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Objective & Scope
1. Screening of microorganisms degrading cyanide compounds 2. Characterization of biological removal mechanism of cyanide compounds 3. Development of biological treatment process for cyanide compounds Main Contents Large amounts of cyanides are released in solid wastes and wastewaters of different industrial activities related to metal plating, alumium electrolysis, coal gasification, coal coking, and the production of pharmaceuticals. Since cyanide is highly toxic to ecosystems, cyanide-containing effluents cannot be discharged without being subjected to treatment to reduce to very low levels (< 0.1 ppm of CN-). To prevent the access of cyanide to ecosystems, many biological detoxifications of cyanide have been tried, since the biological system has been considered to be the most effective and ultimate method. Many microorganisms have an inherent capacity to degrade the toxic organic compounds that enter the environment as a result of pollution and natural activities. However, there are few examples of biological degradation for cyanide compounds in the field. In this study, the characteristics and metabolism of newly isolated microorganism degrading cyanide compounds and biological cyanide removal process was studied. A yeast strain of Cryptococcus humicolus was isolated from a coke-oven-gas wastewater. The cyanide metabolism of this strain was investigated through 13C-NMR analysis. Also a fungal strain of Acremonium strictum capable of degrading thiocyanate was isolated. Biological treatment of cyanide containing wastewater was investigated by using RBC (rotating biological contactor) and honey-comb typed biofilm reactors. Related Projects Title : Studies about the biological treatment of COG wastewater Period : 19950101-19951231 Support : POSCO References 1) Treatment of cyanide compounds in COG condensate using Rotationg Biological Contactors Hyouk Kee Kwon, Thesis of Master(1997), POSTECH, KOREA 2) Biological treatment and degradation metabolism of cyanide compounds by microorganisms isolated from wastewater of coke oven plant Hyouk Kee Kwon, Thesis of Doctor(2002), POSTECH, KOREA 3) Sequential degradation of phenol and cyanide by a commensal interaction between two microorganisms M.H. Kang and J.M. Park, J. Chem. Tech. Biotech., 69(2), 226 (1997) 4) Thiocyanate degradation by Acremonium strictum and inhibition by secondary toxicants H.K. Kwon, S.H. Woo, and J.M. Park, Biotechnol. Lett., 24(16), 1347 (2002) 5) Degradation of tetracyanonickelate (II) by Cryptococcus humicolus MCN2 H.K. Kwon, S.H. Woo, and J.M. Park, FEMS Microbiol. Lett., 214(2), 211 (2002) Related Patents 1) Isolation of cyanide- and thiocyanide-degrading bacteria and development of wastewater treatment methods by using these bacteria J.M. Park and E.D. Park, Korea Patent (1998) |
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