Decolorization of Wastewater and Collecting of Sludge from Hanji Production

한지 생산공정에서 발생하는 폐수의 탈색 및 슬러지 회수

  • Choi, Hee-Seon (Department of Chemistry, The University of Suwon) ;
  • Kim, Tai-Jin (Department of Chemical Engineering, The University of Suwon)
  • 최희선 (수원대학교 자연과학대학 화학과) ;
  • 김태진 (수원대학교 공과대학 화학공학과)
  • Received : 1999.12.21
  • Published : 2000.06.25

Abstract

The decolorization of wastewater and the collecting conditions of final sludge from hanji production were investigated. Black wastewater (50 mL) from the process cooking with NaOH could be effectively decolorized by 2.0 g of $Ca(OCl)_2$ So, if excess bleach $Ca(OCl)_2$ used in bleaching process were recycled, the decolorization of wastewater by adding less $Ca(OCl)_2$ would be successfully realized. However, the decolorization by electrolyzed oxidation was ineffective. The final sludge could be effectively collected by polymer coagulator, but the addition of $Al_2(SO_4)_3$ was required, and the pure fibrous sludge could not be collected. Therefore, surfactants such as triethanolamine and Triton X-100 were used instead of polymer coagulator. The collecting yield was obtained about 85% as good as those by polymer coagulator. When mixed surfactants were used in collecting the final sludge, $Al_2(SO_4)_3$ was not required. In addition, as the pure fibrous sludge could be collected, the effective recycling of sludges would be done.

Keywords

decolorization;collecting yield;calcium hypochlorite;triethanolamine;Triton X-100;fibrous sludge;turbidity

Acknowledgement

Supported by : 산업자원부

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