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Processing method and system of landfill leachate

A treatment method and permeate technology, applied in the field of water treatment, can solve the problems of low total recovery rate, membrane fouling, etc., and achieve the effect of zero discharge and optimized pretreatment process

Inactive Publication Date: 2019-10-11
青岛沃赛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art, seek to design a treatment process for landfill permeate, and solve the problems of serious membrane pollution, low total recovery rate and membrane pollution in the existing process

Method used

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  • Processing method and system of landfill leachate
  • Processing method and system of landfill leachate
  • Processing method and system of landfill leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 As shown, the treatment method of the landfill permeate involved in this embodiment specifically comprises the following steps:

[0021] (1) First pass through the ultrafiltration device to remove some macromolecular organics, colloids and particles, and then add lime milk to the ultrafiltration water, and in the reaction tank, the lime milk and water-soluble metal ions (such as Ca 2+ 、Ba 2+ 、Sr 2+ , Fe 3+ ) and other reactions to generate insoluble matter or colloids, which flow into the settling tank for sedimentation, and the generated sludge is sent to the filter press for compression, and the obtained filter cake is treated as solid waste, and the filtrate obtained by the filter press is returned to the settling tank for settling The supernatant of the tank is sent to the microfiltration device for filtration to remove macromolecular substances and insoluble particles in the water, then sodium hypochlorite is added to the water produced by the m...

Embodiment 2

[0024] Such as figure 1 As shown, the treatment method of the landfill permeate involved in the present embodiment, steps (1) and (2) are the same as in Example 1, and other steps are specifically:

[0025] (3) Pump the reverse osmosis concentrate into the nanofiltration device, add an appropriate amount of scale inhibitor to the influent of the nanofiltration device, effectively avoid the precipitation of alkaline earth metals, adjust the influent to be neutral and acidic, and avoid the precipitation of insoluble carbonates Generate, the recovery filtration of the nanofiltration device is 65%, and the nanofiltration device adopts a nanofiltration membrane with a molecular weight cut-off of 400-800Da;

[0026] (4) The nanofiltration permeate produced after the step (3) is processed is returned to the reverse osmosis device for circulation treatment, and is used as the reverse osmosis device water inlet together with the degassing pool effluent. As can be seen from Table 1, the...

Embodiment 3

[0031] Such as figure 1 As shown, the treatment method of the landfill permeate involved in the present embodiment, steps (1) and (2) are the same as in Example 1, and other steps are specifically:

[0032] (3) Pump the reverse osmosis concentrate into the nanofiltration device, add an appropriate amount of scale inhibitor to the influent of the nanofiltration device, effectively avoid the precipitation of alkaline earth metals, adjust the influent to be neutral and acidic, and avoid the precipitation of insoluble carbonates Generate, the recovery filtration of the nanofiltration device is 65%, and the nanofiltration device adopts a nanofiltration membrane with a molecular weight cut-off of 200-400Da;

[0033] (4) The nanofiltration permeate produced after the step (3) is processed is returned to the reverse osmosis device for circulation treatment, and is used as the reverse osmosis device water inlet together with the degassing pool effluent. As can be seen from Table 1, the...

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Abstract

The invention discloses a processing method of landfill leachate, and belongs to the technical field of wastewater processing. By means of an ultra-filtration device, part of macromolecular organic matter, colloid and particles are removed, and lime milk is added to ultra-filtration produced water for depositing and degassing treatment; water is sent into a reverse osmosis device for deep treatment, and the reverse osmosis device has the recovery rate of 65-70%; a concentrated solution of the reverse osmosis device is pumped into a nano-filtration device for further treatment, the generated leachate of the nano-filtration device serves as the input water of the reverse osmosis device and returns into the reverse osmosis device for circulating treatment, and the nano-filtration system has the recovery rate of 65% or above; finally, potassium sulfate is obtained as the potassium sulphate chemical fertilizer raw material by conducting freeze-crystallizing, potassium sulphate crystal separating and filtering on the nano-filtration concentrated solution with calcium and magnesium ions removed through adsorption, and filtrate serves as input water of the nano-filtration device and returns to the nano-filtration device for circulating treatment. In the process, the recovering treatment of the reverse osmosis concentrated solution is realized, the zero-discharge of wastewater is realized, and a potash fertilizer in the concentrated solution is recovered.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a treatment method and device for landfill permeate. Background technique [0002] With the expansion of my country's cities and the improvement of residents' living standards, the output of my country's municipal solid waste is increasing sharply. The treatment and disposal of municipal solid waste mainly includes three methods: sanitary landfill, composting and incineration. The sanitary landfill method has the advantages of low investment and treatment costs, relatively mature technology, large treatment capacity, simple operation and management, and wide application range, etc., and is widely used by countries all over the world. Landfill leachate, also known as leachate or leachate, is an inevitable secondary pollutant in landfills. It is a liquid that contains various organic and inorganic pollutants and contains a large number of pathogens. Microorganisms and vir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/122C01D5/00C05D1/02C02F103/06
CPCC02F9/00C02F11/122C01D5/00C05D1/02C02F2103/06C02F1/444C02F1/5236C02F1/72C02F1/20C02F1/441C02F1/442C02F1/42C02F1/22
Inventor 莫文辉周志艳西蒙·拉斯克里
Owner 青岛沃赛环保科技有限公司