Abstract
2 Abstract: Sanitary l andfilling i s the most common w ay t o el iminate solid ur ban wastes. An i mportant problem associated to landfills is the production of lea chates. T his p aper is a review of lan dfill leachate treatments. The advantages and disadvantages of the va rious existing leachate t reatments discussed unde r the items: (1)Leachate Channeling (Combined Treatment with domestic sewage, Recycling). (2)Biological Processing (Aerobic and Anaerobic). (3)Chemical/Physical Treatment (Flotation, Coagulation/Flaoculation, Chemical Precipitation, , Adsorption, Ammonium stripping, Chemical Oxidation, Ion exc hange and Electrochemical treatment). (4) Membrane filtration ( Microfiltration, Ultrafiltration, Nanofiltration and Reverse osmosis). T he major fra ction of o ld or b iologically treated leachate is large recalcitrant o rganic molecules th at are not ea sy removed during biological t reatment. So that, in order t o meet s trict q uality standards for direct discharge of leachate i nto t he s urface water, a d evelopment of integrated met hods of treatment, i.e. a c ombination of biological, chemical, physical and membrane process steps, are r equired. Today, the us e of membrane technologies, more e specially R everse O smosis (RO), either as a mai n s tep in a landfill leachate treatment ch ain or a s s ingle post-treatment s tep has s hown to be an indispensable means of achieving pur ification.
Highlights
Landfilling of municipal waste is still a very important issue of the waste management system in the world
Wastes cause two types of pollution, which correspond to the migration into the natural environment of:- [1]leachates, defined as water that has percolated through the wastes, a source of soil and groundwater contamination and[2]biogas produced by the fermentation of organic matter, a source of air pollution
Moving-Bed Biofilm Reactor (MBBR)- process is based on the use of suspended porous polymeric carriers, kept in continuous movement in the aeration tank, while the active biomass grows as a biofilm on the surfaces of them
Summary
Landfilling of municipal waste is still a very important issue of the waste management system in the world. Moving-Bed Biofilm Reactor (MBBR)- process is based on the use of suspended porous polymeric carriers, kept in continuous movement in the aeration tank, while the active biomass grows as a biofilm on the surfaces of them Mains advantages of this method compared to conventional suspended growth processes seems to be: higher biomass concentrations, no long sludge-settling periods, lower sensitivity to toxic compounds[46] and both organic and high ammonia removals in a single process[22]. Coagulation-flocculation: Coagulation-flocculation may be used successfully in treating stabilized and old landfill leachates[63] It is widely used as a pretreatment[4,78], prior to biological or reverse osmosis step, or as a final polishing treatment step in order to remove non-biodegradable organic matter. If this method is to be efficient, high pH values must be used and the contaminated gas phase must be treated with either
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