Enhancement of biodegradability of polychlorinated dibenzo-p-dioxins.
Enhancement of biodegradability of polychlorinated dibenzo-p-dioxins (PCDDs) was studied with new isolated bacterial strains from soil and oxic-sediments contaminated by PCDDs. The results indicated that mono- and di-chlorinated dibenzo-p-dioxins could be utilized as a sole carbon source and degraded by isolated bacterial strains, but tri-chlorinated dibenzo-p-dioxin (TrCDD) was hardly degraded. The biodegradability of TrCDD and tetra-chlorinated dibenzo-p-dioxin (TCDD) by the strain Pseudomonas sp. EE41, a new isolated one, could be enhanced through primary nutrient of co-metabolism of o-dichlorobenzene (o-DCB). In this case, TrCDD (1.2mg/l for 3 weeks) was degraded by 33.1% and the degradation rate enhanced more than 2 fold; also TCDD (0.1 mg/l for 3 weeks) biodegraded by 37.8%. Most highly chlorinated, Penta-, Hexa-, Hepta-, and Octa-chlorinated, dibenzo-p-dioxins (P-CDD, H6, H7-CDD and OCDD) tested in this study could not be degraded while accumulated in bacterial cells.
Du
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Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing. zhunk@mail.rcees.ac.cn
Zhu
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Xia
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Bao
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Xu
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D001673:Biodegradation, Environmental; D002681:China; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000737:chemistry*; D011549:Pseudomonas / Q000302:isolation & purification / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants
D000072317:Polychlorinated Dibenzodioxins; D012989:Soil Pollutants