Journal
BIORESOURCE TECHNOLOGY
Volume 305, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122900
Keywords
Photo-fermentation biohydrogen production; Starch agricultural leftover; Initial pH; Electron balance
Funding
- National Natural Science Foundation of China [51806061, 51676065]
- Key Scientific Research Project of Colleges and Universities in Henan Province [18A480004]
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Starch agricultural leftover is a potential substrate for photosynthetic bacteria to produce hydrogen. In this work, the effect of initial pH on photo-fermentation biohydrogen production process and electron balance were investigated. The modified Gompertz model was adopted, and hydrogen yield, sugar consumption and metabolite evolution were monitored with initial pH varying from 5 to 9. Results showed that hydrogen was produced mainly through acetic acid and butyric acid metabolism pathways when starch taken as carbon source. It was found that the maximum hydrogen yield (642 +/- 22 mL) and highest hydrogen production rate (77.78 mL/(L.h)) were obtained at initial pH of 7. 37.65% substrates electrons diverted towards hydrogen. Lower hydrogen yield, hydrogen production rate and lower electrons diversion were obtained at other initial pH levels. Also, the lag phase time was 0.04 h when pH was 7, which was significantly lower than other levels.
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