Production of biogas through anaerobic digestion (AD) of animal manure and slurries as well as of a wide range of digestible organic wastes, converts these substrates into renewable energy and offers a natural fertilizer for agriculture.

AD is a microbiological process of decomposition of organic matter, in the absence of oxygen, common to many natural environments and largely applied today to produce biogas in airproof reactor tanks, commonly named digesters. A wide range of micro-organisms are involved in the anaerobic process which has two main end products: biogas and digestate.
Biogas is a combustible gas consisting of methane, carbon dioxide and small amounts of other gases and trace elements.

Biogas is a flexible energy carrier, suitable for many different applications. One of the most usual applications is for combined heat and power generation (CHP). A wide range of biomass types can be used as substrates (feedstock) for the production of biogas from AD. The most common biomass categories used in biogas production are:

– Animal manure and slurry
– Agricultural residues and by-products
– Digestible organic wastes from food and agro industries (vegetable and animal origin)
– Organic fraction of municipal waste and from catering (vegetable and animal origin)
– Sewage sludge
– Dedicated energy crops (e.g. maize, miscanthus, sorghum, clover).

The process of biogas formation is a result of linked process steps, in which the initial material is continuously broken down into smaller units. Specific groups of micro-organisms are involved in each individual step. These organisms successively decompose the products of the previous steps. The four main process steps are:


Berman bes, through its expertise and experience, offers a wide range of supplies relating to a power plant in all stages of energy production from biomass anaerobic digestion.