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Hydrogen and methane yields of untreated, water-extracted and acid (HCl) treated maize in one- and two-stage batch assays

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)14401-14407
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number22
Publication statusPublished - Nov 2011
Publication typeA1 Journal article-refereed


In the present study, two-stage H2 and CH4 production was compared with one-stage CH4 production from maize subjected to water extraction and acid (HCl) treatment. In addition, the effect of duration (2 and 14 days) of the first-stage H2 process on the H2 yields and subsequent CH4 yields from the second-stage was also investigated. Results showed that the average H2 yields from untreated maize were 5.6 and 9.9 ml/g volatile solids added (VSadded) after 2 and 14 days, respectively. On the other hand, H2 yields from water-extracted and HCl-treated maize were 18.0 and 20.5 ml/gVSadded (14 d), respectively. On comparison to one-stage CH4 assays, the average increase in CH4 yields from two-stage assays with 2 d H 2 stage were 7, 9 and 27% for untreated, water-extracted and HCl-treated maize, respectively.


  • Anaerobic digestion, Hydrogen, Maize, Methane, Pre-treatment, Two-stage