Co-fermentation of sewage sludge and algae and Fe2+ addition for enhancing hydrogen production |
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Authors: | Yanan Yin Yang Chen Jianlong Wang |
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Affiliation: | 1. Tsinghua University -- Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology, INET, Tsinghua University, Beijing 100084, PR China;2. Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, PR China;3. Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing, 100084, PR China |
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Abstract: | Co-fermentation of sewage sludge and algae was performed for enhancing the hydrogen production, and the effect of Fe2+ on co-fermentation process was examined. Results showed that both co-fermentation process and Fe2+ addition promoted hydrogen production. Highest hydrogen production of 28 mL/100 mL (14.8 mL H2/g VSadded) was obtained from the co-fermentation group with 600 mg/L Fe2+ addition, which was 2.15 times, 2.00 times and 1.87 times of mono-fermentation of sludge, mono-fermentation of algae, and the co-fermentation group without Fe2+ addition. Both volatile solids and protein degradation were stimulated by co-fermentation process. Microbial analysis showed that co-fermentation groups with Fe2+ addition enriched Clostridium sensu stricto 13, Clostridium tertium and Terrisporobacter, which were positively correlated with cumulative hydrogen production. This study suggested that the co-fermentation of sludge and algae in the presence of Fe2+ could significantly improve the hydrogen production by stimulating the hydrogen-producing metabolism. |
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Keywords: | Biohydrogen Co-fermentation Sewage sludge Algae Ferrous ion Microbial distribution |
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