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Method and device for treating landfill leachate

A technology for landfill leachate and a treatment method, which is applied in the field of landfill leachate treatment, can solve the problems of low treatment efficiency, long time required, and high leachate cost, and achieves lower COD index, less floor space, and overcoming high investment. Effect

Active Publication Date: 2017-05-31
POWERCHINA ZHONGNAN ENG
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  • Summary
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  • Description
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Problems solved by technology

[0002] According to relevant statistics from the China Urban Construction Research Institute, the average daily output of landfill leachate in my country has reached 120,000 tons, but the amount of further treatment is less than half, and it has a certain ability to treat landfill leachate and the treatment requirements can meet the requirements of relevant water Less than 20% of the landfill sites marked with the pollution discharge concentration limit
[0003] At present, landfill leachate treatment methods mainly include physical and chemical methods and biological methods, but these treatment methods generally have some problems: the land treatment method occupies a large area, takes a long time, and has low treatment efficiency. There are many applications in foreign countries, but it is still in its infancy in China; the use of conventional biological treatment technology is greatly affected by water quality fluctuations, especially for the low treatment capacity of landfill leachate for "middle-aged and elderly" landfills; general physical and chemical methods and conventional methods Although the advanced oxidation method can achieve a high removal rate of COD and ammonia nitrogen, the cost of treating leachate by these methods is too high, and it is not suitable for wide application in practice.

Method used

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  • Method and device for treating landfill leachate
  • Method and device for treating landfill leachate
  • Method and device for treating landfill leachate

Examples

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Effect test

Embodiment 1

[0040] refer to figure 1 , the device includes a regulating tank, a first adsorption filter tank, a hydrothermal treatment unit, a cooling tank, and a second adsorption filter tank connected in sequence. refer to figure 2 , take 50mL of landfill leachate, add 5.0g of powdered activated carbon (particle size 50 mesh) under stirring conditions, and then place it in a constant temperature oscillator and vibrate for 2h under the condition of 200r / min. Take the first adsorbed liquid and put it in a hydrothermal reaction kettle for hydrothermal experiment. The reaction temperature is 150°C and the residence time is 1.5h. Add 2.0 g of powdered activated carbon fiber to the leachate after the hydrothermal reaction under stirring conditions, and then place it in a constant temperature oscillator and vibrate at 200 r / min for 2 h. Filtrate after shaking to obtain purified liquid and activated carbon fiber slag. Some pollution indicators of landfill leachate before treatment and purif...

Embodiment 2

[0046] refer to figure 1 , the device includes a regulating tank, a first adsorption filter tank, a hydrothermal treatment unit, a cooling tank, and a second adsorption filter tank connected in sequence. refer to figure 2 , take 50mL of landfill leachate, add 5.0g of powdered activated carbon (particle size ≤ 60 mesh) under stirring conditions, and then place it in a constant temperature oscillator and shake it at 200r / min for 6h. Take the first adsorbed liquid and put it in a hydrothermal reaction kettle for hydrothermal experiment. The reaction temperature is 200°C and the residence time is 1.5h. Add 2.0 g of powdered activated carbon fiber to the leachate after the hydrothermal reaction under stirring conditions, and then place it in a constant temperature oscillator and vibrate at 200 r / min for 2 h. Filtrate after shaking to obtain purified liquid and activated carbon fiber slag. Some pollution indicators of landfill leachate before treatment and purified liquid are sh...

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Abstract

The invention discloses a treatment method of landfill leachate and a device of the treatment method. The treatment method sequentially comprises the following steps: (1) carrying out first adsorption treatment on the landfill leachate by using active carbon powder to obtain a first post-adsorption liquid; (2) carrying out hydro-thermal treatment on the first post-adsorption liquid in a hydrothermal reaction kettle and cooling the liquid to obtain a hydrothermal post-treatment liquid; and (3) carrying out second adsorption treatment on the hydrothermal post-treatment liquid by using active carbon fibers to obtain a second post-adsorption liquid which can be directly discharged. The treatment device comprises a first adsorption filter tank, a hydrothermal treatment unit, a cooling pool and a second adsorption filter tank which are sequentially connected. The treatment method and device disclosed by the invention combine physical and chemical treatment methods and can economically and efficiently remove various toxic and harmful components in the landfill leachate, so that the landfill leachate is met.

Description

technical field [0001] The invention relates to a treatment method for landfill leachate, which belongs to the field of waste water and sewage treatment. Background technique [0002] According to relevant statistics from the China Urban Construction Research Institute, the average daily output of landfill leachate in my country has reached 120,000 tons, but the amount of further treatment is less than half, and it has a certain ability to treat landfill leachate and the treatment requirements can meet the requirements of relevant water Less than 20% of the landfill sites marked the pollution discharge concentration limit. Landfill leachate has a high pollution load, including a variety of pathogenic microorganisms, carcinogenic organic substances, and heavy metals. If it is discharged without treatment, it will cause great harm to the natural environment and human society. At the same time, landfill leachate is quite difficult to treat due to the characteristics of complex ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 傅利冯云海翟云波尹小伟谭艳忠楚凯锋
Owner POWERCHINA ZHONGNAN ENG
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