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Environmental Engineering Research 2000;5(3): 165-173.
INFLUENCE OF ENVIRONMENTAL PARAMETERS ON BIOREMEDIATION OF CHLOROPHENOL-CONTAMINATED SOIL BY INDIGENOUS MICROORGANISMS
Young-Gyun Cho1, Sung-Keun Rhee2, and Sung-Taik Lee1
1Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea
2Present address : Environmental Bioresources Lab., Korea Research Institute of Bioscience and Biotechnology, Taejon 305-600, Korea
Corresponding Author: Sung-Taik Lee ,
Received: July 11, 2000;  Accepted: September 10, 2000.
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ABSTRACT
A study was conducted to establish the optimal conditions for in situ bioremediation of chlorophenol-contaminated soil by indigenous microorganisms. Three chlorophenols, 4-chlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol, were chosen as model contaminants; two previously uncontaminated soils (soils N and R) were selected as soil sources for contamination. When soils N and R were artificially contaminated with chlorophenols (30 mg/kg each), more than 90% of 4-chlorophenol and 2,4,6-trichlorophenol were degraded within 60 days in both semi-pilot scale microcosms. Pentachlorophenol was completely degraded within 160 days only in the soil R microcosm. In the experimental conditions, any accumulation of non-degradable metabolic intermediates was not observed. The optimal pH and temperature for degradation were pH 7.0 and 30 T respectively. Supplemental carbon and nitrogen sources had no significant effect on the biodegradation of chlorophenols. Among environmental factors, oxygen significantly influenced the efficiency of in situ bioremediation of chlorophenol-contaminated soil.
Keywords: bioremediation | chlorophenol | environmental parameters | indigenous microorganisms | soil microcosm
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