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Abstract
In most countries, sanitary landfilling is nowadays the most common way to eliminate
municipal solid wastes (MSW). In spite of many advantages, generation of heavily polluted
leachates, presenting significant variations in both volumetric flow and chemical
composition, constitutes a major drawback. Year after year, the recognition of landfill
leachate impact on environment has forced authorities to fix more and more stringent
requirements for pollution control. This paper is a review of landfill leachate treatments.
After the state of art, a discussion put in light an opportunity and some results
of the treatment process performances are given. Advantages and drawbacks of the various
treatments are discussed under the items: (a) leachate transfer, (b) biodegradation,
(c) chemical and physical methods and (d) membrane processes. Several tables permit
to review and summarize each treatment efficiency depending on operating conditions.
Finally, considering the hardening of the standards of rejection, conventional landfill
leachate treatment plants appear under-dimensioned or do not allow to reach the specifications
required by the legislator. So that, new technologies or conventional ones improvements
have been developed and tried to be financially attractive. Today, the use of membrane
technologies, more especially reverse osmosis (RO), either as a main step in a landfill
leachate treatment chain or as single post-treatment step has shown to be an indispensable
means of achieving purification.