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Construction of hydrogen fermentation from garbage slurry using the membrane free bioelectrochemical system

Paper ID Volume ID Publish Year Pages File Format Full-Text
20685 43186 2012 6 PDF Available
Title
Construction of hydrogen fermentation from garbage slurry using the membrane free bioelectrochemical system
Abstract

The aim of this study was to show the effectiveness of the membrane free bioelectrochemical system (BES) using three electrodes on inhibition of methanogenesis and construction of hydrogen fermentation from the artificial garbage slurry. The electrical redox-potential on the working electrode was adjusted to − 1.0 V (vs. Ag/AgCl) that has positive effect on methanogenesis. The redox-potential on the counter electrode was measured to be 1.6 V. The pH in the effluents was 5.5–6.4. Hydrogen production rate at the cathode side was similar to that at the anode side and much higher than that calculated from current, and reached a maximum of 2445 ± 815 (average ± standard deviation) mL L− 1 d− 1 at an organic loading rate of 58.7 g dichromate chemical oxygen demand per L d− 1. Methane production was negligible throughout the experiment. Acetate and butyrate were the main products of the fermentation using a BES; these offered favorable conditions for hydrogen production. The bacterial community in the bioelectrochemical hydrogen fermentor differed from that in the methanogenic seed sludge and included hitherto unknown species. These results show that high redox-potential on the anodic electrode and acidic pH in the membrane free BES can be utilized for hydrogen fermentation from the artificial garbage slurry by avoiding methanogenesis.

Keywords
Bioelectrochemical system; Cathodic and anodic reactions; Hydrogen; Bacterial community; Garbage
First Page Preview
Construction of hydrogen fermentation from garbage slurry using the membrane free bioelectrochemical system
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 114, Issue 1, July 2012, Pages 64–69
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering