상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제28권1호
  • /
  • Pages.47-54
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  • 2014
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  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
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실리카 나노입자에 의한 활성슬러지 활성도 저해 효과 분석

Inhibition effect of silica nanoparticle on the oxygen uptake rate of activated sludge

  • 이수미 (세종대학교 환경에너지융합학과) ;
  • 조진우 (세종대학교 환경에너지융합학과)
  • Lee, Soo Mi (Department of Environment & Energy, Sejong University) ;
  • Cho, Jin Woo (Department of Environment & Energy, Sejong University)
  • 투고 : 2014.01.14
  • 심사 : 2014.02.10
  • 발행 : 2014.02.15
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초록

Nanotechnology has become one of the fastest developing technologies and recently applied to a variety of industries. Thus, increasing number of nano materials including various nanoparticles would be discharged into wastewater and consequently entering a biological wastewater treatment process. However, the impact of the nano particles on biological wastewater treatment has not been estimated intensively. In this research, we investigated the effect of silica nanoparticle on the oxygen uptake rates (OURs) of activated sludge used in a conventional wastewater treatment process. The inhibition (%) values were estimated from the results of OURs experiments for the silica nanoparticles with various sizes of 10-15, 45-50, and 70-100 nm and concentrations of 50, 250, and 500 ppm. As results, the inhibition value was increased as the size of silica nano particles decreased and the injected concentration increased. The maximum inhibition value was investigated as 37.4 % for the silica nanoparticles with the size of 45-50 nm and concentration of 50 ppm. Additionally, the effect of size and concentration on the inhibition should be considered cautiously in case that the aggregation of particles occurred seriously so that the size of individual particles was increased in aquatic solution.

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