Disposal method of using As-containing wastewater in LED industry for preparing electronic-grade ultrapure water

A treatment method, electronic-level technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, non-polluted water treatment, etc., can solve the problem of increasing the cost of subsequent hazardous waste/solid waste treatment and large sludge output , waste of water resources and other issues, to achieve the effect of reducing sludge production, realizing zero discharge of wastewater, and reducing waste

Inactive Publication Date: 2019-05-21
BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional As-containing wastewater treatment process mostly adopts the multi-stage flocculation-sedimentation method, and the treated wastewater can only meet the "Integrated Wastewater Discharge Standard" (level 3) standard, and enterprises often discharge directly without wastewater reuse treatment, resulting in a large number of water waste
Moreover, the sludge output of the multi-stage flocculation and sedimentation method is large, which increases the cost of subsequent hazardous waste / solid waste treatment

Method used

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  • Disposal method of using As-containing wastewater in LED industry for preparing electronic-grade ultrapure water
  • Disposal method of using As-containing wastewater in LED industry for preparing electronic-grade ultrapure water
  • Disposal method of using As-containing wastewater in LED industry for preparing electronic-grade ultrapure water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] An LED industry contains As-containing wastewater, in which the As content is 35mg / L, the conductivity=200μs / cm, and the pH=6.7.

[0042] Step (1): Take 20 L of the above wastewater, add 0.5g / L pretreatment agent, stir and react for 20 minutes, add sodium hydroxide to adjust pH=8, let stand and filter, the filtrate pH=7.2;

[0043]Step (2): After step (1), the effluent water enters the adsorption system, the adsorption water flow rate is 5BV / h, the amount of activator added is 0.05%, and the aeration rate is 1mL / min;

[0044] Step (3): The effluent from step (2) enters the ultrafiltration system, in which the security filter selects a PP cotton filter element with a pore size of 5 μm, and the ultrafiltration membrane selects a hollow fiber membrane made of polyvinylidene fluoride with a pore size of 0.005 μm. Choose 0.1MPa, the operating temperature is 25 degrees Celsius;

[0045] Step (4): The effluent from step (3) enters the reverse osmosis system. The reverse osmos...

Embodiment 2

[0050] An LED industry contains As-containing wastewater, in which the As content is 10 mg / L, the conductivity is 100 μs / cm, and the pH is 7.2.

[0051] Step (1): After the As-containing wastewater is directly filtered, it enters the adsorption system, the adsorption water flow rate is 5 BV / h, the amount of activator is 0.1%, and the aeration rate is 1mL / min;

[0052] Step (2): The effluent from step (1) enters the ultrafiltration system, in which the security filter selects a PP cotton filter element with a pore size of 5 μm, and the ultrafiltration membrane selects a hollow fiber membrane made of polyvinylidene fluoride with a pore size of 0.005 μm. Choose 0.15MPa, the operating temperature is 25 degrees Celsius;

[0053] Step (3): The effluent from step (2) enters the reverse osmosis system, using only one-stage reverse osmosis with a membrane pressure of 2MPa and an operating temperature of 25 degrees Celsius.

[0054] Step (5): The effluent from step (4) enters the EDI s...

Embodiment 3

[0058] An LED industry contains As-containing wastewater, in which the As content is 100 mg / L, the conductivity=500μs / cm, and the pH=5.9.

[0059] Step (1): Take 20 L of the above wastewater, add 1g / L pretreatment agent, stir and react for 20 minutes, add sodium hydroxide to adjust pH = 8, let stand and filter, the filtrate pH = 7.2;

[0060] Step (2): After step (1), the filtered effluent enters the adsorption system, the adsorption water flow rate is 4BV / h, the amount of activator added is 0.1%, and the aeration rate is 2mL / min;

[0061] Step (3): The effluent from step (2) enters the ultrafiltration system, in which the security filter selects a PP cotton filter element with a pore size of 5 μm, and the ultrafiltration membrane selects a hollow fiber membrane made of polyvinylidene fluoride with a pore size of 0.005 μm. Choose 0.1MPa, the operating temperature is 25 degrees Celsius;

[0062] Step (4): The effluent from step (3) enters the reverse osmosis system. The revers...

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Abstract

The invention discloses a disposal method of using As-containing wastewater in the LED industry for preparing electronic-grade ultrapure water. According to the method, the wastewater is subjected topretreatment first to reduce the As content, enters an adsorption system and then sequentially enters an ultrafiltration system, a reverse osmosis system and an EDI system for disposal after As is completely removed through the adsorption system, and final effluent after disposal satisfies the reuse standard of the electronic-grade ultrapure water. By means of the method, not only can As in the wastewater be completely removed, but also the wastewater can be prepared into the electronic-grade ultrapure water, reuse requirements of enterprises are met, waste of water sources is reduced, the generation amount of sludge is reduced, zero discharge of the wastewater is achieved, and a broad application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of advanced wastewater treatment, and in particular relates to a treatment method for preparing electronic-grade ultrapure water by utilizing As-containing wastewater in the LED industry. Background technique [0002] In the LED industry, the production of red and yellow light (gallium arsenide GaAs) chips involves cleaning, grinding, cutting and other processes, and a large amount of As-containing wastewater will be generated during the process. The traditional As-containing wastewater treatment process mostly adopts the multi-stage flocculation-sedimentation method, and the treated wastewater can only meet the "Integrated Wastewater Discharge Standard" (level 3) standard, and enterprises often discharge directly without wastewater reuse treatment, resulting in a large number of Waste of water. Moreover, the sludge output of the multi-stage flocculation-sedimentation method is large, which increases the cost of subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/10C02F103/04
Inventor 刘晨明李雅陶莉吴青谚李志强
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL SCI & TECH
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