Review on Landfill Leachate Treatments

Abstract

Problem Statement: Sanitary landfilling is the most common way to eliminate solid urban wastes. An important problem associated to landfills is the production of leachates. This study is a review of landfill leachate treatments. Approach: The advantages and disadvantages of the various existing leachate treatments discussed under the items: (i) Leachate channeling (combined treatment with domestic sewage, recycling) (ii) Biological processing (aerobic and anaerobic) (iii) Chemical/physical treatment (flotation, coagulation/flocculation, chemical precipitation, adsorption, ammonium stripping, chemical oxidation, ion exchange and electrochemical treatment) (iv) Membrane filtration (microfiltration, ultrafiltration, nanofiltration and reverse osmosis). Conclusion: The major fraction of old or biologically treated leachate was large recalcitrant organic molecules that are not easy removed during biological treatment. So that, in order to meet strict quality standards for direct discharge of leachate into the surface water, a development of integrated methods of treatment, a combination of biological, chemical, physical and membrane process steps, were required. 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 had shown to be an indispensable means of achieving purification.

Landfill Leachate Nutrient Removal Using Intermittent Aeration

“…However, most common problems in biological treatment of semi-mature and mature landfill leachates are mainly the high COD and ammonium content, the presence of heavy metals and the low BOD/COD ratio (Park et al 2001). Therefore, the combination of both chemical and biological methods in most cases results in the satisfactory and efficient treatment of such hazardous effluents (Abbas et al 2009). Aerobic, anaerobic and anoxic processes are among the biological treatment methods used (Im et al 2001) in order to remove carbonaceous compounds as well as nutrients like nitrogen and phosphorus, minimizing at the same time the cost of secondary treatment.…”

Tratamento conjugado de lixiviado de aterro sanitário e esgoto doméstico em lagoas de estabilização

“…Segundo Abbas et al (2009), a quantidade de lixiviado gerado em um aterro sanitário depende da percolação das águas de chuvas pelas camadas dos resíduos aterrados, dos processos bioquími-cos que ocorrem na fração da massa putrescível, do percentual de água presente na massa dos resíduos e também do grau de compactação dos resíduos aterrados. Guo et al (2010) constataram que as caracterís-ticas qualitativas do lixiviado de aterros sanitá-rios variam de acordo com o tipo, grau e estágio de decomposição dos resíduos sólidos aterrados, como também da umidade, variações sazonais do tempo e idade do aterro.…”

Control Mechanism of Bad Odor Generated from Sanitary Landfill Leachate Using Swiss Pharm BioMist

“…As a result, the high concentrations of these parameters indicate that the leachate is highly polluted and emit odorant gases to the surrounding environment. The leachate odorous smell may be due mainly to the presence of organic acids, which come from the high concentration of organic matter (OM) when decomposed [11]. After addition of BioMist, the Physico-chemical characteristics of leachate decrease in all concentration of BioMist.…”