期刊
BIORESOURCE TECHNOLOGY
卷 100, 期 20, 页码 4572-4578出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.04.044
关键词
4-Chlorophenol; Cometabolism; Ecotoxicity; Sequencing batch reactor; Temperature
资金
- Spanish MCI [CTM2004-00337, CTM2007-60959]
The simultaneous removal of 4-chlorophenol (4-CP) and phenol in lab-scale sequencing batch reactors at different temperatures has been studied. Phenol feed concentration was fixed at 525 mg/L and 4-CP concentration was increased from 105 to 2100 mg/L at a constant hydraulic residence time (HRT) of 10.5 d. Complete phenol and 4-CP biodegradation was achieved during the aerobic stage working with 4-CP concentrations up to 1470 mg/L in the feed. Both 4-CP and phenol specific initial removal rates were strongly affected by 4-CP feed concentration and temperature. Only at the highest temperature tested (35 degrees C) it was possible to increase the maximum assimilative 4-CP concentration by the biological Sludge up to 2100 mg/L, and a significant reduction of the ecotoxicity of the effluents was observed. 4-chlorocatechol (4-CC) was identified as the major intermediate in the aerobic cometabolic 4-CP degradation, being the ecotoxicity of that species substantially lower than that of 4-CP. (C) 2009 Elsevier Ltd. All rights reserved.
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