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Improvement of biogas production from vinasse via covalently immobilized methanogens
I G Lalov1, M A Krysteva, J L Phelouzat
1University of Chemical Technology and Metallurgy, Department of Biotechnology, Sofia, Bulgaria.
Bioresource Technology
|June 9, 2001
Abstract:
Improvement of biogas production was realized by covalent immobilization of a methanogenic consortium onto a granulated polymeric support [poly(acrylonitrile-acrylamide)]. The growth kinetics of the immobilized consortium was investigated during a process of vinasse methanation, and a cell concentration increase from 12.3 mg g(-1) support to 52.1 mg g(-1) support was established. The methane yield reached 0.33 m3 kg(-1) CODr, the maximum yield on chemical oxygen demand (COD) removal being 92%. The inhibitory effect of oxygen was reduced by immobilizing the methanogenic consortium.