Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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The Effects of Residual Al on Plankton Community after Dissolved Air Flotation (DAF) Application

가압부상 후 잔류 응집제가 플랑크톤 군집에 미치는 영향

  • 김호섭 (국립환경과학원 한강물환경연구소) ;
  • 공동수 (국립환경과학원 한강물환경연구소) ;
  • 이형진 (국립환경과학원 한강물환경연구소) ;
  • 신종규 (국립환경과학원 한강물환경연구소) ;
  • 강태구 (국립환경과학원 한강물환경연구소)
  • Received : 2007.10.01
  • Accepted : 2007.10.25
  • Published : 2007.11.30
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Abstract

This study was conducted to test the effect of residual Al on plankton community after dissolved air flotation (DAF) application. Growth rate of phytoplankton after DAF application ($0.37day^{-1}$) was about 2 times lower than that before DAF application ($0.70day^{-1}$). Under the condition of addition of nitrogen and phosphorus without light, growth rate phytoplankton in treatment without residual Al increased in difference with showing the negative growth rate in treatment with residual Al. Under the condition of light without addition of nutrient, growth rate of phytoplankton was no noticeable difference between the before and after DAF application. The relatively high settling rate (0.47 m/day) was observed in treatment after DAF application. Although the abundance of rotifer decreased, the abundance of copepod and cladoceran such as Daphnia galeata, Diaphanosoma sp. and Bosmina longirostris with relative higher grazing was no noticeable difference between the before and after DAF application. In the treatments before and after DAF application with zooplankton, growth rate of phytoplankton was $0.41{\pm}0.08day^{-1}$, $0.20{\pm}0.03day^{-1}$, respectively. This difference was in treatment after DAF application similar with those in treatments before and after DAF application without zooplankton. Those indicate that the filter-feeding effect of zooplankton on phytoplankton community may be not changed by residual Al after the DAF application. These results suggest that residual Al after DAF application be to improve water quality by inhibition of growth rate as well as increasing settling rate of phytoplankton.

Keywords

Acknowledgement

Supported by : 한강수계관리위원회

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