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Post-composting

Get the most out of biowaste: Biogas, renewable energy, nutrients and organic matter/humus

Post-composting treatment steps

The delivered waste is fed into the fermentor as a substrate either directly or by mixing it with mixing water with a DM of 25% to 35%.

If necessary, inoculation material, which is removed at the end of the fermentation process, is added to the substrate. A thermophilic process takes place in the fermentor at up to 55°C. A gaseous energy source, methane gas, is produced using the natural biological fermentation process. This methane gas can be used in two ways. On the one hand, it can be fed directly into a CHP (combined heat and power plant) as biogas, or it can be further processed for use in vehicles. This treatment of the biowaste is carried out with the utmost consideration for people and the environment and exclusively in closed units that guarantee very low odor emissions. The output from the digester has a dry matter content of approx. 15% – 20% and is fed into a separation unit.

In this separation unit, the output is separated into solid and liquid fermentation residue. The liquid fermentation residue is either fed to agriculture as a liquid fertilizer  or as mash water to the substrate, which is fed into the fermentor. The solid fermentation residue is transported to the post-rotting stage to produce compost.

The fermentation residue is conditioned and sanitized in the post-rotting stage. The GORE® Cover is used here and reduces odor emissions to a minimum.

For this purpose, the output of the fermentor is brought to the area in front of the post-rotting stage using a wheel loader. By adding the fresh green waste, a faster aerobic rotting process is to be achieved to sanitize the material faster and to have reduced the water content far enough for compost processing.

Frequently asked questions about post-rotting process

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 to 35%.

  • Which waste can be fermented?

    The following waste can be fermented: Household biowaste & other biowaste, 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 to 35%.

  • Which waste can be fermented?

    The following waste can be fermented: Household biowaste & other biowaste, 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.

Industries

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.

Raw materials