Landfill Drainage

Basal Drainage, Pozidrain Protector, Lean Quarry Landfill, UK

Project Information

Client:Viridor Waste Management
Contractor:Moulding Contracts
Consultant:SLR Consulting
Product:Pozidrain Protector 745
Quantity10,000m2
Benefits:- Excellent geomembrane protection at 1,200kPa loading
- High flow capacity in both directions
- Replaced 5,000m3 drainage stone
- Rapid installation on steep slopes


Project Description

Lean Quarry landfill site near Liskeard is an important facility for the residential and commercial waste disposal requirements in Cornwall. It is located in an environmentally sensitive area and therefore subject to close Environment Agency supervision. The site also accepts waste from Devon and this volume of waste meant that additional capacity was required. Viridor Waste Management Ltd approached SLR Consulting to design a new cell for this landfill site.

The Challenge

A new 45m deep landfill cell was required to be developed at Lean Quarry landfill site using adequate cost effective geosynthetic materials for this deep application.

The requirement was to design a geosynthetic lining solution that would comprise of a double lining system (GCL and HDPE membranes), geocomposite drainage/protection layer on steep 1 in 2.5 basal side slopes and drainage stone on the cell base (10/20mm layer below the 20/40mm granite).

The geocomposite drainage/protection layer would be exposed to sunlight for several months until the waste was placed, so must be highly UV stable. In addition, to demonstrate adequate protection of the geomembrane, the geocomposite would need to pass a cylinder test to Environment Agency standards. Furthermore, the geocomposite must resist long term compressive creep under the pressure of 45m of waste.

The Solution

The designer SLR Consulting worked with ABG to develop a geosynthetic drainage and protection solution that would provide the required puncture resistance and flow capacity to ensure effective geomembrane protection and leachate drainage. 

ABG’s Pozidrain Protector 745 geocomposite drainage layer with enhanced protection and UV resistance was specified and installed on top of the 2mm HDPE textured geomembrane on steep side slopes. SIM tests confirmed that the compressive creep was less than 20% in 120 years. Environment Agency cylinder test results for the Pozidrain Protector and stone material from this site indicated sufficient puncture resistance and protection performance to achieve the required factor of safety for the 45m deep installation and 1,200kPa pressure (2.5 times service loading).

ABG Pozidrain Protector Drainage Geocomposite and basal protection for landfill applications

ABG Pozidrain Protector

The ABG Service

ABG provided technical advice and design assistance. This included cylinder testing and flow capacity calculations.

Contact ABG today to discuss your project specific requirements and discover how ABG past experience and innovative products can help on your project.

 Double lining system installation GCL and 2mm textured HDPE geomembranes Double lining system installation GCL and 2mm textured HDPE geomembranes
Pozidrain Protector for Basal drainage and geomembrane protectionPozidrain Protector puncture resistance ensured adequate geomembrane protection at 45m depth
UV resistant Pozidrain geotextile welding with a hot air gunUV resistant Pozidrain geotextile welding with a hot air gun
Slope and basal drainage protectionSlope and basal drainage protection


Pozidrain Protector

Pozidrain Protector is developed specifically for use in landfill basal lining systems to collect and drain leachate whilst providing protection to the geomembrane lining systems.

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Pozidrain Protector
 

Products

Pozidrain Protector

Pozidrain Protector is developed specifically for use in landfill basal lining systems to collect and drain leachate whilst providing protection to the geomembrane lining systems.

more...

Pozidrain Protector
 

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