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In-situ denitrification method of percolate of domestic refuse landfill

A technology for landfill leachate and domestic waste, applied in chemical instruments and methods, contaminated groundwater/leachate treatment, sustainable biological treatment, etc. The effect of demand, volume reduction, and carbon saving

Inactive Publication Date: 2010-06-02
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an in-situ denitrification method for the leachate of domestic garbage landfill, which can solve the pollution problem of high concentration ammonia nitrogen and organic matter in the leachate

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  • In-situ denitrification method of percolate of domestic refuse landfill

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Embodiment

[0019] Taking the landfill leachate as the research object, the leachate stock solution collected from the storage tank and transported to the aerobic nitrification tank has a COD of 2000-4000mg / L and an ammonia nitrogen concentration of 1000-2000mg / L. The water flow is 1m 3 / d, the amount of inoculated sludge in the aerobic nitrification tank is 4000-5000mg / L, start the aeration system, control the dissolved oxygen at 2.0-3.0mg / L, adjust the alkalinity pH at 7.5-8.5, and measure the aerobic nitrification tank Medium ammonia nitrogen concentration, when the ammonia nitrogen concentration drops below 25mg / L, it is discharged to the sedimentation tank for mud-water separation, and part of the sludge is returned to the aerobic nitrification tank. The sludge reflux ratio is 50-100%, and the remaining part is discharged. liquid into the dosing pool, according to COD / NOx - -N=1.5-2.6 Add carbon source, stir and mix evenly; send the mixed solution output from the dosing tank into th...

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Abstract

The invention discloses an in-situ denitrification method of percolate of a domestic refuse landfill, comprising the following steps of: conveying stock solution of refuse percolate collected by a regulating and storing tank into an aerobic nitration tank, adjusting the aeration rate and the alkalinity of the aerobic nitration tank, controlling the dissolved oxygen at 2.0-3.0mg / L and the pH value at 7.5-8.5 and yielding water when the ammonian concentration of percolate in the aerobic nitration tank is lower than 25mg / L; inputting the yielding water of the aerobic nitration tank to a sedimentation tank for sludge-water separation, refluxing a sludge part to the aerobic nitration tank and discharging the rest part; and feeding supernatant into a medicine application tank, adding a carbon source according to the relationship formula that COD / NOx is equal to 1.5-2.6, evenly stirring and inputting the mixture to a denitrifying reaction vessel of a refuge landfill body so as to convert nitrite and nitrate into nitrogen gas by denitrifying microorganism in the refuge landfill body. The invention combines an activated sludge method and a percolate landfill body recharging technology to realize high-efficiency denitrification of the percolate and simultaneously remove organic contaminants with high concentration and has low operation cost.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a combined process of aerobic nitrification outside the garbage dump of leachate from a domestic garbage landfill-anaerobic denitrification inside the garbage dump-ozone oxidation-deep treatment of soil vegetation layers. Background technique [0002] As a final treatment and disposal method, sanitary landfill has been widely used due to its simple process, low investment, large processing capacity and low operating cost. It is currently one of the most commonly used methods for the harmless treatment and disposal of municipal solid waste at home and abroad one. However, this technology has increasingly exposed its limitations. One of the most prominent problems is the large amount of refractory leachate with complex components and variable properties containing high concentrations of organic matter and ammonia nitrogen produced during the landfill process. In terms o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/12C02F3/28C02F103/06
CPCY02W10/10
Inventor 吴伟祥孙法迁吴松维陈英旭
Owner ZHEJIANG UNIV
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