High solid temperature phased anaerobic digestion from agricultural wastes: Putting several reactors in sequence

Abstract : High solid anaerobic digestion of agricultural wastes (manure and grass silage) was tested on temperature phased anaerobic digester (TPAD) at lab-scale. A 4 days hyperthermophilic hydrolysis was followed by a 15 days methanogenesis. The TPAD was divided into 4 or 5 tanks in series without recycling: 2 sectors for hydrolysis (2 days HRT each) and 2 or 3 sectors for methanogenesis (5 + 10 or 3 × 5 days HRT). Two different combinations of temperatures (65 °C–37 °C, 65 °C–55 °C) were investigated to assess the process efficiency. For all tested conditions, the TPAD operated steadily with a methane productivity of 235 +/−3 mLCH4STP gVS−1. Using four or five reactors in series enabled to identify that during the two first days of hydrolysis, the hydrolysis yield and acidification yield were much higher (22% and 13%, respectively) than during the next two days (2% and 2% respectively). Moreover, concerning methanogenesis it appeared that the retention time may be shortened by 5 days with little loss in methane production (11%). In the methanogenic sectors, the uptake of volatile fatty acids and the methane production were higher at 55 °C than 37 °C. The results suggest that the hydrolytic sector could be limited at 2 days HRT, while the methanogenic sector would support a 10 days HRT with the feedstocks used.
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https://hal.archives-ouvertes.fr/hal-01743270
Contributor : Pierre Buffière <>
Submitted on : Monday, March 26, 2018 - 12:53:38 PM
Last modification on : Thursday, June 13, 2019 - 10:09:24 AM

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M. Dooms, H. Benbelkacem, Pierre Buffière. High solid temperature phased anaerobic digestion from agricultural wastes: Putting several reactors in sequence. Biochemical Engineering Journal, Elsevier, 2018, 130, pp.21 - 28. ⟨10.1016/j.bej.2017.11.011⟩. ⟨hal-01743270⟩

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