Bio-hydrogen production from food waste and sewage sludge in the presence of aged refuse excavated from refuse landfill

Ming Li, Youcai Zhao, Qiang Guo, Xiaoqing Qian and Dongjie Niu

Renewable Energy, 2008, vol. 33, issue 12, 2573-2579

Abstract: In this work, the aged refuse (AR) excavated from a typical refuse landfill with over 10 years of placement was used for the enhancement of bio-hydrogen production from food wastes. Firstly, the food wastes taken from a university dining hall were inoculated with sewage sludge (SL) pre-treated by 15min heating at 80°C. It was found that below 0.4% of hydrogen concentration could be detected in the biogas produced due to its severe acidification properties. However, the addition of AR (50% in weight) can considerably increase the hydrogen concentration in the biogas to over 26.6% with pH ascending from 4.36 to 5.81, in comparison with 4–6% using activated carbon as additive with pH descending from 4.43 to 3.91. Meanwhile, it was also found that the hydrogen content in the biogas decreased drastically to 3.3% when the AR was sterilized by heating at 160°C for 2h and then used as additive for bio-hydrogen production from food wastes, indicating that the AR may chiefly function as a microbial inoculum instead of a porous material like activated carbon. Statistical analysis showed that the ultimate hydrogen production potential (Hp), hydrogen production rate (Rmax) and lag-phase time (λ) were found to be 193.85mL/gVS, 94.35mL/(hgVS), 15.28h, respectively, in the presence of 50% AR, and the optimal mixing ratios were 100:50 (wet weight) for food wastes to AR and 100:30 (dry weight) for food wastes to sewage SL, respectively.

Keywords: Aged refuse; Bio-hydrogen production; Food waste (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:33:y:2008:i:12:p:2573-2579

DOI: 10.1016/j.renene.2008.02.018

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