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Addition of HCl as a means to improve biogas production from protein-rich food industry waste
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
Linköping University, The Tema Institute. Linköping University, Faculty of Arts and Sciences.
2012 (English)In: Biochemical engineering journal, ISSN 1369-703X, Vol. 61, 43-48 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Anaerobic digestion, Slaughter house waste, pH-control, Ammonia, Volatile fatty acids, Process improvement
National Category
Social Sciences
URN: urn:nbn:se:liu:diva-76536DOI: 10.1016/j.bej.2011.12.003ISI: 000301206600006OAI: diva2:515129
Available from: 2012-04-12 Created: 2012-04-11 Last updated: 2012-04-12

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Karlsson, AnnaEjlertsson, Jörgen
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Department of Water and Environmental StudiesFaculty of Arts and SciencesThe Tema Institute
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