Results of a continuous wastewater experiment conducted in an upflow anaerobic sludge blanket (UASB) reactor at 37°C showed that m- and o-cresols (225 mg·1−1 each) could be partially degraded, and their presence did not adversely affect methanogenesis of benzoate (1000 mg·1−1) and sulfidogenesis of sulfate (1800-5600 mg·1−1). With 12 hours of hydraulic retention, the reactor on average was able to remove over 99.5% of benzoate, 11.0% of m- cresol, 8.3% of o-cresol and reduce up to 48% of sulfate. Sulfate was reduced at a constant rate of 1630 mg·(1·d)−1, independent of sulfate concentration. Results of batch tests showed that biogranules were able to remove 46.2% of m-cresol and 37.4% of o-cresol in 100 hours. Furthermore, biogranules treating solutions containing 1250 mg·1−1 of sulfate degraded benzoate at an average rate 125% faster than those treating sulfate-free solutions; 74.4% of the electron flow was used for methanogenesis and only 25.6% for sulfidogenesis. Results suggest that most sulfidogens in the biogranule were acetogenic, producing acetate, most of which was subsequently converted by methanogens into methane.
Research Article|September 01 1997
Anaerobic degradation of benzoate and cresol isomers in sulfate-rich wastewater
Herbert H. P. Fang
*Environmental Research Centre, Department of Civil and Structural Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
**National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai, China
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Water Sci Technol (1997) 36 (6-7): 7-14.
Herbert H. P. Fang, Gong-Ming Zhou; Anaerobic degradation of benzoate and cresol isomers in sulfate-rich wastewater. Water Sci Technol 1 September 1997; 36 (6-7): 7–14. doi: https://doi.org/10.2166/wst.1997.0569
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