Biogas plants
How a biogas plant works:

In the simplest case, the sewage flows directly from the stall into a preliminary channel. This channel is installed in order to allow the mixing of the individual substrates (sewage, solid waste and other organic materials) as well as to guarantee a continual loading of the fermenter through pumps. One can also introduce solid raw materials independently of the preliminary channel with appropriate conveyor equipment (according to the customer's wishes, please see Sewage technology> conveyor technology for solids). The way raw materials are introduced is then dependent on the type and amount of the substance to be fermented and is also specified by the customer.

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The actual "biogas process" takes place in the so-called fermenter, a sewage container that must be airtight and opaque and is either made of steel or concrete (customer-specified)). The sewage introduced into the fermenter is heated. The process temperature is usually kept in the mesophile range, that is, between 33 and 40 °C. It’s important to have a constant temperature in the fermenter. A wide range of anaerobic micro-organisms take part in this controlled biogas creation process and the relative proportions between them is influenced by the materials being fermented, Ph-values, temperature and the fermentation process itself. Almost all organic substances can be broken down by fermentation because of the ability of these microorganisms to adapt to the process’ conditions.

The "BIOGAS" that is created is then fed into a combustion engine and serves as fuel. Two types of combustion engine can be used here - a diesel spark ignition engine or a pure gas engine (depending on what the customer wants). This so-called combined heat and power station, which features power-heat cogeneration, now runs with biogas as a fuel and at the same time powers a generator that delivers electricity. This can be used to meet the customer's own needs or can be sold to an electricity company. Many biogas plant operators use the engine heat generated in cooling and exhaust gas to heat their stalls and apartments. The heat is already used to warm up the sewage in the fermenter.

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