Hydraulic conductivity of whole and shredded tyres for use in landfill drainage systems

Hudson, A.P., Beaven, R.P., Powrie, W. and Parkes, D. (2007) Hydraulic conductivity of whole and shredded tyres for use in landfill drainage systems. Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 160 (2), 63-70. (doi:10.1680/warm.2007.160.2.63).

Abstract

Whole or shredded scrap tyres are sometimes proposed as an alternative to conventional aggregates in landfill drainage systems. However, landfill basal drainage systems are subjected to large overburden stresses from the overlying waste, which may compress a tyre drainage layer reducing its porosity and hence its effectiveness. Previous work has indicated that tyre drainage layers will remain effective under high stresses, but tests have in the main been restricted to small (< 100 mm) shred sizes. The use of coarser shreds or even whole tyres for landfill drainage systems may be advantageous as they are more economical to produce and may be less prone to clogging than smaller shreds. In this paper, the results of large scale (2 m diameter) tests to investigate the variation in hydraulic conductivity (permeability) with stress of 50 mm, 200 mm and 450 mm nominal size tyre shreds are compared with data from the literature for smaller size shreds and whole tyres. Tests were carried out at vertical stresses up to 600 kPa, representing landfill depths of up to about 60 metres.

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Contributors

Author: R.P. Beaven

Author: W. Powrie

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