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Nitrogen and Phosphorus Removal from Plating Wastewater Using the Soil Reactor

토양 반응조를 이용한 도금폐수 중의 질소 및 인 제거

  • Cheong, Kyung-Hoon (Department of Environmental Engineering and BK21 Team for Biohydrogen Production, Chosun University) ;
  • Choi, Hyung-Il (Department of Environmental Engineering, Chosun University) ;
  • Shin, Dae-Yun (Department of Environmental Engineering, Chosun University) ;
  • Im, Byung-Gab (Department of Environmental Engineering, Chosun University) ;
  • Jeon, Gee-Seok (Environmental Management Corporation)
  • 정경훈 (조선대학교 환경공학과 BK21 바이오 가스기반 수소생산 사업팀) ;
  • 최형일 (조선대학교 환경공학과) ;
  • 신대윤 (조선대학교 환경공학과) ;
  • 임병갑 (조선대학교 환경공학과) ;
  • 전기석 (환경관리공단)
  • Published : 2009.02.28

Abstract

A laboratory experiment was conducted to investigate nitrogen removal from plating wastewater by a soil reactor. A combination of soil, waste oyster shell and activated sludge were used as a loading media in a soil reactor. The addition of 20% waste oyster shell and activated sludge to the soil accelerated nitrification (88.6% ${NH_4}^{+}-N$ removal efficiency) and denitrification (84.3% ${NO_3}^{-}-N$ removal) in the soil reactor, respectively. In continuous removal, the influent ${NH_4}^{+}-N$ was mostly converted to nitrate nitrogen in the nitrification soil reactor and only a small amount of ${NH_4}^{+}-N$ was found in the effluent. When methanol was added as a carbon source to the denitrification soil reactor, the average removal efficiency of ${NO_3}^{-}-N$ significantly increased. The ${NO_3}^{-}-N$ removal by methanol addition in the denitrification soil reactor was mainly due to denitrification. The phosphorus was removed by the waste oyster shell media in the nitrification soil reactor. Moreover, the phosphorus removal in the denitrification soil reactor was achieved by synthesis of bacteria and the denitrification under anaerobic conditions. The approximate number of nitrifiers and denitrifiers was $3.3{\times}10^5\;MPN/g$ soil at a depth of $1{\sim}10\;cm$ and $3.3{\times}10^6\;MPN/g$ soil at a depth of $10{\sim}20\;cm$, respectively, in the soil reactor mixed with a waste oyster shell media and activated sludge.

Keywords

Soil reactor;Plating wastewater;Nitrification;Denitrification

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