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The biodegradation and COD removal of 2-chlorophenol in a granular anoxic baffled reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
23196 43419 2014 7 PDF Available
Title
The biodegradation and COD removal of 2-chlorophenol in a granular anoxic baffled reactor
Abstract

•This work presents an AnBR for biodegradation of halogenated aromatics.•The AnBR was very efficient in biodegrading and dehalogenating 2-chlorophenol.•The AnBR biodegraded 2-chlorophenol to a much greater extent than does ABR.•A large and dense granule was developed in the AnBR under anoxic condition.•AnBR is a viable option for biodegradation of halogenated organics.

The present work was designed to developed a granular anoxic baffled reactor (AnBR) and to investigate its performance in the treatment of 2-chlorophenol (2-CP). The acclimation and enrichment of microorganisms in activated sludge to degrade 2-CP was effectively accomplished. Then the influence of inlet 2-CP, hydraulic retention time (HRT), salinity, and type of electron acceptor (nitrate or organic compound) on the performance of AnBR in biodegradation of 2-CP was investigated. The increase of inlet 2-CP from 50 to 500 mg/L at a fixed HRT of 24 h did not adversely affected the AnBR where over 99% of inlet 2-CP was biodegraded. Decreasing the HRT stepwise from 24 to 4 h at an inlet 2-CP of 200 mg/L did not inhibit the rate of biodegradation (>99%). The increase of over 20 g/L salinity in the feed stream strongly inhibited the rate of 2-CP biodegradation in the AnBR, whereas the bioreactor could efficiently tolerate concentrations below 20 g/L NaCl. Moreover, the rate of 2-CP biodegradation under anoxic denitrifying metabolic conditions (presence of nitrate) was much greater than that under anaerobic metabolic conditions (absence of nitrate). Accordingly, the AnBR process is a feasible, simple, low-cost, and thus appropriate process for efficiently biodegrading toxic chlorinated organic compounds.

Keywords
Chlorophenols; Biodegradation; Anoxic metabolism; Baffled reactor; Granular biomass
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The biodegradation and COD removal of 2-chlorophenol in a granular anoxic baffled reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 184, 20 August 2014, Pages 111–117
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