Degradation of Cyanide by Activated Sludge Immobilized with Polyethylene Glycol

고정화 활성슬러지를 이용한 시안 분해

  • Cheong, Kyung-Hoon (Department of Environmental Engineering and BK21 Team for Biohydrogen Production, Chosun University) ;
  • Choi, Hyung-Il (Department of Environmental Engineering, Chosun University) ;
  • Kim, Jung-Ae (Department of Environmental Engineering, Chosun University) ;
  • Moon, Ok-Ran (Department of Environmental Engineering, Chosun University) ;
  • Kim, Myung-Hee (Department of Chemistry, Chonnam University)
  • 정경훈 (조선대학교 환경공학과 BK21 바이오 가스기반 수소생산 사업팀) ;
  • 최형일 (조선대학교 환경공학과) ;
  • 김정애 (조선대학교 환경공학과) ;
  • 문옥란 (조선대학교 환경공학과) ;
  • 김명희 (전남대학교 화학과)
  • Published : 2008.12.31


The activated sludge obtained from wastewater coke oven plant was immobilized by entrapment with polyethylene glycol (PEG). The effects of several factors on the biodegradation of $CN^-$ from. synthetic wastewater were investigated using batch and continuous reactors. The degradation rate of $CN^-$ increased with increasing of the immobilized bead volume in the reactor. Approximately 7.65mg/L of $NH_4-N$ was produced upon the degradation of 35mg/L of $CN^-$. When high concentrations of the toxic cyanide complex were used in the testing of cyanide degradation, the free activated sludge could be inhibited more than that of the immobilized activated sludge. When the phenol concentration was higher than 400mg/L in the synthetic wastewater, approximately 98.4% of $CN^-$ was removed within 42 hours by the immobilized activated sludge. However, the cyanide was not completely degraded by the tree activated sludge. This indicates that high phenol concentrations can act as a toxic factor for the free activated sludge. A $CN^-$ concentration of less than 1mg/L was achieved by the immobilized sludge at the loading rate of 0.025kg $CN^-/m^3-d$. Moreover, it was found that the HRT should be kept for 48 hours in order to obtain stable treatment conditions.


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