solid waste disposal and landfilling will continue to be the primary means of Industrial solid waste leachate (50 to g/ℓ TDS) cannot be. Leachate is the liquid that drains or 'leaches' from a landfill. It varies widely in composition regarding the age of the landfill and the type of waste that it contains. Landfilling has been relegated to containing waste and hoping for minimal environmental impact. However, landfills produce harmful leachate and landfill gas.


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Landfill leachate[ edit ] Leachate from a landfill varies widely in composition depending on the age of the landfill and the type of waste that it contains.

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The generation of leachate is caused principally by precipitation percolating through waste deposited in a landfill. Once in contact with decomposing solid waste, the percolating water becomes contaminated, and if it then flows out of the waste material it is termed leachate.

The risks of leachate generation can be mitigated by properly designed and engineered landfill sites, such landfilling of waste leachate those that are constructed on geologically impermeable materials or sites that use impermeable liners made of geomembranes or engineered clay.

The use of linings is now mandatory within the United StatesAustralia and the European Union except where the waste is deemed inert.

In addition, most toxic and difficult landfilling of waste leachate are now specifically excluded from landfilling.


However, despite much stricter statutory controls, leachates from modern landfilling of waste leachate are often found to contain a range of contaminants stemming from illegal activity or legally discarded household and domestic products.

Composition of landfill leachate[ edit ] When water percolates through waste, it promotes and assists the process of decomposition by bacteria and fungi.


These processes in turn release by-products of decomposition and rapidly use up any available oxygen, creating an anoxic environment. In actively decomposing waste, the temperature rises and the landfilling of waste leachate falls rapidly with the result that many metal ions that are relatively insoluble at neutral pH become dissolved in the developing leachate.

Landfilling of Waste: Leachate - CRC Press Book

The landfilling of waste leachate processes themselves release more water, which adds to the volume of leachate. Leachate also reacts with materials that are not prone to decomposition themselves, such as fire ash, cement -based building materials and gypsum-based materials landfilling of waste leachate the chemical composition.

In sites with large volumes of building waste, especially those containing gypsum plaster, the reaction of leachate with the gypsum can generate large volumes of hydrogen sulfidewhich may be released in the leachate and may also form a large component of the landfill gas.

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In a landfill that receives a mixture of municipal, commercial, and mixed industrial waste but excludes significant amounts of concentrated chemical waste, landfill leachate may be characterized as a water-based solution of four groups of contaminants: The smell is acidic and offensive and may landfilling of waste leachate very pervasive because of hydrogen- nitrogen- and sulfur-rich organic species such as mercaptans.

Leachate management[ edit landfilling of waste leachate In older landfills and those with no membrane between the waste and the underlying geology, leachate is free to leave the waste and flow directly into the groundwater.

In such cases, high concentrations of leachate are often found in nearby springs and flushes.

Landfilling of Waste: Leachate

As leachate first emerges it can be black in colour, anoxic, and possibly effervescentwith dissolved and entrained gases. As it becomes oxygenated it tends to turn brown or yellow because of the presence of iron salts in solution and in suspension.

It also quickly develops a bacterial flora often comprising substantial growths of Sphaerotilus landfilling of waste leachate.

History of landfill leachate collection[ edit ] In the UK, in the late s, central Government policy was to ensure new landfill sites were being chosen with permeable underlying geological strata to avoid the build-up of leachate.

This policy was landfilling of waste leachate "dilute and disperse".

However, following a number of cases where this policy was seen to be failing, and an exposee in The Sunday Times of serious environmental damage being caused by inappropriate disposal of industrial wastes, both policy and the law were changed.

The Deposit of Poisonous Wastes Act[5] together with The Local Government Act, made local government responsible for waste disposal and for the enforcement of environmental standards landfilling of waste leachate waste disposal.

Landfilling of Waste: Leachate - Google книги

Proposed landfill locations also had to be justified not only by geography but also scientifically. Many European countries decided to landfilling of waste leachate landfill sites in groundwater-free clay geological conditions or to require that the site have an engineered lining.

In the wake of European advancements, the United States increased its development of leachate retaining and collection systems. This quickly led from lining in principle to the use of multiple lining layers in all landfills excepting those truly inert.