Biogas plants

HoSt is one of the leading suppliers of turn-key biogas plants. HoSt supplies industrial biogas installations for the digestion of 100% waste and farm-scale biogas installations for co-digestion of manure, energy crops and waste. In the biogas plants, organic material is being converted into biogas. A heat/power unit burns the biogas to convert it into Electricity and heat.

The digested material can be used as fertilizer in the farm-industry or it can be further post-treated. The fermentation-process makes the fertilizing value higher, because organically bound nutrients are released, like Nitrogen and phosphor. These materials are thus more readily available to the plant. By digesting waste or manure, there is a reduction or sometimes even a full extermination of pathogens and weed seeds.

HoSt installation BioZiedi

Installation at Bio Ziedi, Latvia

Fermentable materials

Almost all the organic materials can be digested. The most common digestion is manure digestion. Manure offers an optimal environment for digestion-bacteria.

Because of the good digestion characteristics of manure, other organic waste materials are often digested along with the manure. This is known as co-digestion. By co-digestion of manure with organic waste materials, the biogas production (and therefore the profitability of the installation), can be increased significantly.

Digestion of organic waste materials without manure is possible when the waste materials have a suitable structure. If waste materials do not have a suitable structure, the materials can be digested in combination with other waste materials or manure.

The dry matter and organic matter can vary by company. (Depends on the feeding system used)

For the biogas yield, the following factors are important:

  • Freshness of the material
  • In the case of co-digestion materials: degradability of the material
  • Residence time

    Wood Fired CHP Warmenhuizen

    Digester at Warmenhuizen, Netherlands


HoSt provides two different types of installations:

Both types of installations are finished with trapezoidal or with any other preferred finish. Depending on the structure of the material, HoSt can give advice about the best option for an installation.

Beside the digester, HoSt also provides pretreatment equipment, sanitation units for materials in category 2 and 3, finishing plants, biogas treatment, separate gas storage units and energy supply. HoSt can provide turn-key realisation of a complete project.

Farm-scale installation Tamminga

Example farm-scale installation Leeuwarden, Netherlands

biogas installation

Example industrial biogas installation BIR Lichtenvoorde, Netherlands

Thermal Pressure Hydrolysis

In the digestion process bacteria convert organic matter to biogas. This conversion can be improved by a preparation step called Thermal Pressure Hydrolysis (TPH). TPH breaks down structures which are difficult to convert by bacteria, such as lignin in plant material and cells in sludge (see figure below). This breakdown step makes the organic matter more available for the bacteria. Because of TPH the material is easier to convert, this improves the conversion rate and increases the biogas production.

Thermal Pressure Hydrolysis

‘Green’ Electricity

In a gas engine, the produced biogas can be converted into electricity and heat. The electricity that is produced by using this technique can be seen as sustainable, so the government can provide subsidy.

HoSt offers:

  • Feasibility studies
  • Experiments on laboratory-scale
  • Care of permit and subsidy application.
  • Basic- and detailed engineering
  • Project development
  • Turn-key delivery of biogas installations

Also, HoSt provides additional services:

  • Process analysis
  • Enzymes to optimize the fermentation process