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Leachate and concentrated solution treatment method for refuse landfill

A landfill and leachate technology, applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problem that the biochemical treatment process cannot run continuously, and achieve a small footprint, High water yield and the effect of preventing organic matter load

Inactive Publication Date: 2013-03-27
朗照技术(北京)有限公司
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Problems solved by technology

After treatment, no concentrated liquid will be produced, and the concentrated liquid produced by other processes can be treated at the same time; no nutrients are added, which prevents the phenomenon of artificially increasing the load of organic matter; it can be started and stopped at any time, which overcomes the biochemical treatment in the leachate treatment process of small garbage treatment facilities Disadvantages of the process not being able to run continuously

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  • Leachate and concentrated solution treatment method for refuse landfill

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Embodiment

[0033] The leachate stock solution of the landfill site is treated with the method of the present invention, and the leachate stock solution contains a COD concentration of 10616 mg / L and an ammonia nitrogen concentration of 2204 mg / L.

[0034] (1) The leachate is coagulated and precipitated. The coagulant is added with PAC at a dosage of 1g / L, and the coagulant aid is PAM with a dosage of 4mg / L. After coagulation and sedimentation, the effluent COD reaches 7400mg / L, ammonia nitrogen reaches 1665mg / L, therefore, the COD removal rate is 30.3%. The removal rate of ammonia nitrogen is 24.5%.

[0035] (2) After the effluent is centrifuged, it enters the evaporator to evaporate, the evaporating water yield is 90%, the effluent COD reaches 308mg / L, and the ammonia nitrogen reaches 1160mg / L, therefore, the COD removal rate is 95.8%. The removal rate of ammonia nitrogen is 30.3%.

[0036] (3) The evaporated supernatant enters the electrolyzer for electrolysis, the voltage of the fir...

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Abstract

A leachate and concentrated solution treatment method for a refuse landfill is disclosed, and belongs to the technical field of leachate treatment. The method comprises the steps of: lifting the leachate from an adjusting pool to a hydrocyclone, wherein the effluent enters into a coagulative precipitation tank; adding a coagulant, wherein the effluent enters into a centrifugal dehydrator to separate the solid and liquid, and the solid enters into the refuse landfill to bury and the liquid enters into an evaporator; evaporating the liquid in the evaporator, and desiccating the concentrated solution by a drier, wherein the solid enters into the refuse landfill to bury, and the condensate and condensate clear liquid from the evaporator in the desiccating process enter into an electrolytic device; and after the effluent of the electrolytic device enters into the reaction pool, adding hydrogen peroxide into the reaction pool to meet the standard to discharge. The electrolytic device is a device consisting of electrolytic cells, uses a titanium net plated by ruthenium as the positive electrode and a titanium net or a stainless steel net plated by ruthenium as the negative electrode and takes a pulse direct current power supply as a work power supply for electrolysis at constant voltage. The voltage increases orderly in a range from 2v to 10v. The current density increases orderly in a range from 60mA / sq.cm to 470 mA / sq.cm. With adoption of the invention, no concentrated solution is generated and the effluent yield is high.

Description

technical field [0001] The invention relates to a method for treating leachate and concentrated liquid of landfill, belongs to the technical field of leachate treatment, is suitable for treating leachate produced by landfill, and is especially suitable for treating leachate produced by other leachate treatment processes Concentrate, or as a pretreatment method for other processes. Background technique [0002] At present, the commonly used landfill leachate treatment process is biochemical treatment + membrane treatment process. The ammonia nitrogen in the leachate is removed through the nitrification and denitrification process to reduce the COD content, and most of the COD is removed by nanofiltration or reverse osmosis. This process produces about 20% of the concentrated liquid. When the method of recharging the landfill pile is used to treat the leachate concentrated liquid, the salt content of the leachate will increase continuously, and the water yield will decrease; d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/56C02F1/04C02F1/461C02F1/72C02F1/38
Inventor 秦侠其他发明人请求不公开姓名
Owner 朗照技术(北京)有限公司
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