Method and device for treating landfill leachate thick water

A landfill leachate and treatment method technology, which is applied in the field of landfill leachate treatment, can solve the problems of reducing the service life of the membrane, affecting the membrane flux, and increasing the salt content of wastewater, so as to improve the service life, reasonable process technology, and smooth operation Effect

Inactive Publication Date: 2012-02-01
北京洁绿环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After actual verification, although this has not caused adverse effects on the previous biochemical system, there is always a part of the water circulating in the treatment system, and the refractory organic matter and the salt in the sewage circulate in the treatment system. Continuously accumulating concerns increase the salt content of wastewater in the treatment system
High salt content will reduce the activity of microorganisms and affect the effect of

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

Examples

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Effect test

Embodiment 1

[0052] Embodiment 1, processing the concentrated water produced in the landfill leachate treatment process

[0053] The concentrated water produced in the landfill leachate treatment to be treated in this embodiment is the comprehensive concentrated water that is passed into the concentrated water storage tank respectively from the concentrated water generated in the treatment process of the landfill leachate nanofiltration membrane and the reverse osmosis membrane. The water quality is as follows: COD cr It is 3272mg / L, BOD 5 It is 320mg / L, the chromaticity is 500 times, and the pH value is 6.5.

[0054] This embodiment is carried out in the actual leachate treatment project: the Fenton's reagent used is made of H 2 o 2 and FeSO 4 ·7H 2 Composition of O, H 2 o 2 and FeSO 4 ·7H 2 The molar ratio of O is 3:1.

[0055] Pump out the above-mentioned concentrated water from the concentrated water storage tank at a rate of 625L per hour, pass hydrochloric acid into the pip...

Embodiment 2

[0057] Embodiment 2, processing the concentrated water produced in the landfill leachate treatment process

[0058] The concentrated water produced in the landfill leachate treatment to be treated in this embodiment is the comprehensive concentrated water that is passed into the concentrated water storage tank respectively from the concentrated water generated in the treatment process of the landfill leachate nanofiltration membrane and the reverse osmosis membrane. The water quality is as follows: COD cr It is 5350mg / L, BOD 5 It is 540mg / L, the chromaticity is 600 times, and the pH value is 7.

[0059] This embodiment is carried out in the actual leachate treatment project: the Fenton's reagent used is made of H 2 o 2 and FeSO 4 .7H 2 Composition of O, H 2 o 2 and FeSO 4 .7H 2 The molar ratio of O is 5:1.

[0060] Pump out the above-mentioned concentrated water from the concentrated water storage tank at a rate of 625L per hour, pass hydrochloric acid into the pipe...

Embodiment 3

[0062] Embodiment 3, processing the concentrated water produced in the landfill leachate treatment process

[0063] The concentrated water produced in the landfill leachate treatment to be treated in this embodiment is the comprehensive concentrated water that is passed into the concentrated water storage tank respectively from the concentrated water generated in the treatment process of the landfill leachate nanofiltration membrane and the reverse osmosis membrane. The water quality is as follows: COD cr It is 3200mg / L, BOD 5 It is 330mg / L, the chromaticity is 480 times, and the pH value is 6.5.

[0064] This embodiment is carried out in the actual leachate treatment project: the Fenton's reagent used is made of H 2 o 2 and FeSO4.7H20 composition, H 2 o 2 and FeSO 4 .7H 2 The molar ratio of O is 4:1.

[0065] Pump out the above-mentioned concentrated water from the concentrated water storage tank at a rate of 625L per hour, pass hydrochloric acid into the pipeline lea...

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Abstract

The invention discloses a method and device for treating landfill leachate thick water. The thick water treatment method comprises the following steps: regulating the pH value of water to be treated to 2-8, and adding a Fenton reagent composed of hydrogen peroxide and FeSO4.7H2O to carry out oxidation reaction, thus obtaining water subjected to thick water oxidation treatment, wherein when measured by the hydrogen peroxide, the dosage of the Fenton reagent is 90-250 millimoles of hydrogen peroxide for every liter of thick water; in the Fenton reagent, the mol ratio of the hydrogen peroxide to the FeSO4.7H2O is (2:1)-(10:1); and the thick water is obtained by sequentially carrying out biochemical treatment and membrane treatment on landfill leachates, and the membrane treatment is nanofiltration membrane treatment and/or reverse osmosis membrane treatment. By using the invention, the COD (Chemical Oxygen Demand) Cr removal rate of the thick water is higher than 98%, the color removal rate is higher than 95%, and the BOD (Biochemical Oxygen Demand) 5 removal rate is higher than 96%. The invention can be widely used for the treatment processes of various landfill leachates.

Description

technical field [0001] The invention relates to a method and device for treating landfill leachate, in particular to a method and device for treating concentrated landfill leachate water produced by nanofiltration and reverse osmosis membrane treatment. Background technique [0002] Landfill leachate is sewage with high concentration and complex components, and its treatment is a difficult problem in domestic and foreign water treatment circles. Landfill leachate mainly contains a large amount of organic pollutants, which can be divided into: biodegradable and difficult to biochemical organic matter. In order to adapt to the characteristics of landfill leachate, the treatment of landfill leachate generally adopts the method of biochemical + membrane treatment. Biochemical treatment is used to remove a large amount of biodegradable organic matter; membrane treatment is used to intercept organic matter and other inorganic pollutants that are difficult to biochemically. Membr...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 赵凤秋
Owner 北京洁绿环境科技股份有限公司
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