유입된 것으로 판단되었다. 이 시기에 폭기시설을 가동할 경우 총인이 확산되어 조류의 성장을 촉진시킬 수 있으므로, 폭기시설의 가동 시기를 결정할 때 이를 고려하여야 한다.

Keywords

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