An electrode-assisted anaerobic digestion process for the production of high-quality biogas
| Autor: | Keren Yanuka-Golub, Uri Gophna, R. Shechter, Judith Rishpon, A. Szczupak, Leah Reshef, Isam Sabbah, K. Baransi-Karkaby |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Chemistry 020209 energy 02 engineering and technology Biodegradable waste 010501 environmental sciences Pulp and paper industry 01 natural sciences Anaerobic digestion Bioreactors Biogas Bioenergy Biofuels 0202 electrical engineering electronic engineering information engineering Microbial electrolysis cell Sewage treatment Anaerobiosis Energy source Electrodes Methane 0105 earth and related environmental sciences Water Science and Technology Hydrogen production |
| Zdroj: | Water science and technology : a journal of the International Association on Water Pollution Research. 79(11) |
| ISSN: | 0273-1223 |
| Popis: | Biogas is a sustainable, renewable energy source generated from organic waste degradation during anaerobic digestion (AD). AD is applied for treating different types of wastewater, mostly containing high organic load. However, AD practice is still limited due to the low quality of the produced biogas. Upgrading biogas to natural gas quality (>90% CH4) is essential for broad applications. Here, an innovative bio-electrochemically assisted AD process was developed, combining wastewater treatment and biogas upgrading. This process was based on a microbial electrolysis cell (MEC) that produced hydrogen from wastewater at a relatively high efficiency, followed by high-rate anaerobic systems for completing biodegradation of organic matter and an in situ bio-methanation process. Results showed that CH4 production yield was substantially improved upon coupling of the MEC with the AD system. Interestingly, CH4 production yield increase was most notable once circulation between AD and MEC was applied, while current density was not markedly affected by the circulation rates. The microbial community analysis confirmed that the MEC enhanced hydrogen production, leading to the enrichment of hydrogenotrophic methanogens. Thus, directing soluble hydrogen from the MEC to AD is plausible, and has great potential for biogas upgrading, avoiding the need for direct hydrogen harvesting. |
| Databáze: | OpenAIRE |
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