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Addition of HCl as a means to improve biogas production from protein-rich food industry waste

Paper ID Volume ID Publish Year Pages File Format Full-Text
3581 176 2012 6 PDF Available
Title
Addition of HCl as a means to improve biogas production from protein-rich food industry waste
Abstract

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.

► The pH of anaerobic digestion process was reduced from 8.0 to 7.8. ► A ∼50% increase in methane yield was achieved. ► Levels of acetate, propionate and iso-butyrate were reduced. ► The positive effects are likely related to decreased concentration of NH3.

Keywords
Anaerobic digestion; Slaughter house waste; pH-control; Ammonia; Volatile fatty acids; Process improvement
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Addition of HCl as a means to improve biogas production from protein-rich food industry waste
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 61, 15 February 2012, Pages 43–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us