Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7079234 | Bioresource Technology | 2013 | 7 Pages |
Abstract
This work studied the anaerobic conversion of neutralized volatile fatty acids (VFA) into biogas under Autogenerative High Pressure Digestion (AHPD) conditions. The effects of the operating conditions on the biogas quality, and the substrate utilisation rates were evaluated using 3 AHPD reactors (0.6Â L); feeding a concentration of acetate and VFA (1-10Â g COD/L) corresponding to an expected pressure increase of 1-20Â bar. The biogas composition improved with pressure up to 4.5Â bar (>93% CH4), and stabilized at 10 and 20Â bar. Both, acetotrophic and hydrogenotrophic methanogenic activity was observed. Substrate utilisation rates of 0.2, 0.1 and 0.1Â g CODCH4/g VSS/d for acetate, propionate and butyrate were found to decrease by up to 50% with increasing final pressure. Most likely increased Na+-requirement to achieve CO2 sequestration at higher pressure rather than end-product inhibition was responsible.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Ralph E.F. Lindeboom, Ivet Ferrer, Jan Weijma, Jules B. van Lier,