Potential and characteristics of bio-H2 production from brewery wastewater by a maltose-preferring butyrate-type producer: Investigation in batch and semi-continuous cultures
2022
Wang, Yuqi | Chen, Mengyao | Xu, Jingna | Qi, Nan | Dong, Lili | Cao, Guangli | Zhao, Xin
In the context of “Peak CO₂ emissions & Carbon neutrality”, H₂ energy, as the green and clean energy, will make an important contribution to the carbon emission reduction and carbon neutralization. Bio-H₂ production from organic wastewater achieved not only pollutants removal, but also the H₂ energy recovery and carbon emission reduction. In this study, a maltose-preferring producer of Clostridium butyricum NH-02 was investigated for the potential and performance of bio-H₂ production from brewery wastewater in batch and semi-continuous fermentation. Appropriate initial pH 7.0 and organic loading of 21,173 mg/L chemical oxygen demand (COD) (2670 mg/L reducing sugar (RS)) stimulated the batch H₂ fermentation efficiency with a maximum H₂ yield of 1.89 mol-H₂/mol-RS and cumulative H₂ production of 479.3 mL/L. Comparing to the batch fermentation, semi-continuous fermentation showed significant improvement in H₂ productivity and yield. The maximum cumulative H₂ yield of 5.21 mol-H₂/mol-RS and production of 254.78 mL were obtained with the optimal hydraulic retention time (HRT) at 47 h after a 120 h fermentation. This study demonstrated the potential of H₂ production from brewery wastewater with C. butyricum, and a great improvement in H₂ production in semi-continuous fermentation.
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