Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Effects of Plant-mineral Composites (PMC) on the Water Quality, Plankton Community and Microcystin-LR in Eutrophic Waters

식물-광물 혼합제가 부영양 수체의 수질, 플랑크톤 및 microcystin-LR에 미치는 영향

  • Received : 2011.11.29
  • Accepted : 2011.12.17
  • Published : 2011.12.31
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Abstract

We examined two reservoirs (Inkyung res. and Joongang res.) and two streams (Kyungan str. and Jecheon str.), all of which were eutrophic, during the 2010 warm season, to evaluate the water quality improvement activity (WQIA) of plant-mineral composite (PMC), which was previously developed to control suspended solids, including cyanobacterial bloom (Kim et al., 2010). We simultaneously measured both solid (S-MCLR) and dissolved microcystin-LR (D-MCLR), before and after PMC treatment, in the Joongang reservoir. Taking water body size and volume into account, we conducted the whole-scale experiment in the Inkyung reservoir, and mesocosm-scale experiments in the other three systems. The WQIAs of PMC were found to be comparatively high in SS (70~81%), TP (75~91%), BOD (65~91%), Chl-a (88~98%), phytoplankton (84~92%) and zooplankton (68~88%), except for the Kyungan stream, which was below 45% in all parameters. After PMC treatment, the concentrations of both SMCLR (47%) and D-MCLR (96%) decreased within two days, suggesting a mitigation possibility of hazardous chemicals such as agrochemicals and endocrine disrupters in the aquatic ecosystem. Our results collectively indicate that PMC is a useful agent to control suspended solids, including nuisance cyanobacterial bloom and their exudates, in an undisturbed water system with a long residence time.

2010년 고온기 (여름~가을) 동안 수체 크기와 수질이 서로 다른 부영양 하천 (경안천, 제천천) 및 저수지 (인경 저수지, 중앙저수지)의 유기물 제어를 목적으로 기 개발된 식물- 광물 혼합제(PMC)를 동일한 농도($0.05\;mg\;L^{-1}$)로 각각 처리하고 수질, 플랑크톤 변화를 조사하였다. 또한 남조 Microcystis aeruginosa 밀도가 높았던 중앙저수지에서는 동시에 조류 독소 microcystin-LR 변화를 각각 조사하였다. 실험은 수체의 크기를 고려하여 인경저수지를 제외한 나머지 장소에서는 실험용 메조코즘을 설치하였다. 실험결과, 강우와 어류에 의한 교란이 심했던 경안천에서는 모든 항목에 대하여 45% 이하의 낮은 수질개선능을 보인 반면, 수체가 안정되고 남조류 밀도가 높았던 수체에서는 SS (70~81%), TP (75~91%), BOD (65~91%), Chl-a (88~98%), 식물플랑크톤 (84~92%), 동물플랑크톤 (68~88%) 등에 높은 수질개선효과를 보였다. 한편 PMC 처리 후 조체성에 비해 용존성 독소(96%)가 현저하게 감소하여 유해물질 제어 가능성을 나타냈다. 따라서 기 개발된 PMC는 수체 교란이 적고 남조류가 우점하는 수체내 유기물 제어에 적합한 것으로 판단되었다.

Keywords

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