Beneficial Reuse: From Landfill to a Country Park

Beneficial Reuse: From Landfill to a Country Park

Grimsby | NAUE GmbH & Co. KG

Bentofix® GCL used for landfill capping

The seaside town of Grimsby is located in the northeast of England, situated on the south side of the Humber Estuary. Grimsby is famous for its fishing heritage and remains today an important fish and food processing centre. The town also boasts a thriving chemical and gas power industry.

In 2013, the North East Lincolnshire Planning Committee approved the application by landowner Millennium Park to decontaminate a 23.7-hectare former landfill site and convert it into an exemplary, beneficial reuse project: a country park.

The development, located in the centrally located West Marsh area of Grimsby, promised 23 hectares of parks, wild life zones, fountains, children’s play areas, and open spaces.

Due to the end use being a recreational area, it was important to make sure the capping system was robust, flexible, self-sealing and a proven gas barrier and low permeability barrier to infiltration of water. Also, the beneficial reuse of the site and the enhanced protections that came with that approval meant that multiple types of geosynthetic clay liners (GCLs), also known as bentonite mats, were specified. Each type was selected according to the specific zone’s design and functional needs.

Grimsby | NAUE GmbH & Co. KG

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For 6.5 hectares of the site, a GCL was installed to secure the land on which the main recreation facilities would be constructed. The GCL contains high-swelling, high-quality powdered sodium bentonite and is manufactured with needlepunch and Thermal Lock (enhanced shear strength) technologies; the BFG 5000 type was specified and used for the recreational facility area for its complete impregnation of bentonite in the nonwoven cover geotextile to self-sealing overlaps to ensure a continuous barrier, and its independent BBA Certification for waterproofing and methane/radon barrier performance under confining pressure.

For 16.5 hectares, Bentofix® X2 NSP 4900, was used as the low permeability capping system. This GCL with a special polymeric coating installed facing up, was specifically chosen for this application due its heightened performance against desiccation (which enable a smaller soil depth of 450 mm), its protection against ion exchange, its root barrier performance, and its higher gas barrier characteristics. An additional benefit of the polymeric coating is that it is extruded directly onto the GCL and bonds directly to the needle-punched fibres, so there is no risk of the critical polymer layer delaminating. This was an important advantage for the Grimsby site. It offered extra assurance for the environmental protection plan.

The Bentofix® GCL capping work has been fully completed, the country park continues to take shape in Grimsby’s city centre.