Better cover-ups

Article Abstract:

Engineers would do well to revise their approach to designing covers for sanitary landfills, taking into account environmental factors. Research findings suggest that they make a temporary cover first, wait until the waste has substantially decomposed, and only then make the final cover. They must give special attention to barrier layers, the most critical of the usual five cover layers. Compacted clay liners, prone to dessication and cracking, have proved inefficient barriers, technically and economically. On the other hand, geomembranes and geosynthetic clay liners have better cost-benefit ratios.

Research, Evaluation, Environmental aspects, Waste disposal in the ground, Underground waste disposal, Geomembranes

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Capping with fiber clay

Article Abstract:

Fiber clay, a collection of paper-mill waste, is found to be very good material for landfills' barrier-layer cap. This produces environmental benefits and is also very economical. This material is very easy to handle and moisture-control is not needed for the process. It composed of organic wood-fibres, grit and clay obtained from paper coatings and is a bi-product of paper manufacturing. There is a physical similarity between organic soil and the solid and organic content of the fiber clay.

Maintenance and repair, Waste products

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The evolution of geosynthetics

Article Abstract:

Geosynthetic materials have undergone considerable changes since these were first used by prehistoric man to stabilize swamplands and soils. Today, geosynthetics are used by engineers for functions such as separation, reinforcement, filtration and drainage. Types of geosynthetic materials include geotextiles, geogrids, geonets and geomembranes. The future applications of geosynthetics are discussed.

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