Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Effect of Temperature on Water Quality Improvement of Natural Plant-Mineral Composites (PMC) in a Eutrophic Lake, Lake Shingal, Korea

부영양 신갈지에서 천연물질 혼합제(PMC)의 수질개선능: 현장수온의 영향

  • Received : 2013.04.06
  • Accepted : 2013.06.05
  • Published : 2013.06.30
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Abstract

We examined the effect of different field temperatures on water quality improvement (WQI) of natural domestic plant-mineral composites (PMCs). This method was previously used by Kim et al. (2011), to monitor the restoration of water quality of a eutrophic lake, Lake Shingal (Korea). Results indicate that PMCs on phytoplankton, BOD and phosphorus showed more than 70% WQI below $20^{\circ}C$, and less than 40% WQI over $25^{\circ}C$, respectively. The WQIs of PMCs on blue-green algae were gradually decreased with the increase of temperature, whilst diatoms exhibited more than 90% higher WQIs, regardless of water temperature. Additionally, the WQIs on bacterial biomass and total nitrogen were low at all temperatures. These results collectively indicate that water quality improvement activity of plant-mineral composites was dependent on the water temperature, and that the field application of above chemical during temperatures over $25^{\circ}C$, would be less effective in treating a cyanobacteria bloom dominated by Microcystis aeruginosa, than by diatoms.

부영양호 신갈지의 수질개선을 위하여 이미 개발된 천연물질 혼합제(PMC)의 수질개선능(WQI)에 수온변화가 어떠한 영향을 미치는지 현장실험을 실시하였다. 실험결과 식물플랑크톤, BOD, 총인 등은 $20^{\circ}C$ 이하에서는 70% WQI 이상을 보였으나 $25^{\circ}C$ 이상에서는 40% WQI 이하로 오히려 감소하였다. 한편 수온의 증가에 따라 남조류에 대해서는 WQI는 감소하였고, 규조류는 수온변화에 상관없이 90% 이상 높은 WQI를 나타냈으며, 박테리아와 총 질소는 수온과 상관없이 매우 낮은 WQI를 보였다. 이상의 결과들은 PMC의 수질개선능이 수온과 밀접한 관계를 가지며, $25^{\circ}C$ 이상의 고온기에 Microcystis aeruginosa가 우점하는 남조대발생보다 겨울철 저온기에 우점하는 규조류에 더 효과적일 것으로 판단되었다.

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