Method for pre-treating landfill leachate by coagulation-ozonation

A technology of landfill leachate and ozone oxidation, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high power consumption, poor operation effect and high cost. , to achieve the effect of fast settling speed and large floc particle size

Inactive Publication Date: 2015-01-28
XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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  • Description
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  • Application Information

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Problems solved by technology

Chemical oxidation (including ozone and hydrogen peroxide) is used for the advanced treatment of landfill leachate. The reason is that in many cases, complex and refractory organic matter can be directly oxidized into simple and easily degradable organic matter. The internal free radical reaction It can accelerate the oxidation rate. There are currently about 100 landfill leachate treatment plants in Germany, 15 of which use chemical oxidation as an advanced treatment process. However, chemical oxidation treatment of landfill leachate in foreign countries is basically in the experimental stage. The disadvantages are High power consumption and high cost
Most of the leachate treatment processes in existing urban waste landfills in my country use anaerobic plus aerobic biological treatment methods, and there are generally problems with poor operating results

Method used

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  • Method for pre-treating landfill leachate by coagulation-ozonation

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Experimental program
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Effect test

Embodiment 1

[0015] After roughly filtering the landfill leachate, adjust the pH value to 7-8, and add polysilicate aluminum sulfate coagulant (silicon, aluminum, iron, etc.) The content ratio is 2:1:1) for 10-20 minutes, after 40-60 minutes of precipitation, the supernatant is passed through the ozone oxidation tank for ozone oxidation treatment with an ozone concentration of 6g / L for 10 minutes, and the effluent is pretreated wastewater, which is introduced into the subsequent in the anaerobic-aerobic biological treatment process.

Embodiment 2

[0016] Embodiment two: processing effect

[0017] Using the pretreatment method described in the present invention, a certain landfill leachate is pretreated, and the pretreatment effect is as shown in Table-1:

[0018] Table-1 Treatment effect

[0019]

[0020] As can be seen from Table-1, the pretreatment method of the present invention has a removal rate of more than 70.6% to COD of landfill leachate, a removal rate of BOD5 of more than 75.4%, and a chroma removal rate of more than 94%. After pretreatment The COD, BOD, and chroma of the wastewater are greatly removed, creating favorable conditions for subsequent treatment.

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Abstract

The invention relates to a method for pre-treating landfill leachate by coagulation-ozonation and belongs to the field of methods for wastewater treatment. The method for pre-treating landfill leachate by coagulation-ozonation comprises the following steps: after coarsely stirring the landfill leachate, adjusting the pH value to 7-8; adding a flocculant into a coagulative precipitation tank to treat in the stirring state; after settling, carrying out ozonation treatment on supernate in an ozonation pond, wherein effluent is pre-treated wastewater; and introducing the wastewater in a subsequent anaerobic-aerobic biological treatment process. According to the method for pre-treating landfill leachate by coagulation-ozonation provided by the invention, under the optimal treatment condition, the removal rate of COD (Chemical Oxygen Demand) of the landfill leachate reaches 70.6%, the BOD5 (Biochemical Oxygen Demand) removal rate reaches 75.4% and the chroma removing rate reaches 94%. The water quality has already been close to secondary standard of pollution control of municipal solid waste landfill of China so as to supply favorable conditions for a subsequent treatment process, thus the pre-treatment process is feasible.

Description

technical field [0001] The invention relates to a coagulation-ozone oxidation pretreatment method for landfill leachate, belonging to the field of wastewater treatment methods. Background technique [0002] Landfill leachate is the flow product of liquid under the action of gravity in the landfill site. It mainly comes from precipitation and the water contained in the garbage itself. Due to the physical, chemical and biological factors in the process of liquid flow, the leachate may be affected. Water quality, so its properties vary within a larger range. Generally speaking, the pH value of leachate is between 4-9, COD can range from several thousand to tens of thousands, and BOD5 can range from tens to tens of thousands. [0003] Landfill leachate has deep color, high content of organic matter, NH3-N, SS, and chloride, and there are many types and large numbers of harmful microorganisms. With the increase of stacking years, fresh garbage gradually becomes stale garbage, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 陆强
Owner XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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