“Composting is a controlled, thermophillic process where organics degrade by micro-biological activity with the use of air, producing heat, carbon dioxide, water and biomass”.

The heat from the composting process is used to pasteurize (up to 70 oC) and dry the material, reducing volume and weight significantly and creating a stabile and sterile end product.
Christiaens composting technology is executed in completely closed (concete) vessels, so called tunnels.
In this way an optimal composting process, material pasteurization and odour management is guaranteed.
The tunnel composting proces is also called: In Vessel Composting (IVC).

Intensive mixing of the organic material (like turning as in windrows) does not  apply due to optimal oxygen and moisture distribution in the tunnels.
High compost stability rates can be achieved in the shortest possible time making the facility surface footprint as small as possible.

While compost is sterile after pasteurization it is safe to use and a valuable soil amendment.