Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Water Quality Improvement of Pocheon Stream Using Freshwater Bivalves: Development and Operation of Continuous Removal of Organic Matter in Streams (S-CROM)

포천천 수질개선을 위한 패류의 이용 하천형 유기물 제어(S-CROM) 기술의 적용

  • Kim, Baik-Ho (Department of Environmental Science, Kon-kuk University) ;
  • Lee, Ju-Hwan (Department of Environmental Science, Kon-kuk University) ;
  • Kim, Yong-Jae (Department of Biology, Daejin University) ;
  • Hwang, Su-Ok (Paldang Dam Office, Korea Water Resources Corporation) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Kon-kuk University)
  • Published : 2009.09.30
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Abstract

To diminish the levels of organic matters, a novel S-CROM (continuous removal of organic matters in the stream system using freshwater bivalve), was developed and applied to the polluted stream discharging from the wastewater treatment plant, Pocheon stream, Pocheon city (Korea). Major pollutants of the stream were human population and industrial wastewaters. The study was conducted at a small dam constructed within the stream, often called 'bo', and designed with four tanks; no mussels and no sediment (negative control), no mussels and sediment (positive control), 30 mussels and sediment (D1), and 60 mussels and sediment (D2). Physicochemical and biological parameters were measured at 12 hours interval (day and night) after mussel stocking. Results indicated that Anodonta woodiana Lea (D2) clearly removed approximately 72% of chl-$\alpha$ and 57% of suspended solids on second day, however, there were no differences in removal activities between animal densities (P>0.5). Dislike a laboratory CROM system, which previously developed, there were no huge release of nutrient ($NH_3$-N and SRP), due perhaps to the higher flow rate and the lower animal density. Therefore, we may suggest that if we can determine the relevant current and the animal density considering the stream state, an S-CROM system has a strong potential to water quality improvement of eutrophic streams. Some characteristics on both CROM and S-CROM were compared.

패류를 이용한 오염하천의 수질개선 가능성을 확인하고자 CROM기술을 응용한 S-CROM기법을 개발하고 현장에 직접 적용하였다. 실험은 하천에 형성된 소형 보에서 실시하고 자연유속을 그대로 이용하였으며, 패류의 섭식활동을 위해 현장의 퇴적물을 첨가하였다. 실험은 처리조를 현장수(대조군), 현장수+퇴적물(대조군), 현장수+퇴적물+패류 30개체 (D1), 현장수+퇴적물+패류 60개체 (D2) 등 4가지로 구성하고, 유속은 450mL $min^{-1}$, 시료채취는 12시간(주, 야)간격으로 실시하였다. 환경요인으로는 현장에서 직접 수온, pH, DO, 전기전도도, 탁도 등을 측정하였고 시료를 채취하여 Chl-$\alpha$, SS, TN, TP, $NO_2$-N, $NO_3$-N, $NO_4$-N, $PO_4$-P, BOD, 식물플랑크톤 등을 분석하였다. 실험결과 유기물 제어능은 패류밀도와 처리시간에 따라 차이를 보였는데, 최대효과는 운영 2일째, 낮 동안 그리고 고밀도 처리군에서 나타났으며, 부유물질 (57%)과 조류(72%)의 감소를 보였다. 고농도의 암모니아와 인산을 배출하였던 CROM(김 등, 2009)보다 뚜렷하게 낮은 수준을 보였으며, 패류의 밀도효과는 유의하지 않았다. 비록 S-CROM이 CROM에 비하여 낮은 제어율을 보였으나 이는 상대적으로 낮은 패류밀도 및 빠른 유속 등이 원인으로 판단되었다. 따라서 S-CROM를 이용한 하천의 유기물 제어는 하천환경과 패류밀도를 적절하게 조합한다면 높은 수질개선 효과를 기대할 수 있을 것으로 사료되었다.

Keywords

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