HoSt built a co-digestion installation in Herk-de-stad, Belgium. Unique about this system is that the vegetable and animal material is digested and drained in seperate lines.

The vegetable line consists of a digester and after-digester. The material from the after-digester is separated into a solid and liquid fraction. The solid fraction is fed to the animal digester and then thickened together with the animal material. The concentrator uses heat from the CHP to reduce the volume of the digestate. The liquid fraction is used as a fertilizer material for agriculture.

Project Milestones

Start construction April 2008
Startup December 2009


Capacity 20,000 m³/year
Input Pig manure, corn, grass and other waste products
Digester(s) 2 x 2,945 m³
After-digester(s) 1 x 2,945 m³ + 2,945 m³ with after-storage
CHP(s) 1 x 1,000 kWe
Pre-storage/receipt 4 x 100 m³ polyester silos
Sanitation 10 m³ sanitation unit, 1 hour at 70°C
Solid feeding input 80 m³ mixing/dosing bin with input screws


  • Separate digestion lines for both plant and animal material
  • Utilization of CHP heat to thicken digestate

More information

Do you want to receive more information about our biogas plants, want to learn more about our anaerobic digestion technology or do you want to know what HoSt can do for you? Don’t hesitate to contact us through [email protected] or call us on +31 (0)53 – 460 90 80.