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), Journal Name: Environ. Sci. Technol.; (United States) Vol. 22:12; ISSN ESTHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Terrestrial-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANAEROBIC CONDITIONS
AROMATICS
BIODEGRADATION
CHEMICAL REACTIONS
CHLORINATED AROMATIC HYDROCARBONS
CLEANING
DECHLORINATION
DECOMPOSITION
DECONTAMINATION
DEHALOGENATION
HALOGENATED AROMATIC HYDROCARBONS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOILS
WASTES