The slurry tank serves as interim storage and a collecting container for liquid fertilizer. The size of the slurry tank must be sufficient for 2-3 days of manure and substrate accumulation. Reserves are beneficial. In the slurry tank, rough amounts of solids such as stones, which may not enter into the fermenter, can settle.
The merging of small amounts of solids and the feeding of the fermenter are carried out with a robust pump. Generally, an additional mixer is available in the slurry tannk to mix and to avoid floating layers. In some cases, it is possible to renounce the slurry tank and to introduce the manure directly into the fermenter.
Optionally, depending on the initial biomass, either an acceptance dispenser with a downstream extruder (BIOaccelerators) or a biofeeder with a downstream impact reactor (BIOacceleratorr) is used for pre-treatment.
The acceptance dispenser consists of an open container with an integrated scraper floor and milling drums. From the acceptance dispenser, the material passes through milling rollers and conveyors to enter the BIOaccelerators. In the BIOacceleratorr the material passes from the biofeeder through a screw system. (Exception: Farmer series).
The biofeeder also consists of an open container and transports the material using a so-called "Walking Floor". From the biofeeder, the material passes through milling drums to reach the BIOacceleratorr.
Biogas contains sulfur components which attack and destroy non-ferrous metals in the storage area of the combined heating and power plants. Therefore, the biogas must be de-sulfurized in the fermenter through
The CHP is operated using the biogas from the fermenter and, to a lesser extent, the biogas from the secondary fermenter/final storage.
The electrical energy produced in the CHP is fed into the municipal power grid and a small portion is consumed by the plant itself. A part of the thermal energy from the motor cooling and the flue gas heat exchanger is used to heat the fermenter and the secondary fermenter. The excess heat is used to dry the digestate. If insufficient heat is removed, the emergency CHP coolers are used to cool the motor.