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Difference between revisions of "Anaerobic digestion"
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Usually, the produced biogas must be dried and drained for condense water and biological or chemical cleaned for H<sub>2</sub>S, NH<sub>3</sub> and trace elements. Further upgrading of the biogas to increase the CH<sub>4</sub> content could be realized by membrane separation of CO<sub>2</sub> and pressurising the biogas. | Usually, the produced biogas must be dried and drained for condense water and biological or chemical cleaned for H<sub>2</sub>S, NH<sub>3</sub> and trace elements. Further upgrading of the biogas to increase the CH<sub>4</sub> content could be realized by membrane separation of CO<sub>2</sub> and pressurising the biogas. | ||
A main distinction between anaerobic digestion (AD) technologies for treatment of municipal and industrial biodegradable wastes is the operating process solids content. '''Wet AD systems operate at low total solids (<10–20% TS) and dry systems have high operating solids (20–>40% TS)'''.<ref>{{Cite web|Author=Eleni Angelonidi, Stephen R. Smith|year=2015|title=A comparison of wet and dry anaerobic digestion processes for the treatment of municipal solid waste and food waste|e-pub date=09/11/2015|date accessed=09/03/2023|url=https://onlinelibrary.wiley.com/doi/abs/10.1111/wej.12130#:~:text=A%20main%20distinction%20between%20anaerobic,%E2%80%93%3E40%25%20TS).}}</ref> | |||
== Product == | == Product == | ||
Anaerobic digestion produces two valuable outputs, namely biogas and digestate. Biogas is composed of methane (CH<sub>4</sub>), which is the primary component of natural gas, at a relatively high percentage (50 to 75%), carbon dioxide (CO<sub>2</sub>), hydrogen sulfide (H<sub>2</sub>S), water vapor, and trace amounts of other gases. The energy in biogas can be used like natural gas to provide heat, generate electricity, and power cooling systems. Biogas can also be purified by removing the inert or low-value constituents (CO<sub>2</sub>, water, H<sub>2</sub>S, etc.) to generate renewable natural gas (RNG). This can be sold and injected into the natural gas distribution system, compressed and used as vehicle fuel, or processed further to generate alternative transportation fuel or other advanced biochemicals and bioproducts. | Anaerobic digestion produces two valuable outputs, namely biogas and digestate. Biogas is composed of methane (CH<sub>4</sub>), which is the primary component of natural gas, at a relatively high percentage (50 to 75%), carbon dioxide (CO<sub>2</sub>), hydrogen sulfide (H<sub>2</sub>S), water vapor, and trace amounts of other gases. The energy in biogas can be used like natural gas to provide heat, generate electricity, and power cooling systems. Biogas can also be purified by removing the inert or low-value constituents (CO<sub>2</sub>, water, H<sub>2</sub>S, etc.) to generate renewable natural gas (RNG). This can be sold and injected into the natural gas distribution system, compressed and used as vehicle fuel, or processed further to generate alternative transportation fuel or other advanced biochemicals and bioproducts. | ||