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Difference between revisions of "Anaerobic digestion"
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Anaerobic digestion
Bas Davidis (talk | contribs) (Intro anearobic digestion) |
Bas Davidis (talk | contribs) (Anaerobic digestion) |
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Anaerobic digestion is a process through which micro-organisms break down organic matter, such as animal manure, wastewater biosolids, and food wastes, in the absence of oxygen. Anaerobic digestion intended for biogas production takes place in a sealed tank (called an anaerobic digester), which is designed and constructed in various shapes and sizes specific to the site and feedstock conditions. These sealed vessels contain complex microbial communities that break down the waste and produce biogas and digestate (i.e., the solid and liquid material end-products of the process). | |||
== Feedstock == | |||
== Process and technologies == | |||
=== Process === | |||
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. | |||
== 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. | |||
The digestate can be used in many beneficial applications provided that is is appropriately treated post processing. This could be in form of animal bedding, nutreint-rich fertilizer, organic-rich compost, or as soil amendment. | |||
== Technology providers == | |||
=== CCS === | |||
=== Biogas plus === | |||
=== Host === | |||
=== Planet Biogas === | |||
=== Envitec === | |||