Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 16, Issue 5, Pages 9540-9556Publisher
MDPI
DOI: 10.3390/ijms16059540
Keywords
biohydrogen; photosynthetic bacteria; real-field wastewater; dark-photo fermentation
Funding
- University Grant Commission (UGC)
- Council of Scientific and Industrial Research (CSIR)
- CSIR SETCA [CSC-0113]
- CSIR BioEn [CSC-0116]
- Ministry of New and Renewable Energy [103/131/2008-NT]
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Harnessing hydrogen competently through wastewater treatment using a particular class of biocatalyst is indeed a challenging issue. Therefore, biohydrogen potential of real-field wastewater was evaluated by hybrid fermentative process in a single-stage process. The cumulative hydrogen production (CHP) was observed to be higher with distillery wastewater (271 mL) than with dairy wastewater (248 mL). Besides H-2 production, the hybrid process was found to be effective in wastewater treatment. The chemical oxygen demand (COD) removal efficiency was found higher in distillery wastewater (56%) than in dairy wastewater (45%). Co-culturing photo-bacterial flora assisted in removal of volatile fatty acids (VFA) wherein 63% in distillery wastewater and 68% in case of dairy wastewater. Voltammograms illustrated dominant reduction current and low cathodic Tafel slopes supported H-2 production. Overall, the augmented dark-photo fermentation system (ADPFS) showed better performance than the control dark fermentation system (DFS). This kind of holistic approach is explicitly viable for practical scale-up operation.
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