Addition of HCl as a means to improve biogas production from protein-rich food industry waste
2012 (English)In: Biochemical engineering journal, ISSN 1369-703X, Vol. 61, 43-48 p.Article in journal (Refereed) Published
The effect of pH on the production of biogas during anaerobic digestion of a protein-rich substrate, containing mainly slaughter house waste, was investigated. Four laboratory scale reactors (4 L liquid volume) with an organic load of 3.5 g volatile solids (VS) L-1 reactor volume day(-1), and a hydraulic retention time 24 days were run under mesophilic conditions in semi-continuous mode for 64 days. Two of the reactors were pH-regulated (target pH was 7.6 and 7.8, respectively) by adding HCl, while the other two reactors were operated as controls (pH 8.0). By the end of the experiment the pH-controlled reactors produced 0.6 L of methane g VSadded-1 day(-1), while the controls produced 0.4 L. The gas produced did in all cases have a CH4 - content of about 65%. The improvement in process performance in the pH-regulated reactors, compared to the controls, was also reflected in lower final levels of acetate, propionate, isobutyrate and 2-metylbutyrate. The laboratory-scale study showed that lowering the pH by 0.2-0.4 units by adding HCl to the reactors increased the methane yield with about 50%, indicating a considerable increase of the microbial ability to utilise the organic material for biogas production.
Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 61, 43-48 p.
Anaerobic digestion, Slaughter house waste, pH-control, Ammonia, Volatile fatty acids, Process improvement
IdentifiersURN: urn:nbn:se:liu:diva-76536DOI: 10.1016/j.bej.2011.12.003ISI: 000301206600006OAI: oai:DiVA.org:liu-76536DiVA: diva2:515129