Title: Effect of chemical oxygen demand (COD) on hydrogen production from waste molasses in continuous stirred tank reactor (CSTR)
Abstract: The performance of anaerobic hydrogenation was evaluated in a continuous stirred-tank reactor (CSTR) operated at different influent chemical oxygen demand (COD) concentration with selectively enriched anaerobic mixed consortia in this present study. Waste molasses was used as a model substrate. The CSTR was started at a hydraulic retention time (HRT) of 8 hours with a temperature of (35±1)°C. Four OLRs were examined, ranging from 6.0 to 24.0 kg/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ·d, with influent glucose concentrations ranging from 2000 to 8000 mgCOD/L. The highest H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> production (10.96 L/d) was obtained at 18 kg/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ·d of OLR. When influent COD concentration rose to 8000 mg/L, The pH and ALK dropped to 3.7 and 5 mg/L from the level of 4 and 250 mg/L. and Oxidation-Reduction Potential (ORP) rose to -210 mV from -350 mV. The biomass concentration in the CSTR system could not endure these changes, and its activity was restrained. The H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> yield had quick descent. The changed influent COD concentration would have direct impact on the activity of hydrogen producing bacteria and metabolic characteristics of microbial community in the fermentative process.
Publication Year: 2010
Publication Date: 2010-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 4
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