The following operations take place at Indaver’s Grimbergen site: 

  • Treatment of green waste to produce valuable compost with the Vlaco label (until 30/09/2023)
  • Biomass production  (until 30/9/2023)
  • VGF waste transfer  (until 30/9/2023)
  • Domestic waste transfer 
  • Bulky waste transfer 



Treatment of green waste to produce compost and biomass

At Indaver’s Grimbergen site, green waste (prunings, roadside grass cuttings, tree trunks, organic industrial waste and green vegetation waste from local authorities, contractors and gardeners are treated to produce biomass and compost. Some 25,000 tonnes of green waste are delivered annually, from which about half are composted. About a fifth of the incoming materials are disposed of as biomass after processing. 

The green waste is shredded and turned several times, during which it undergoes an aerobic composting process. These broken down materials are then screened. The fine fraction is the compost, the coarser woody fraction is the biomass. This biomass is transported by Indaver Logistics to a biomass power station where it undergoes a thermal conversion process to generate green electricity and heat.  

Any remaining components liable to cause damage (plastics, stones, metals) are removed mechanically or manually. The residual fraction, such as plastics goes to the company’s own Grate incinerator waste-to-energy power station in Doel. 

The compost is used as high-quality certified compost, mainly in agriculture and horticulture in neighbouring districts. 

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Approval mark for compost

Indaver monitors the quality of the biowaste that comes in for treatment and leaves its sites in turn as high-quality compost. It will only allow compost to find its way into agriculture and horticulture if all strict environmental requirements are met. 

Vlaco, the Flemish Compost Organisation, monitors biowaste treatment quality for OVAM, the Flemish Public Waste Agency. Companies with a Vlaco certificate are permitted to use their end product as a fertiliser or soil improver. Vlaco monitors not only the end product but also the input streams and the process itself. 

Accordingly, companies producing Vlaco compost meet all the environmental requirements in VLAREMA, the Flemish legislation on materials management.  
Indaver has an approval certificate for Vlaco compost.

VGF waste, household waste and bulky waste transfer

In Grimbergen, VGF waste from the surrounding districts is also transferred and transported to various composting facilities in Flanders, where it is converted into compost.  

This is also where residual waste from some Flemish-Brabant households is transferred and transported to our Doel site, where it is used to generate electricity and steam in the grate incinerators. 

Bulky waste from the waste collection centres in neighbouring districts is transferred in Grimbergen and transported to our Doel site, where it is used to generate electricity and steam in the fluidised bed incinerators.