Biogas Digester

Product Description

Asutos Biogas Digester is the process in which bacteria biodegrade organic materials – such as solid animal manure, bio waste, and food waste – in the absence of oxygen (o2).

Biogas production in a Biogas Digester is done in gas-sealed units called digesters, which are designed and built in different forms and sizes depending on the types of feedstock and loading amount. These digester tanks contain complex bacterial cultures that break down (digest) the waste to produce biogas and digestate, which is the end product of the Anaerobic Digestion (AD) process.

Several types of organic materials (feedstocks) can be mixed together in one digester. This is known as Co-Digestion. Co-Digested substrates include manure, food waste, or crop residues. Co-digestion can increase biogas production from low-yielding or difficult-to-digest organic waste.

Outputs from Biogas Digester: Biogas and Digestate

Biogas consists of a relatively high percentage (50-75%) of methane (CH4), the main component of natural gas, as well as carbon dioxide (CO2), hydrogen sulfide (H2S), water vapor, and traces of other gases. Like natural gas, the energy contained in biogas can be used to generate heat and electricity. Also, biogas can also be purified by removing the inert or low-value components (CO2, water, H2S, etc.) to produce renewable natural gas. This can be sold and injected into the natural gas distribution system, compressed and used as vehicle fuel, or further processed to produce alternative fuels, energy products, or other advanced biochemicals and bioproducts.

Digestate is the leftover material after the digestion process. With appropriate treatment, the digestate can be used in many useful applications, as a nutrient-rich fertilizer, as an organically enriched compost, or simply as a soil improvement, in which case the farm can use it as a fertilizer on the fields. Digestate can be a source of revenue or cost-saving.