Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Inhibition of the Algal Growth using TiO2-embedded Expanded Polystyrene (EPS) balls in Lab-scale Outdoor Experiment

  • Kim, Ga Young (Environmental Engineering, Hanbat National University) ;
  • Joo, Jin Chul (Civil & Environmental Engineering, Hanbat National University) ;
  • Ahn, Bo Reum (Environmental Engineering, Hanbat National University) ;
  • Lee, Dae Hong (Civil & Environmental Engineering, Hanbat National University) ;
  • Park, Jae Roh (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Ahn, Chang Hyuk (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Oh, Jong Min (Department of Environmental Science and Engineering, Kyung Hee University)
  • Received : 2018.09.12
  • Accepted : 2018.09.27
  • Published : 2018.09.30
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Abstract

$TiO_2$-embedded expanded polystyrene (TiEPS) balls with powdered $TiO_2$ particles embedded on the surface of EPS were developed, and the growth inhibition of Chlorella ellipsoidea, a green algae, was evaluated. The experiment was conducted using four reactors with various conditions of (A) natural sunlight, (B) natural sunlight + TiEPS balls, (C) dark, and (D) dark + TiEPS balls on the roof of the building during five days. Based on the analysis of cell number, cell morphology, concentrations of chlorophyll-a and phaeopigments, both surface reactions in heterogeneous photocatalysis and light shielding could inhibit the growth of C. ellipsoidea. The highly reactive hydroxyl radicals ($OH{\cdot}$) from TiEPS balls degraded the lipid cell membrane through the peroxidation reaction with the light shielding, eventually resulting in cell inactivation. Although dominant inhibitory effects on the growth of C. ellipsoidea were ambiguous, TiEPS balls were feasible to prevent and inhibit the excessive growth of algae in eutrophic water body.

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References

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