Biohydrogen from thermophilic co-fermentation of swine manure with fruit and vegetable waste: maximizing stable production without pH control |
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Authors: | Tenca A Schievano A Perazzolo F Adani F Oberti R |
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Affiliation: | a Department of Agricultural Engineering, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy b Department of Crop Science, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy |
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Abstract: | Hydrogen production by dark fermentation may suffer of inhibition or instability due to pH deviations from optimality. The co-fermentation of promptly degradable feedstock with alkali-rich materials, such as livestock wastes, may represent a feasible and easy to implement approach to avoid external adjustments of pH.Experiments were designed to investigate the effect of the mixing ratio of fruit-vegetable waste with swine manure with the aim of maximizing biohydrogen production while obtaining process stability through the endogenous alkalinity of manure.Fruit-vegetable/swine manure ratio of 35/65 and HRT of 2 d resulted to give the highest production rate of 3.27 ± 0.51 LH2 L−1 d−1, with a corresponding hydrogen yield of 126 ± 22 mLH2 g−1VS-added and H2 content in the biogas of 42 ± 5%. At these operating conditions the process exhibited also one of the highest measured stability, with daily productions deviating for less than 14% from the average. |
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Keywords: | Biohydrogen Swine manure Fruit and vegetables waste Co-fermentation Response surface analysis |
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