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 H2/CO2 to CH4 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.
Original language | English |
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Article number | S0960852418303067 |
Pages (from-to) | 164-171 |
Journal | Bioresource Technology |
Volume | 257 |
Early online date | 24 Feb 2018 |
DOIs | |
Publication status | Published - 1 Jun 2018 |
Keywords
- Hydrogenotrophic methanogenesis
- Biofilm
- Power to gas
- Energy storage