Using Waste Products As Building Material for Landfill Closure and Construction of a Sediment Treatment Plant
Type:
Presented during:
WODCON XX: "The Art of Dredging" - 2013, Brussels, Belgium
Authors:
Pallemans I, Van Zele S, Nachtergaele K
Abstract: An old clay pit in Moen (Belgium), exploited by Imog, an intermunicipal company, was being used for land filling of domestic and industrial waste. Once full capacity was reached, the waste needs to be capped with successively impermeable membranes, an impermeable mineral layer and a drainage layer. Likewise, the bottom layer of a sediment dewatering lagoon needs to be capped the same way. Therefore the idea was developed to construct a sediment treatment plant on top of the old landfill, taking into account that it is located next to the Canal “Bossuit-Kortijk”, which significantly facilitates the supply of dredged sediments to be treated on the site. Imog awarded this project to the joint venture Jan De Nul – Envisan.
The use of residual products were maximised to form the different capping layers: the drainage layer is build up out of KSP-glass, which is a residual from the glass recycling industry and is a mixture of ceramics, stones, porcelain and glass. The impermeable layer is entirely made out of Hydrostab®, a mixture of sludge from water treatment plants, sands, fly ash and water glass. This mineral layer replaces the use of the layer of natural clay. The dewatering fields are constructed with recycled dredged sediments and treated soils from remediation projects.
Depending on the quality of the sediments dewatered in the constructed lagoons, they can be used for further coverage of the area or they can be disposed in the still operational part of the landfill, if the sediments turn out to be too contaminated. Regardless of the quality of the material, transportation and associated costs and energy use will be substantially reduced.
Keywords: Sediment treatment, recycled dredged sediments, dewatering, waste products