Production of hydrogen and methane from potatoes by two-phase anaerobic fermentation
2008
Xie, Binfei | Zheng, Run | Zhou, Junhu | Song, Wenlu | Liu, Jianzhong | Cen, Kefa
A two-phase anaerobic process to produce hydrogen and methane from potatoes was investigated. In the first phase, hydrogen was produced using heat-shocked sludge. About 12h lag-phase vanished, hydrogen yield increased from 200.4ml/g-TVS to 217.5ml/g-TVS and the maximum specific hydrogen production rate also increased from 703.4ml/g-VSSd to 800.5ml/g-VSSd when improved substrate was used, in which Cl⁻ was substituted for [formula removed]. Better performances of 271.2ml-H₂/g-TVS and 944.7ml-H₂/g-VSSd were achieved when potatoes were pretreated by α amylase and glucoamylase. In the second phase, methane was produced from the residual of the first phase using methanogens. The maximum additional methane yield was 157.9ml/g-TVS and the maximum specific methane production rate was 102.7ml/g-VSSd. The results showed that the energy efficiency increased from about 20% (hydrogen production process) to about 60%, which indicated the energy efficiency can be improved by combined hydrogen and methane production process.
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