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Post-composting

Get the maximum out of organic waste: Biogas, renewable energy, nutrients and organic matter/humus.

Post-composting treatment steps

The delivered waste will be added into the fermenter as a substrate either directly or by being blended with tempering water with a DS of between 25 % and 35 %.

If required, an inoculum, which will be extracted at the end of the fermentation process, is added to the substrate. A thermophilic process of up to 55 °C takes place inside the fermenter. Using a natural biological fermentation process, a gaseous source of energy, methane gas, is hereby produced. Thin menthane gas can be used in two ways. On the one hand, it can be directly fed into a CHP (combined heat and power unit) as a biogas and it will be further processed to be used by vehicles. This biological waste treatment os conducted whilst taking humans and the environment into consideration thanks to the closed units which ensure very low odour emissions. The output from the fermenter has a DS of approximately 15 % – 20 % and will be added to a separating unit.

In this separating unit, the output will be separated between solid and a liquid digested residue. The liquid digestate will either be supplied to the agriculture industry as liquid fertiliser or added to the soil put into the fermenter as tempering water. The solid digestate is transported to a further decomposition facility to produce compost.

Conditioning and hygienisation are conducted in the further decomposition process. The GORE® Cover is used here and reduces odor emissions to a minimum.

For this purpose, the output from the fermenters is brought before the further decomposition facility using a wheeled loader on the surface. Through mixing in the fresh green waste, a quicker, aerobic rotting process should be conducted in order to faster hygienise the material and to reduce the water content of the material enough for compost conditioning.

Frequently asked questions about post-rotting

Post-composting

  • What is fermentation?

    Fermentation is the conversion of biological materials using bacterial, fungal or cell cultures in the absence of air.

  • Which processes are suitable for fermenting biowaste?

    Only solid matter fermentation processes or dry fermentation processes are suitable for fermenting biowaste. The dry matter (DM) must be 25 - 35 %.

  • Which waste can be fermented?

    The following waste can be fermented: Household biowaste & other organic waste, such as grass clippings and garden waste & agricultural residues.

  • What substances can be recovered from a fermentation plant?

    Biogas, compost, liquid fertilizer and "sewage sludge compost" via a post-rotting process.

Frequently asked questions about post-rotting

Post-composting

  • What is fermentation?

    Fermentation is the conversion of biological materials using bacterial, fungal or cell cultures in the absence of air.

  • Which processes are suitable for fermenting biowaste?

    Only solid matter fermentation processes or dry fermentation processes are suitable for fermenting biowaste. The dry matter (DM) must be 25 - 35 %.

  • Which waste can be fermented?

    The following waste can be fermented: Household biowaste & other organic waste, such as grass clippings and garden waste & agricultural residues.

  • What substances can be recovered from a fermentation plant?

    Biogas, compost, liquid fertilizer and "sewage sludge compost" via a post-rotting process.

Find your industry

The right solution for any industry

Industries

The right solution for any industry

UTV AG helps to provide a sustainable solution in a wide variety of areas. From entire municipalities and agriculture to fermentation plants and landfill operators, we support our customers in achieving their goals.

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Find your raw materials

Raw materials for biological treatment

Raw materials

Raw materials for biological treatment

UTV systems can be used to successfully compost a wide variety of raw materials, such as green waste from gardens and parks, kitchen waste and food waste, as well as animal by-products, solids from fermentation, agricultural residues, mixed waste and organics from residual waste, sewage sludge and waste from food production.

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