Methanogenesis under acidic pH conditions in a semi-continuous reactor system
Operating an anaerobic digester at low pH could offer several advantages over operation at neutral pH. Most wastewater streams targeted for anaerobic digestion are inherently acidic, requiring alkalinity supplementation (at added expense) to buffer the pH at neutral. Additionally, previously publish...
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| Veröffentlicht in: | Bioresource technology 2008-11, Vol.99 (17), p.8075-8081 |
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| creator | Taconi, Katherine A. Zappi, Mark E. Todd French, W. Brown, Lewis R. |
| description | Operating an anaerobic digester at low pH could offer several advantages over operation at neutral pH. Most wastewater streams targeted for anaerobic digestion are inherently acidic, requiring alkalinity supplementation (at added expense) to buffer the pH at neutral. Additionally, previously published work completed by the authors using batch systems suggested that lowering the system pH could increase methane production by as much as 30%. The goal of this research was to evaluate the feasibility of sustaining methanogenesis at low pH in a semi-continuous laboratory-scale fermentor. Significant methane production was achieved in a system ranging in pH from approximately 4.0–5.3. Results show that, if the consortium is allowed to sufficiently acclimate to acidic conditions, methanogenesis can be maintained under acidic pH conditions, resulting in overall chemical oxygen demand (COD) reduction and methane production comparable to that achieved in a neutral pH system. |
| doi_str_mv | 10.1016/j.biortech.2008.03.068 |
| format | Article |
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| fulltext | fulltext |
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| ispartof | Bioresource technology, 2008-11, Vol.99 (17), p.8075-8081 |
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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Acidophiles Anaerobic digestion Bioelectric Energy Sources Biological and medical sciences Biological treatment of sewage sludges and wastes Bioreactors Biotechnology Environment and pollution Fundamental and applied biological sciences. Psychology Hydrogen-Ion Concentration Industrial applications and implications. Economical aspects Methane Methane - metabolism Methanogenesis Oxygen - chemistry Time Factors |
| title | Methanogenesis under acidic pH conditions in a semi-continuous reactor system |
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