Biosorption and biodegradation of pentachlorophenol (PCP) in an upflow anaerobic sludge blanket (UASB) reactor

In order to understand the fate of PCP in upflow anaerobic sludge blanket reactor (UASB) more completely, the sorption and biodegradation of pentachlorophenol (PCP) by anaerobic sludge granules were investigated. The anaerobic granular sludge degrading PCP was formed in UASB reactor, which was seede...

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Bibliographic Details
Published in:Biodegradation (Dordrecht) 2007-10, Vol.18 (5), p.617-624
Main Authors: Ye, Fen-Xia, Li, Ying
Format: Article
Language:English
Subjects:
Adsorption
Ananerobic granular sludge
Biodegradation
Biodegradation of pollutants
Biodegradation, Environmental
Biological and medical sciences
Bioreactors
Biosorption
Biotechnology
Chlorophenol
desorption
Environment and pollution
Environmental Restoration and Remediation - methods
Equipment Design
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
Kinetics
Load distribution
Models, Chemical
Pentachlorophenol
Pentachlorophenol - chemistry
Reactors
Retention time
Sewage
Sludge
Sorption
Time Factors
upflow anaerobic sludge blanket reactor
Waste Disposal, Fluid
Waste Management - methods
Water - chemistry
Water Purification
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Summary:In order to understand the fate of PCP in upflow anaerobic sludge blanket reactor (UASB) more completely, the sorption and biodegradation of pentachlorophenol (PCP) by anaerobic sludge granules were investigated. The anaerobic granular sludge degrading PCP was formed in UASB reactor, which was seeded with anaerobic sludge acclimated by chlorophenols. At the hydraulic retention time (HRT) of 20-22 h, and PCP loading rate of 200-220 mg l-¹ d-¹, UASB reactor exhibited good performance in treating wastewater which containing 170-180 mg l-¹ PCP and the PCP removal rate of 99.5% was achieved. Sequential appearance of tetra-, tri-, di-, and mono-chlorophenol was observed in the reactor effluent after 20 mg l-¹ PCP introduction. Sorption and desorption of PCP on the anaerobic sludge granules were all fitted to the Freundlich isotherm equation. Sorption of PCP was partly irreversible. The Freundlich equation could describe the behavior of PCP amount sorbed by granular sludge in anaerobic reactor reasonably well. The results demonstrated that the main mechanism leading to removal of PCP on anaerobic granular sludge was biodegradation, not sorption or volatization.
ISSN:0923-9820
1572-9729
DOI:10.1007/s10532-006-9094-2