Removing these compounds from biogas increases the energy value of the biogas. Low quality biogas is typically used in tougher, less efficient engines, such as internal combustion engines. Higher quality biogas cleaned of trace contaminants can be used in more efficient, but also more sensitive engines.
Biogas treated to meet pipeline quality standards can be distributed through the natural gas pipeline and used in homes and businesses. Digestate is the material that is left over following the anaerobic digestion process.
Digestate can be made into products like:. When properly processed, dewatered digestate can be used as livestock bedding or to produce products like flower pots. Digestate can be directly land applied and incorporated into soils to improve soil characteristics and facilitate plant growth. Acidogenic bacteria then convert the sugars and amino acids into carbon dioxide, hydrogen, ammonia, and organic acids. Acetogenic bacteria then convert these resulting organic acids into acetic acid, along with additional ammonia, hydrogen, and carbon dioxide.
Finally, methanogens convert these products to methane and carbon dioxide. Many different anaerobic digester systems are commercially available.
The following is an overview based on organic waste stream type manure, municipal wastewater treatment, industrial wastewater treatment and municipal solid waste : Manure: Anaerobic digestion systems for livestock manure operate to reduce methane emissions, odors, pathogens and weed seeds and produce biogas.
They fall into four general categories:. Sealed with flexible cover, with methane recovered and piped to the combustion device. Share sensitive information only on official, secure websites. JavaScript appears to be disabled on this computer. Please click here to see any active alerts. Anaerobic digestion is a process through which bacteria break down organic matter—such as animal manure, wastewater biosolids, and food wastes—in the absence of oxygen.
Anaerobic digestion for biogas production takes place in a sealed vessel called a reactor, which is designed and constructed in various shapes and sizes specific to the site and feedstock conditions learn more about AD system design and technology.
These reactors contain complex microbial communities that break down or digest the waste and produce resultant biogas and digestate the solid and liquid material end-products of the AD process which is discharged from the digester.
Each stage breaks the matter into smaller and smaller parts, until the only remaining substances are methane, carbon dioxide and water, three very simple molecules. At the end of the process we have a mixture of methane and carbon dioxide gases biogas , water and some organic material digestate.
Biogas can be used to produce heat and electricity. It can be used in combined heat and power CHP gas engines or it can be burned to produce heat only. Alternatively, biomethane can be produced by removing the carbon dioxide from the biogas.
The biomethane has many valuable uses. It can be injected into the gas grid as a renewable replacement for natural gas or it can be used as vehicle fuel. Digestate is a nutrient-rich substance which contains high amounts of nitrogen and phosphate that has value as an agricultural fertiliser or soil conditioner.
There are two main benefits of Anaerobic Digestion. It can have a positive impact on the environment, and it can provide direct financial returns. Our in-house team is knowledgeable in the industry and can provide advice on the grants and incentives available within both the UK and ROI.
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