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Methanogenic capacity and robustness of hydrogenotrophic cultures based on closed nutrient recycling via microbial catabolism: Impact of temperature and microbial attachment.

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Title: Methanogenic capacity and robustness of hydrogenotrophic cultures based on closed nutrient recycling via microbial catabolism: Impact of temperature and microbial attachment.
Authors: Savvas, Savvas1 savvas.savvas@southwales.ac.uk, Donnelly, Joanne1, Patterson, Tim1, Chong, Zyh Siong2, Esteves, Sandra R.1
Source: Bioresource Technology. Jun2018, Vol. 257, p164-171. 8p.
Subjects: Microbial metabolism, Biofilms, Nutrient cycles, Microbial cultures, Temperature effect
Abstract: A biological methanation system based on nutrient recycling via mixed culture microbial catabolism was investigated at mesophilic (37 °C) and thermophilic (55 °C) temperatures. At mesophilic temperatures, the formation of biofilms on two different types of material was assessed. Results showed that with intense mixing the biofilm reactors presented methanogenic capacities (per working volume) 50% higher than the ones operated with suspended cultures. Gas feeding rates of 200 L/L/d were achieved at a H 2 /CO 2 to CH 4 conversion efficiency of above 90% by linking two reactors in series. Furthermore the robustness of the cultures was assessed under a series of inhibitory conditions that simulated possible process interferences at full scale operation. Full recovery after separate intense oxygenation and long starvation periods was observed within 2–5 days. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A biological methanation system based on nutrient recycling via mixed culture microbial catabolism was investigated at mesophilic (37 °C) and thermophilic (55 °C) temperatures. At mesophilic temperatures, the formation of biofilms on two different types of material was assessed. Results showed that with intense mixing the biofilm reactors presented methanogenic capacities (per working volume) 50% higher than the ones operated with suspended cultures. Gas feeding rates of 200 L/L/d were achieved at a H 2 /CO 2 to CH 4 conversion efficiency of above 90% by linking two reactors in series. Furthermore the robustness of the cultures was assessed under a series of inhibitory conditions that simulated possible process interferences at full scale operation. Full recovery after separate intense oxygenation and long starvation periods was observed within 2–5 days. [ABSTRACT FROM AUTHOR]
ISSN:09608524
DOI:10.1016/j.biortech.2018.02.109