Kinetic analysis of the anaerobic digestion of untreated vinasses and vinasses previously treated with Penicillium decumbens
Jiménez, A.M., Borja, R., Martin santos, M.D.L.A. and Raposo, F. (2006) Kinetic analysis of the anaerobic digestion of untreated vinasses and vinasses previously treated with Penicillium decumbens. Journal of Environmental Management, 80, (4), 303-310. (doi:10.1016/j.jenvman.2005.09.011).
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A kinetic study was carried out on the anaerobic digestion of untreated vinasses and vinasses previously fermented with Penicillium decumbens. Two 1-l volume continuous-flow stirred tank reactors (CFSTR) operating at mesophilic temperature (35 °C) were used for the study. One reactor was fed with untreated vinasses (COD concentration of 80.5 g/l) and the other with vinasses previously fermented (COD concentration of 23.0 g/l). Both reactors were operated at organic loading rates in the range of 1.5–7.5 g chemical oxygen demand (COD)/l-d. The results obtained were evaluated using the Chen–Hashimoto methane production model to determine the values of the maximum specific growth rate (μmax) and the model kinetic constant (K) of the process for each case studied. The kinetic constants (μmax and K) were affected by the pre-treatment, and the respective values were 9.6 and 6.9 times higher for pretreated vinasses than those of untreated vinasses. This was significant at the 95% confidence level. This behaviour is believed to be due to the lower levels of phenolic compounds present in the pretreated vinasses, as compared to untreated vinasses, resulting in an improved process performance, kinetics and stability. Finally, the experimental values of methane production were reproduced with deviations equal to or less than 4% and 10% for pretreated and untreated vinasses, respectively.
|Keywords:||anaerobic digestion, kinetics, vinasses, penicillium decumbens|
|Subjects:||G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TD Environmental technology. Sanitary engineering
|Divisions:||University Structure - Pre August 2011 > School of Civil Engineering and the Environment
|Date Deposited:||22 Jul 2008|
|Last Modified:||02 Mar 2012 12:50|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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