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Eggersmann Recylingtechnology

BEKON Batch Fermenter

Discontinuous Process

Discontinuous fermentation is a safe and biologically stable process. All processes within the fermenter run completely automatically.

The Process

It is a single-stage process, the fermenters are filled either with a wheel loader or automatically using a tunnel feeder. All processes within the fermenter run automatically as standard. By feeding the tunnels at different times, an constant energy supply is guaranteed. To start the fermentation process immediately, the substrate is heated in an aerobic start phase and then inoculated with process liquid (percolate). No further mixing or feeding of additional substrate is necessary, as the fermenter is a closed circuit. The cell liquid that escapes during the process is collected by a drainage system, fed to the percolate fermenter and sprayed back into the fermenter from there. At the same time, wall and underfloor heating systems ensure a constant temperature so that the microorganisms involved in the process have perfect living conditions at all times. The fermenters are then emptied using a wheel loader.

Advantages of the Process

The process offers the following advantages:

  • Fermentation of separately collected biowaste and organic fraction from household waste possible
  • High biogas production
  • High economic efficiency 
  • High degree of automation 
  • High safety standard
  • Highest plant availability
  • No/hardly any pre-treatment of the substrate necessary
  • Simple operation
  • Base load-capable energy generation
  • Low energy requirement 
  • Nearly wastewater-free
  • No dewatering of the digestate

Perfect Structure for Composting

The discontinuous process produces digestate with very good structural properties and a comparatively low water content. As a result, the digestate can be stacked immediately after fermentation and are therefore ideal for aerobic conditioning and further processing into compost or fertiliser. The plants therefore set completely new standards for the production of biogas and compost.

  • Feeding by wheel loader

  • Automated feeding

Flexible With Modular Plant Concepts

The name "batch fermentation" refers to the fermentation of individual batches in different tunnels. The number of these fermenters is determined according to the expected throughput volume per year. The same principle applies to the downstream intensive composting tunnels. If the volume of waste increases at a later date, new digesters can simply be added. The modular concept therefore enables us to build customised plants. At the same time, it also ensures a high degree of flexibility during operation: it is also possible to ferment the organic fraction from household waste, whereby the tunnels can be used for either source-separated  organics or household waste without the need for conversion. The process is therefore ideal for regions where there is no separate collection of organic waste yet or where this is to be introduced in the foreseeable future.. Plant sizes from 10,000 to 150,000 tonnes per year can be realised.

Plant Structure

1. Flare · 2. Percolate fermenter · 3. Exhaust stack · 4. CHP 5. Pump sump · 6. Technical walkway · 7. Purging air / Exhaust gas · 8. Floor heating · 9. Wall heatingm · 10. Biogas storage · 11. Technical containers