Landfill techniques

The environmental companies of DEME now have more than 15 years of experience and a long tradition in constructing and capping landfills, enabling us to assist the client from the drafting of the design all the way to management and aftercare of the landfill.

Among other activities, we handle:

Conditioning of the substrate and groundwater monitoring
Earthworks
Double sealing (combination of mineral and synthetic seals) of soils and final profiles
Vertical seals with synthetic screens and/or cement-bentonite
Leak detection
Percolate drainage (granular layers, drainage tubes and collectors, bored wells and pumps)
Stabilisation
Gas valorisation
Final sealing
Water management
Buffer basins
Water purification system

This potential for wide-ranging specialisations and diverse technologies makes us a unique player in the market. We possess all the requirements to present our clients with a fitting solution without needing to call on third parties. We can perform all the work under our own management.

The composition of the soil of a disposal site is as follows: from right to left: clay layer - drainage layer for leak detection - HDPE film - drainage layer for percolate removal.

Technologies

Synthetic sealing

Both DEC and Ecoterres have certified welders (BCCA, founded by WTCB and SECO) to seal synthetic materials (polyethylene), membranes and pipes, to guarantee the highest quality of this welding work. All work is performed in accordance with a required quality monitoring plan that is presented to the client for approval.

Mineral seal: Trisoplast®

Besides the experience required for the employment of clay mats, natural clay and sand bentonite as mineral seals, DEC also has exclusive rights in Belgium to use Trisoplast®. This mixture of sand, bentonite and a polymer is then processed according to a set protocol so that the highest possible quality is always guaranteed. Quality monitoring applies to raw materials, the mixture and the installed sealing layer. The very low water permeability of Trisoplast® (10-10 m/s) allows for the formation of layer thicknesses of approx. 10 cm more than other feasible alternatives for clay layers of 50 cm.

Gas valorisation – biogas extraction

The installation of gas pipe networks to extract biogas from landfills. The extraction of biogas using filter elements, both horizontal and vertical, is one of our specialities. The biogas is then incinerated (gas torch) or utilised (gas engine).

Would you like to know more?

View some of the projects we have completed using this technique.