Contractor Sodraep started a project in Brussels and used lorries to dispose of the sludge, i.e. the sludge was transported with water. At the time, the contractor did not consider this to be a good idea, and therefore instructed a supplier to look for a suitable flocculant so that the sludge could be effectively dewatered before it was transported. The contractor subsequently purchased Geotubes® and wanted to receive advice about the best approach.
Pooling ideas about sludge processing
Ton Broeders from Promeco visited the site, assessed the situation and contributed ideas to the design of a flowchart. He compiled a mass flow balance. This enabled Ton to select the correct pumps and the correct sizes for the pipes.
In Brussels, tens of concrete piles were drilled into the ground down to a maximum depth of thirty metres using an ingenious system. The piles are one metre in diameter. A continuous layer of concrete is located on top of this, but still eight metres below ground level. All of the soil and sludge that had to be removed amounted to approximately 8,000 cubic metres. After it was above ground level, all of the sludge had to be dewatered in order transport it through Brussels; Promeco was deployed for this project. The sludge flow was conditioned by Ton Broeders from Promeco in such a way that it was quickly dewatered in the Geotubes®.