Journal
ADVANCED SCIENCE LETTERS
Volume 22, Issue 2, Pages 519-523Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/asl.2016.6843
Keywords
4-Chlorophenol; Arthrobacter chlorophenolicus A6; Packed Bed Reactor; Biomass Immobilization; Toxicity; Pollutant Loading Rate; 4-Chlorocatechol
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Chlorinated phenols are listed under priority pollutants and their concentration in industrial effluent even reached to 1000 mg l(-1). However, investigation on biodegradation of chlorophenol at such high concentration is found to be scanty. The present study investigated biodegradation of 4-chlorophenol (4-CP) by Arthrobacter chlorophenolicus A6 in a upflow packed bed reactor (PBR) by varying its influent concentration from 400 mg l(-1) to 1000 mg l(-1), and hydraulic retention time (HRT) between 24 h and 7.5 h. Almost complete removal of the pollutant and 97.85% effluent toxicity removal were achieved in the PBR at a pollutant loading rate of 1707 mg l(-1) day(-1) or lesser. However, at higher pollutant loading rates, the reactor performance deteriorated due to temporary accumulation of toxic intermediates such as 4-chlorocatechol. Furthermore, response of the PBR under shock loading condition was tested and the PBR system found to have good compatibility in handling shock loadings.
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