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Treatment technique of garbage filter liquor

A landfill leachate and treatment process technology, which is applied in the field of landfill leachate treatment process, can solve the problems of increased process, investment and operation costs, reverse osmosis membrane is easily affected by temperature, and evaporation technology cannot remove ammonia nitrogen, etc., to achieve the treatment process and effect Stability, reduced evaporation treatment costs, and convenient management

Inactive Publication Date: 2009-12-16
陈伟雄 +1
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In my country, the leachate treatment process that can meet the national standard "Standards for Pollution Control of Domestic Waste Landfill Sites" (GB16889-1997) is the anaerobic + aerobic + membrane treatment process. The main problems of this process are anaerobic and Incoming water COD (chemical oxygen demand) has a large relationship and is unstable. Aerobic treatment can better remove organic matter and have a good nitrification effect, but the denitrification effect is difficult to control, and the effluent nitrate nitrogen (NO3-) is relatively high
Membrane treatment has a good effluent effect, but there are biofilms that are easy to grow on the ultrafiltration membrane, frequent alkali washing, reverse osmosis membranes are easily affected by temperature, and the effluent volume varies greatly. Irrigation is difficult, and the way out has become the most difficult problem to solve. The only way to completely solve the concentrated solution is to burn it. The disadvantage is that the investment of burning is large and the operating cost is high.
[0005] In summary, at present, the only technology that can thoroughly treat landfill leachate is evaporation technology, but a single evaporation technology cannot remove the ammonia nitrogen in the leachate. Various processes for treating landfill leachate in the prior art all increase the process of ammonia nitrogen treatment, Investment, and a lot of operating costs, but it is difficult to adapt to changes in water quality concentration to achieve stable and up-to-standard discharge of effluent

Method used

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  • Treatment technique of garbage filter liquor
  • Treatment technique of garbage filter liquor
  • Treatment technique of garbage filter liquor

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Experimental program
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Embodiment 1

[0027] Embodiment 1 of the present invention is as figure 1 , figure 2 As shown, a treatment process for landfill leachate specifically includes the following steps:

[0028] (1). First, add a coagulant to the landfill leachate. The coagulant can be selected from one of polyaluminum chloride, polyferric chloride or polyferric sulfate, and the fine particles in the leachate can be removed by coagulation and filtration. Fibers, to prevent the tiny fibers from wrapping and changing the heating tube bundle during the evaporation process in the later stage, so as to ensure the efficiency of evaporation and the normal operation of the equipment;

[0029] (2). After filtration to remove fine fibers, the leachate enters the adjustment tank, and the function of the adjustment tank is to control the amount of leachate entering the evaporation system;

[0030] (3). The leachate from the regulating tank enters the evaporation system. After evaporation, water and ammonia are boiled out ...

Embodiment 2

[0034] Embodiment 2 of the present invention is as figure 1 , image 3 As shown, the difference from the previous embodiment is that before the leachate enters the evaporator 1 of the evaporation system, it first exchanges heat with the distilled water, non-condensable gas and concentrated liquid discharged from the evaporation system through a heat exchanger to preheat the leachate . The distilled water pipe 4, the exhaust pipe 5 and the concentrated liquid pipe 8 are respectively connected to the heat exchanger, and the waste heat is transferred to the heat exchanger, and the leachate pipe 9 is also connected to the heat exchanger, so as to make full use of the waste heat of the above three discharges, Therefore, the temperature of the landfill leachate that needs to be treated is close to the boiling point before entering the evaporator 1, which improves the utilization efficiency of electric energy and achieves the purpose of further saving energy. The hot well 6 of the ...

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Abstract

A garbage leachate treatment process includes specifically the following steps. Firstly, coagulant is added in garbage leachate and fine fibers in the leachate are removed through the coagulation and the filtration. Secondly, the filtered leachate enters a regulation tank. Thirdly, the leachate coming out of the regulation tank enters an evaporation system. Water and ammonia boils out from the leachate through the evaporation and becomes into steam, which changes into distilled water after the condensation. The distilled water is discharged and enters an ion exchange resin system. The ion exchange reaction happens when the distilled water passes through resins, and the ammonium is removed. The distilled water is discharged when the ammonium and nitrogen indexes reach to the standard. Incondensable air in the steam and a little steam which does not condensate are discharged out of the evaporation system into an absorption tower. Fourthly, the leachate coming out of the regulation tank enters the evaporation system. The reminders of the leachate after the evaporation are pollutants which can not be changed into air to be discharged out of the evaporation system and are condensed into concentration solution, which is then discharged out of the evaporation system and can be recycled into a landfill. The process has the advantages of thorough treatment and low operation cost.

Description

Technical field [0001] The invention relates to a process for treating landfill leachate, in particular to a process for treating landfill leachate with high efficiency, stability, thorough treatment and low operation cost. Background technique [0002] With the increase of urban population, the expansion of urban scale and the improvement of residents' living standards, the output of domestic waste is increasing sharply. As a kind of urban fixed waste disposal method, landfill is widely used at home and abroad. In my country, currently 93% The left and right urban solid wastes are landfilled. In the process of urban waste landfill, due to the compaction and the biochemical action of microorganisms, the pollutants contained in the waste will be dissolved with water, and form landfill leachate together with rainfall. However, a small amount of landfill leachate can cause serious pollution to groundwater, surface water and the surrounding environment of landfills, resulting in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/04C02F1/52C02F1/42
Inventor 陈伟雄谭润宇原效凯廖治平王彩虹
Owner 陈伟雄