Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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The Application of an Algal Fence for the Reduction of Algal Intake into the Water Intake Facility

조류펜스의 조류 저감 효과에 대한 실험적인 평가

  • Jang, Min-Ho (Dept. of Biology, Pusan National Univ, School of Biological and Biomedical Science, Univ. of Durham) ;
  • Park, Sung-Bae (Dept. of Biology, Pusan National Univ) ;
  • Jung, Jong-Mun (Dept. of Biology, Pusan National Univ, Busan Water Quality Institute, Busan Waterworks HQ, S. Korea) ;
  • Roh, Jae-Soon (Dept. of Biology, Pusan National Univ, Busan Water Quality Institute, Busan Waterworks HQ, S. Korea) ;
  • 정광석, Kwang-Seuk (Dept. of Biology, Pusan National Univ) ;
  • Joo, Gea-Jae (Dept. of Biology, Pusan National Univ)
  • 장민호 (부산대학교 생물학과) ;
  • 박성배 (부산대학교 생물학과) ;
  • 정종문 (부산대학교 생물학과, 부산광역시 상수도 사업본부 수질연구소) ;
  • 노재순 (부산대학교 생물학과, 부산광역시 상수도 사업본부 수질연구소) ;
  • 정광석 (부산대학교 생물학과) ;
  • 주기재 (부산대학교 생물학과)
  • Published : 2003.12.31
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Abstract

In this study, an algal fence was developed and applied to reduce the input of algal scum into the water intake facility. The effectiveness of vertical algal fences(overlapped three types of meshes, (312 ${\mu}m$ ${\times}$ 375 ${\mu}m$, 390 ${\mu}m$ ${\times}$ 450 ${\mu}m$, and 0,7 cm ${\times}$ 1cm; vertical depth, 1.5 m; length of fence, about 120 m)) was experimentally tested at a water intake facility (Mulgum, lower Nakdong River). The application of the fence resulted in the statistically significant difference of algal biomass between inside and outside of the fence. According to ANOVA test, chi. a concentration in Day-1showed large difference at each depth of 0, 1, 2 m (0.001> p at each depth, n = 16 respectively). Especially large difference was observed at 0 and 1 m depth. However, the fence was only effective for a short period and its efficiency declined by Day-5after the installation. When better maintenance options for the fence are prepared, e.g. mechanical installation and periodic backwashing of the fence, the performance of algal fence may be sustained. In addition, reliable models for bloom prediction are required to provide an advanced indication of the optimal timing for the installation so that effective operation would be achieved.

본 연구에서는 상수원수 취수장의 취수구로 유입되는 조류 군체의 양을 물리적으로 억제할 수 있는 조류 펜스를 개발하고, 현장에 적용 및 평가하였다(2001년 6-9월). 펜스를 설치한 후 펜스 안팎의 식물플랑크톤 생체량은 통계적으로 유의한 차이를 나타내었다. 분산 분석의 결과 설치 1일 후의 chl. a는 모든 수심 (0, 1,2 m)에서 유의한 차이를 보였으며 (모든 수심에서 0.001 > p ,각 수심별 r= 16), 특히 표층과 수심 1m에서 가장 큰 차이를 보였다. 하지만 조류 저감 효과는 설치 후 3-5일이 지나면서 감소하였다. 조류 펜스의 물리적 유입 저감 효과의 지속성 유지를 위해서는 효과적인 설치 및 유지관리 방안(예, 기계적인 설치 및 주기적인 역세척 등)이 모색되어야 하며, 생태 모형을 이용하여 대번성 시기 예측이 가능할 경우 훨씬 효과적으로 조류의 유입 차단이 가능할 것으로 보인다.

Keywords

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