6533b7dbfe1ef96bd1271302

RESEARCH PRODUCT

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

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Abstract In the present study, two-stage H 2 and CH 4 production was compared with one-stage CH 4 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 H 2 process on the H 2 yields and subsequent CH 4 yields from the second-stage was also investigated. Results showed that the average H 2 yields from untreated maize were 5.6 and 9.9 ml/g volatile solids added (VS added ) after 2 and 14 days, respectively. On the other hand, H 2 yields from water-extracted and HCl-treated maize were 18.0 and 20.5 ml/gVS added (14 d), respectively. On comparison to one-stage CH 4 assays, the average increase in CH 4 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.