Recovery of biohydrogen in a single-chamber microbial electrohydrogenesis cell using liquid fraction of pressed municipal solid waste (LPW) as substrate

Zhen, Guangyin and Takuro, Kobayashi and Lu, Xueqin and Kumar, Gopalakrishnan and Bakonyi, Péter and Rózsenberszki, Tamás and Koók, László and Nemestóthy, Nándor and Bélafi-Bakó, Katalin and Xu, Kaiqin (2016) Recovery of biohydrogen in a single-chamber microbial electrohydrogenesis cell using liquid fraction of pressed municipal solid waste (LPW) as substrate. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, 41. pp. 17896-17906. ISSN 0360-3199 (Unpublished)

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Abstract

The use of liquid fraction of pressed municipal solid waste (LPW) for hydrogen production was evaluated via electrohydrogenesis in a single-chamber microbial electrolysis cell (MEC). The highest hydrogen production (0.38 ± 0.09 m3 m–3 d–1 and 30.94 ± 7.03 mmol g–1 CODadded) was achieved at an applied voltage of 3.0 V and pH 5.5, increasing by 2.17-fold than those done at the same voltage without pH adjustment (pH 7.0). Electrohydrogenesis was accomplished by anodic oxidation of fermentative end-products (i.e. acetate, as well as propionate and butyrate after their acetification), with overall hydrogen recovery of 49.5 ± 11.3% of CODadded. These results affirm for the first time that electrohydrogenesis can be a noteworthy alternative for hydrogen recovery from LPW and simultaneous organics removal. Electrohydrogenesis efficiency of this system has potential to improve provided that electron recycling, electromethanogenesis and deposition of non-conductive aggregates on cathode surface, etc. are effectively controlled.

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