Anaerobic biological treatment of phenolic wastewater at 15-18 degrees C |
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Authors: | Collins Gavin Foy Clare McHugh Sharon Mahony Thérèse O'Flaherty Vincent |
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Affiliation: | Microbial Ecology Laboratory, Department of Microbiology and Environmental Change Institute, National University of Ireland, Galway, University Road, Galway, Ireland. |
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Abstract: | Low-temperature, or psychrophilic (<20 degrees C) anaerobic digestion has been proven feasible for the mineralisation of simple wastewaters. In this study, hybrid expanded granular sludge bed-anaerobic filter (EGSB-AF) bioreactors were used to evaluate the feasibility of psychrophilic digestion for the treatment of phenol-containing wastewater. Efficient chemical oxygen demand and phenol removal were observed at organic and phenol loading rates of 5 kg COD m(-3)d(-1) and 0.4-1.2 kg phenol m(-3)d(-1) (400-1200 mg phenol [l wastewater](-1)), respectively. There was no long-term accumulation of volatile fatty acids in the reactor systems. Methanogenic activity was developed under psychrophilic conditions but anaerobic methane-producing populations remained mesophilic throughout the trial of 415 days. |
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Keywords: | Psychrophilic anaerobic digestion Phenol EGSB Specific methanogenic activity. |
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