Vacuum low-temperature evaporation concentration treatment method of landfill leachate

A technology of landfill leachate and vacuum evaporation, which is applied in chemical instruments and methods, heating water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as high operating costs, high cleaning frequency, and easy corrosion and scaling. Achieve the effect of reduced process energy consumption, increased evaporation rate, and improved scaling and corrosion problems

Active Publication Date: 2016-08-24
CHINA GDE ENG
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a vacuum low-temperature evaporation and concentration treatment method for landfill leachate, which overcomes the shortcomings of existing leachate evaporation equipment, such as easy corrosion and scaling, high cleaning frequency, high operating costs, and high energy consumption. , and compared with the traditional biological treatment process, the present invention can not only improve the removal efficiency of pollutants (especially ammonia nitrogen and total nitrogen), reduce the secondary pollution of the concentrate, but also reduce operating costs and investment costs

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  • Vacuum low-temperature evaporation concentration treatment method of landfill leachate

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Embodiment

[0028] The device of this embodiment is as figure 1 As shown, the implementation steps are as follows:

[0029] (1) Garbage leachate selectively enters the pretreatment mechanism 12 according to the water quality of the influent, such as including primary sedimentation tank (for sedimentation), adjustment tank (for homogenization (stirring evenly) and equalization (controlling water output), filter ( Filtration), pH adjustment, etc., the pH adjustment is to add nitric acid to a pH of about 5. Then the pretreated raw water is heated by the first heater 4 .

[0030] (2) Operate the vacuum compressor 2 to pump the evaporator 1 to a vacuum state, control the operating pressure of the evaporator 1 at 4.5-7.5kPa, and control the evaporation temperature at 35±5°C. The pretreated leachate is sent to the feed port 6 of the evaporator 1 under pressure, and is treated and separated into steam and concentrated liquid by the evaporator 1 .

[0031] (3) After being separated by steam-wate...

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Abstract

The invention discloses a vacuum low-temperature evaporation concentration treatment method for landfill leachate, which is characterized in that: the landfill leachate is separated into steam and concentrated liquid by low-temperature evaporation in a vacuum state through a vacuum evaporator, and the operating pressure of the vacuum evaporator is controlled at 4.5‑7.5kPa, the evaporation temperature is controlled at 30‑40°C. Because the invention adopts low-temperature evaporation, it reduces fouling of the evaporator and facilitates cleaning, prevents ammonia nitrogen from overflowing with steam, improves heat exchange efficiency, reduces heat loss, has low energy consumption, and low leachate treatment cost.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a method for treating garbage leachate by vacuum low-temperature evaporation and concentration. Background technique [0002] Municipal solid waste treatment mainly includes technologies such as incineration, landfill and composting. Due to the advantages of low cost and simple technology, landfill technology is currently one of the most widely used treatment methods; waste incineration technology has been gradually It has become one of the main disposal methods of domestic waste. However, both treatment methods will produce a large amount of leachate. Moreover, landfill leachate has the characteristics of complex and variable water quality and quantity, high pollutant concentration and refractory degradation, making its treatment one of the most difficult problems in urban domestic waste treatment. [0003] Conventional leachate treatment methods mainly include physical and c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/04C02F9/10
Inventor 何伟才刘扬徐明忠林强
Owner CHINA GDE ENG
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