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Biological degradation of chlorophenols in packed-bed bioreactors using mixed bacterial consortia

Paper ID Volume ID Publish Year Pages File Format Full-Text
36078 45120 2006 7 PDF Available
Title
Biological degradation of chlorophenols in packed-bed bioreactors using mixed bacterial consortia
Abstract

Two packed-bed bioreactors filled with carriers of foamed glass beads were tested at 14 °C (bioreactor RA) or at 23 ± 1 °C (bioreactor RB) for the continuous treatment of a mixture of 2-chlorophenol (2CP), 4-chlorophenol (4CP), 2,4-dichlorophenol (DCP) and 2,4,6-trichlorophenol (TCP). The reactors were inoculated by mixed bacterial consortia acclimatized to the pollutants at each temperature during 4 months and continuously fed with a mixture of 2CP, 4CP, DCP and TCP at equal concentrations (25–37.5 mg l−1) at various hydraulic retention times (HRT). The best removal efficiencies were achieved at a total pollutant loading rate (PLR) of 11 mg l−1 h−1 (8.7 h HRT for a total inlet chlorophenols concentration of 100 mg l−1) when all pollutants were degraded by more than 99% in both reactors and their concentrations in the effluents were below the detection limit (0.1 mg l−1). The highest chlorophenol removal rates (48.3 and 60.6 mg l−1 h−1 in RA and RB bioreactors, respectively), were achieved at a PLR of 81 mg l−1 h−1 (1.86 h HRT and at total chlorophenol inlet concentration of 150 mg l−1). Under all conditions, chloride was released to 84 ± 9% of the theoretical value calculated from the amount of degraded chlorophenols. The dissolved oxygen concentration in the liquid correlated well with the removal of contaminants.

Keywords
Biofilm; Chlorophenols; Biodegradation; Low temperature; Groundwater
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Biological degradation of chlorophenols in packed-bed bioreactors using mixed bacterial consortia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 41, Issue 5, May 2006, Pages 1083–1089
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us