Anaerobic degradation of pentachlorophenol (PCP) in biological expanded-bed reactor

In this study, anaerobic degradation of PCP was discussed in an expanded-bed GAC anaerobic reactor which was applied to treatment of wastewater containing high concentration of PCP-Na as well as acetate. Total-COD concentration in effluent was kept less than 100 mg/L except for the start-up duration...

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Bibliographic Details
Published in:Water science and technology 1996, Vol.34 (5-6), p.335-344
Main Authors: Tsuno, Hiroshi, Kawamura, Masasumi, Somiya, Isao
Format: Article
Language:English
Subjects:
Acetates
Acetic acid
activated carbon
Anaerobic treatment
Biodegradation
biological inhibition
Carbon dioxide
chlorinated organics
Dechlorination
Degradation
Duration
Effluents
expanded-bed reactor
Influents
Material balance
Methane
Microorganisms
Pentachlorophenol
Phenols
Reactors
Wastewater
Wastewater treatment
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Summary:In this study, anaerobic degradation of PCP was discussed in an expanded-bed GAC anaerobic reactor which was applied to treatment of wastewater containing high concentration of PCP-Na as well as acetate. Total-COD concentration in effluent was kept less than 100 mg/L except for the start-up duration and PCP-Na concentration was kept less than 0.50 mg/L under the experimental conditions (HRT of 5 days, influent PCP-Na concentration of 100 and 400 mg/L, and influent Total-COD concentration of 480 and 1600 mg/L). It was indicated by methane production rate and material balance of PCP-Na that about 60% of PCP-Na loaded into the reactor was transformed to methane and C02 for 375 days. GC/MS analysis of extracts of the GAC medium and effluent indicated that reductive dechlorination of PCP occurred and dechlorinated phenols were adsorbed on the GAC in the reactor. Microorganisms collected from the reactor degraded PCP-Na and 2-CP anaerobically and addition of acetate in culture accelerated anaerobic degradation of PCP-Na in batch experiments.
ISSN:0273-1223
1996-9732
DOI:10.1016/0273-1223(96)00663-4