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Infiltration liquid treatment method in domestic refuse burying field

A technology of municipal solid waste and treatment method, applied in the field of leachate treatment of municipal solid waste landfills, can solve the problems of high retention rate, high cost and high concentration, and achieve the effects of no secondary pollution, reliable operation and advanced technology.

Inactive Publication Date: 2005-09-21
TSINGHUA UNIV
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Problems solved by technology

Because reverse osmosis and nanofiltration generally have a high rejection rate for various components in the leachate, including organic matter and inorganic salts, and their selectivity is poor, especially reverse osmosis, which is almost indiscriminately intercepted. Therefore, the concentrate The composition is complex and the concentration is high. At present, its treatment methods mainly include recharge, incineration, solidification, etc. Among them, the cost of incineration and solidification is high, while the cost of recharge is relatively low, but it will lead to salt in the leachate of the landfill after recharge. Accumulation of ions, which will affect the normal operation of the membrane process
To sum up, there are certain problems and shortcomings when considering leachate simply from the perspective of treatment.

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  • Infiltration liquid treatment method in domestic refuse burying field
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Embodiment Construction

[0017] Combine figure 1 Take the treatment of leachate from a sanitary landfill of municipal solid waste in Beijing as an example to illustrate the present invention.

[0018] The sanitary landfill started operation in 1997 and has now entered the stage of methane production. It produces 200 tons of leachate per day. The water quality is as follows: pH 7.67~8.48, COD cr 2220~3520mg / L, BOD 5 230~617mg / L, TOC 841~1590mg / L, NH 4 -N is 748~1460mg / L, the conductivity is 18.2~24.1ms / cm, the concentration of heavy metals is lower than the first level emission standard, and the color is yellow to reddish brown. It can be seen that the leachate has been fully anaerobic decomposed in the landfill, and the ammonia nitrogen concentration is less than 1500mg / L. Pump the leachate into a sand filter tank and a small microfiltration device to remove particles such as sludge with a particle size greater than 1-10μm. The effluent is then pumped into the ultrafiltration system. The relative molecul...

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Abstract

The invention discloses a method for processing the leachate liquid of the landfill field of municipal refuse, which belongs to environmental protection technical field and comprises the following steps: pumping the leachate liquid into an ultrafiltration system, and the condensation liquid from barrier separation can be used for separating producing the humic acid organic liquid fertilizer, making the penetrant liquid enter a biological film nitrating and denitrifying system to remove nitrogen and organic matter. The said biological film nitrating and denitrifying system is made up of a composite anaerobic organism reactor and a two-stage aerobic organism reactor. The outlet water from the said biological film nitrating and denitrifying system enters a coagulating sedimentation tank to purify the biological film and macromolecule water-soluble organic molecule from the said biological film nitrating and denitrifying system.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a method for treating leachate in a municipal solid waste landfill. Background technique [0002] Sanitary landfill has always been one of the main methods of municipal solid waste disposal due to its low economy and reliable technology. In the daily operation and management of landfills, the treatment of leachate is still a problem, and it has become the mainstay of municipal solid waste landfills. Source of secondary pollution. The essential reason that the leachate is difficult to handle is that the leachate contains high concentrations of refractory organics-humic acid and ammonia nitrogen. The former is actually more difficult to solve, because many studies and engineering practices have shown that as long as the reactor is selected reasonably or the process parameters are optimized , Even if the ammonia nitrogen concentration is as high as 1500mg / L, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCY02E50/343Y02E50/30
Inventor 聂永丰许玉东岳东北
Owner TSINGHUA UNIV
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