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Treatment method for leachate in garbage landfill

A technology for a landfill and a treatment method, which is applied in the field of leachate treatment in a landfill, can solve the problems of air pollution, low removal rate of COD and ammonia nitrogen concentration in the leachate, etc., so as to improve pollution and reduce the amount of leachate water. , the effect of strong anti-shock load capacity

Inactive Publication Date: 2015-02-11
蒋寿悟
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AI Technical Summary

Problems solved by technology

[0003] The recharge method mainly adopts surface spraying. Because it only focuses on evaporation reduction and accelerating the degradation of waste by increasing the humidity in the landfill, not only the removal rate of COD and ammonia nitrogen concentration in the leachate is low, but also the high concentration of leachate raw water Exposure to the ground or air during spraying in large quantities causes stormwater runoff and air pollution

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1, taking the leachate recharge treatment of a landfill as an example, the main treatment facilities are composed of three concrete structures: a sedimentation tank, a waste dump for blind ditch recharging and a garbage dump for spraying and recharging. The volume of the two garbage dumps is 17.3 square meters, the height of the garbage pile is 1 meter, and the landfill age used is more than 5 years old garbage without any pretreatment. After the landfill leachate is removed from the suspended solids by the sedimentation tank, it flows through the blind ditch recharge and spray recharge in turn. During operation, the treatment volume is controlled at 50-200 liters according to the climatic conditions. The operation result shows that the water evaporation loss rate is 30 % or more, the COD concentration removal rate of leachate is 85% to 98%, the ammonia nitrogen concentration removal rate is 82% to 94%, and meets the requirements stipulated in GB14554-93, that is...

Embodiment 2

[0019] Embodiment 2, taking the leachate recharge treatment of a certain landfill as an example, the area of ​​the treatment device is 2.25 square meters, and the height is 1.5 meters. The device is provided with two kinds of recharge water inlet facilities, blind ditch and spraying, and the height of the garbage pile is 1 meter, the landfill age used is more than 5 years old garbage without any pretreatment. After the landfill leachate is settled to remove suspended solids, it is recharged to the blind ditch first, and then the effluent is sprayed and recharged. During operation, the daily treatment capacity is controlled at 7-18 liters according to the climatic conditions, and the operation result is water evaporation loss. The removal rate of COD concentration in leachate is 85% to 95%, the removal rate of ammonia nitrogen concentration is 82% to 92%, and meets the requirements stipulated in GB14554-93, that is, NH 3 3 、H 2 S3 .

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Abstract

The invention discloses a treatment method for leachate in garbage landfill. According to the treatment method, in order to accelerate the stabilization of fresh garbage and simultaneously improve the biodegradability of leachate, the tail water can also be back-filled by virtue of an underdrain or in a spraying and flooding way so as to infiltrate into a fresh garbage landfill heap body and the effluent water is then back-filled by virtue of an underdrain to infiltrate into an old garbage heap body. The leachate raw water is simply precipitated by virtue of a precipitation tank and an underdrain back-filling engineering, the underdrain is formed by embedding pipes of which middles are provided with holes in gravel or sand, each pipe has the diameter of generally 100-200mm and a plurality of holes with aperture of 5-15mm are formed in both sides of each pipe. The pipes are embedded in a way that the holes of the pipes are aligned to the horizontal direction, gravel or sand is arranged at both sides of the pipes and soil-covering layers are arranged at the upper and lower parts of the pipes. According to climatic conditions and the concentration of leachate raw water, the back-filling hydraulic load is controlled, the height of garbage in each garbage landfill heap body is not less than 1m, the thickness of the surface covering soil is not less than 0.5 meter, generally 0.5-0.8 meter, and the cycle frequency or the number of stages in series connection is determined according to the removal rate of leachate contaminants or an evaporation reduction rate.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a treatment method for landfill leachate. Background technique [0002] At present, the disposal of garbage is still dominated by sanitary landfill. The leachate produced in the landfill is a kind of high-concentration, multi-component organic wastewater. The large fluctuation of water quality and quantity is an important feature of it. Therefore, the treatment of leachate has always been a problem. The leachate recharge process not only has a simple treatment process and a good treatment effect, but also can accelerate the stabilization process of the landfill, so that the traditional landfill is regarded as a fully enclosed and isolated system concept, and converted into a bioreactor system The new idea is a conceptual innovation. [0003] The recharge method mainly adopts surface spraying. Since it only focuses on evaporation reduction and accele...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 蒋寿悟
Owner 蒋寿悟
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