Topic
Biogas
About: Biogas is a research topic. Over the lifetime, 28571 publications have been published within this topic receiving 498545 citations.
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01 Jan 2006
TL;DR: Future research needs include the optimization of the anaerobic biofiltration process, the development of a system combining the advantages of phototrophic and chemotrophic bacteria and the possible co-removal of siloxanes within this process.
Abstract: Syed, M., Soreanu, G., Falletta, P. and Beland M. 2006. Removal of hydrogen sulfide from gas streams using biological processes A review. Canadian Biosystems Engineering/Le genie des biosystemes au Canada 48: 2.1 2.14. Hydrogen sulfide (H2S) is a toxic and odorous compound present in biogas produced by the anaerobic digestion of biosolids and other organic materials. Due to its corrosive nature in internal combustion engines, biological hydrogen sulfide removal processes are being investigated to overcome the chemical and disposal costs associated with existing chemically-based removal processes. Both phototrophic and chemotrophic bacteria are suitable candidate microorganisms for hydrogen sulfide bioxidation. Phototrophic C. limicola is an ideal bacterium in these biological removal processes due to its ability to grow under anaerobic conditions using only inorganic substrates and a light source and its efficient extracellular production of elemental sulfur from H2S. Phototrophic fixed-film reactors are an interesting concept for cost-effective H2S removal from biogas due to their ability to operate for long periods of time without requiring a biomass separation step and their ability to operate under higher and variable loadings. However, a light source is one of the key constraints for this process. Chemotrophic bacteria can also be used in fixed-film reactors to produce elemental sulfur instead of sulfate under controlled oxygen conditions. These bioscrubbers are gaining acceptance for treating hydrogen sulfide containing gases from a wide variety of sources such as biogas, off-gases from wastewater treatment plants, livestock farms, etc. The biofilter medium is inexpensive and may contain sufficient micro-nutrients for the microbial communities. Future research needs include the optimization of the anaerobic biofiltration process, the development of a system combining the advantages of phototrophic and chemotrophic bacteria and the possible co-removal of siloxanes within this process.
274 citations
TL;DR: The results indicate that the anaerobic acidogenic conversion of glucose can produce hydrogen, and the hydrogen productivity of the sludge is comparable to that of an enrichment culture.
Abstract: Experiments on hydrogen production using chemostat-type anaerobic digesters were conducted. The results indicate that the anaerobic acidogenic conversion of glucose can produce hydrogen. The hydrogenic activity of acclimated anaerobic sewage sludge is high at a short solids retention time (SRT) and low pH. At pH 5.7, SRT 0.25 days and an organic loading rate of 416 mmol-glucose dm−3 day−1, each mole of glucose in the mesophilic acidogenic reactor can produce 1.7 mol of hydrogen; each gram of biomass produces 0.456 mole of hydrogen per day. Moreover, the hydrogen productivity of the sludge is comparable to that of an enrichment culture.
© 1999 Society of Chemical Industry
274 citations
TL;DR: Alternative methods for determining the anaerobic biodegradability of solid waste are presented and spectroscopy techniques seem to be useful for determining biodegradation, in particular by taking into account the interaction between different molecules in the organic matter.
271 citations
TL;DR: A combination of acetate, propionate and biogas production is an effective combination to monitor this type of digesters effectively, and pH was relatively stable and did not show clear response to hydraulic load changes.
270 citations
TL;DR: The best performance for food waste biodegradation and methane generation was the reactor with 20% of total solid and 30% of inoculum: give rise to an acclimation stage with acidogenic/acetogenic activity between 20 and 60 days and methane yield of 0.49L CH4/g VS.
269 citations