Enhancement of pentachlorophenol degradation in soil through induced anaerobiosis and bioaugmentation with anaerobic sewage sludge
The addition of biologically active anaerobic sewage sludge, previously shown to dechlorinate chlorophenols, to soil contaminated with pentachlorophenol (PCP) resulted in greatly enhanced rates of PCP degradation. The sludge was added to a soil at a rate of 5 g kg/sup -1/ (dry weight basis) and the mixture incubated anaerobically. Initial PCP concentrations of 10-30 mg kg/sup -1/ (ppm) were completely degraded within 28-35 days. In anaerobic soil without sludge or aerobic soil with or without sludge, PCP persisted, 55% and 90%, respectively, remaining after 56 days. Higher rates of sludge addition gave small differences in PCP degradation. PCP was degraded by sequential dechlorination, and the products of PCP degradation in soil-sludge mixtures were the same as observed in sludge alone. The sequence of products was PCP ..-->.. 2,3,4,5-tetrachlorophenol ..-->.. 3,4,5-trichlorophenol ..-->.. 3,5-dichlorophenol ..-->.. 3-chlorophenol; 3,4-dichlorophenol was also observed. These results clearly demonstrate that the dechlorinating activity present in sludge could be transferred to soil through bioaugmentation.
- Research Organization:
- Michigan State Univ., East Lansing (USA)
- OSTI ID:
- 5992345
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 22:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CHLORINATED AROMATIC HYDROCARBONS
BIODEGRADATION
SOILS
DECONTAMINATION
ANAEROBIC CONDITIONS
DECHLORINATION
SEWAGE SLUDGE
AROMATICS
CHEMICAL REACTIONS
CLEANING
DECOMPOSITION
DEHALOGENATION
HALOGENATED AROMATIC HYDROCARBONS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEWAGE
SLUDGES
WASTES
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
560300 - Chemicals Metabolism & Toxicology