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Landfill leachate treatment method

A technology for landfill leachate and a treatment method, applied in the field of landfill leachate treatment, can solve the problems of shortening the service life of the membrane, high effluent COD, poor ability to adapt to changes in water quality, etc. biochemical effects

Inactive Publication Date: 2020-05-12
北京首钢生物质能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the existing treatment process is that the conventional biochemical treatment system has poor ability to adapt to water quality changes, and the conventional biochemical system is difficult to operate stably for a long time
For some refractory components in the leachate, conventional biochemical treatment systems cannot be used, resulting in high effluent COD and ammonia nitrogen, which is not conducive to the operation of subsequent membrane processes such as nanofiltration and reverse osmosis, and greatly shortens the service life of the membrane. Therefore, it is necessary to provide a The new landfill leachate treatment system and its method improve the biodegradability of landfill leachate, so that the water quality of the treated leachate reaches the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A leachate treatment method, comprising the steps of:

[0039] S1. Primary sedimentation: Garbage leachate enters the primary sedimentation tank to remove large suspended particles;

[0040] S2. Oxidation and precipitation: the supernatant flowing out of the primary sedimentation tank enters the first oxidation tank, and hydrogen peroxide and ferrous sulfate with a molar ratio of 1:1 are added to the first oxidation tank, and the ferrous sulfate in the first oxidation tank is controlled. The concentration of iron salt is 150mg / L, the reaction time is 1h, and the pH value is adjusted to 3 during the process, and the hydroxyl radicals generated by the reaction of hydrogen peroxide and ferrous sulfate oxidize and decompose organic matter;

[0041] Then enter the first settling tank, add lye to the first settling tank, adjust the pH value of the leachate in the first settling tank to be 10, and aerate for 1 hour, so that the iron ion in the leachate of the first settling ta...

Embodiment 2

[0051] A leachate treatment method, carried out according to the method in Example 1, the difference is that S2, oxidation, precipitation: the supernatant that flows out in the primary sedimentation tank enters in the first oxidation tank, and the molar ratio of adding in the first oxidation tank is 1:1 hydrogen peroxide and ferrous chloride, and the concentration of ferrous salt in the first oxidation tank is controlled to 100mg / L, the reaction time is 1.5h, and the pH value is adjusted to 3 during the process, hydrogen peroxide and sulfurous acid The hydroxyl radicals generated by the iron reaction oxidize and decompose organic matter;

[0052] Then enter the first settling tank, add lye to the first settling tank, adjust the pH value of the leachate in the first settling tank to 9.5, and aerate for 1.5h, so that the iron ion in the leachate of the first settling tank is precipitated as hydroxide Iron, while removing residual hydrogen peroxide;

[0053] The supernatant of t...

Embodiment 3

[0057] A leachate treatment method, carried out according to the method in Example 1, the difference is that S2, oxidation, precipitation: the supernatant that flows out in the primary sedimentation tank enters in the first oxidation tank, and the molar ratio of adding in the first oxidation tank is 1:1 hydrogen peroxide and ferrous chloride, and the concentration of ferrous salt in the first oxidation tank is controlled to 200mg / L, the reaction time is 1h, and the pH value is adjusted to 3 during the process, hydrogen peroxide and ferrous sulfate The hydroxyl radicals generated by the reaction oxidize and decompose organic matter;

[0058] Then enter the first settling tank, add lye to the first settling tank, adjust the pH value of the leachate in the first settling tank to 10.5, and aerate for 1 hour, so that the iron ion in the leachate of the first settling tank is precipitated as ferric hydroxide , while removing residual hydrogen peroxide;

[0059] The supernatant of t...

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Abstract

The invention discloses a landfill leachate treatment method. The method comprises the following steps: primary sedimentation; oxidation and sedimentation: a supernatant flowing out of a primary sedimentation tank enters a first oxidation tank, hydrogen peroxide and ferrite are added to generate hydroxyl radicals, the product enters a first sedimentation tank for sedimentation, the supernatant enters a second oxidation tank, iron powder and persulfate are added to generate sulfate free radicals, the sulfate free radicals enter a third oxidation tank, hydrogen peroxide is added into a third oxidation tank to generate hydroxyl free radicals, and a leachate in the third oxidation tank enters a second sedimentation tank for sedimentation; anaerobic reaction; MBR biochemical treatment; nanofiltration, and reverse osmosis. The method has the advantages that the biodegradability of the landfill leachate can be improved when the method is used for treating the landfill leachate, removal of CODthrough nanofiltration and reverse osmosis advanced treatment is better facilitated, the blocking problem occurring during subsequent advanced treatment such as reverse osmosis can be prevented, andthe final treated water quality of the landfill leachate reaches the standard.

Description

technical field [0001] The invention relates to the technical field of water treatment, more specifically, it relates to a landfill leachate treatment method. Background technique [0002] Leachate specifically refers to the waste water produced by the physical, biological and chemical effects of compaction, fermentation, etc., as well as the seepage of precipitation and other external water during the process of stacking and landfilling garbage. It has many types of pollutants and complex components. , Unstable water quality changes, poor biodegradability and other characteristics. At present, the combined process of "pretreatment + biochemical treatment (MBR) + nanofiltration + reverse osmosis" is generally used to treat the leachate of domestic waste landfill in China. For example, the Chinese patent application publication number CN109607972A discloses a zero-discharge landfill leachate The treatment device consists of a pretreatment device, anaerobic device, nitrificat...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/06C02F101/30
CPCC02F9/00C02F1/447C02F2001/007C02F1/722C02F1/725C02F1/66C02F1/444C02F1/442C02F1/441C02F3/302C02F2101/30C02F2103/06C02F2305/023C02F2305/02C02F7/00
Inventor 张伟刘健张爱春牛永健
Owner 北京首钢生物质能源科技有限公司
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