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Effect of post-digestion temperature on serial CSTR biogas reactor performance

Abstract : The effect of post-digestion temperature on a lab-scale serial continuous-flow stirred tank reactor (CSTR) system performance was investigated. The system consisted of a main reactor operated at 55 degrees C with hydraulic retention time (HRT) of 15 days followed by post-digestion reactors with HRT of 5.3 days. Three post-digestion temperatures (55 degrees C, 37 degrees C and 15 degrees C) were compared in terms of biogas production, process stability, microbial community and methanogenic activity, The results showed that the post-digesters operated at 55 degrees C, 37 degrees C and 15 degrees C gave extra biogas production of 11.7%, 8.4% and 1.2%, respectively. The post-digester operated at 55 degrees C had the highest biogas production and was the most stable in terms of low VFA concentrations. The specific methanogenic activity tests revealed that the main reactor and the post-digester operated at 55 degrees C and 37 degrees C had very active acidogens and methanogens, In contrast, very low methanogenic activity was observed at 15 degrees C.
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https://hal.inrae.fr/hal-02667651
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Submitted on : Sunday, May 31, 2020 - 11:07:20 AM
Last modification on : Thursday, November 5, 2020 - 9:07:48 AM

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Kanokwan Boe, Dimitar Karakashev, Eric Trably, Irini Angelidaki. Effect of post-digestion temperature on serial CSTR biogas reactor performance. Water Research, IWA Publishing, 2009, 43 (3), pp.669-676. ⟨10.1016/j.watres.2008.11.037⟩. ⟨hal-02667651⟩

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