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Method for treating fluorine-containing reuse water

A treatment method and technology for water reuse, applied in multi-stage water treatment, water/sewage treatment, light water/sewage treatment, etc., can solve problems such as the inability to meet ultrapure water requirements, reduce fluorine content, and improve recycling. The effect of high efficiency and removal efficiency

Active Publication Date: 2019-11-15
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluoride ion concentration in the effluent water of the commonly used precipitation, adsorption, electrochemical and membrane treatment methods is usually at the mg / L level, which cannot meet the requirements of ultra-pure water in the electronics industry.

Method used

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  • Method for treating fluorine-containing reuse water
  • Method for treating fluorine-containing reuse water
  • Method for treating fluorine-containing reuse water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment takes fluorine-containing wastewater from the electronics industry, taking 2L of fluorine-containing wastewater from a microelectronics manufacturing plant, the raw water PH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L as the object (the present invention uses direct ion selection The fluoride ion concentration in the water was measured by the sex electrode method, and the detection limit was 15.1 μg / L). The wastewater was treated by the treatment method of the present invention. The specific steps are as follows:

[0041] (1) Adjust the pH value of wastewater to 8-9, and introduce excess calcium hydroxide and calcium chloride solution into it to cause a chemical precipitation reaction to generate calcium fluoride.

[0042] (2) Flocculation and sedimentation. Step (1) Introduce coagulant PAC into the wastewater after chemical precipitation reaction to make small sediments generate larger particles, then adjust t...

Embodiment 2

[0058] This embodiment takes fluorine-containing wastewater from the electronics industry, taking 2L of fluorine-containing wastewater from a microelectronics manufacturing plant, the raw water PH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L as the object (the present invention uses direct ion selection The fluoride ion concentration in the water was measured by the sex electrode method, and the detection limit was 15.1 μg / L). The wastewater was treated by the treatment method of the present invention. The specific steps are as follows:

[0059] (1) Adjust the pH value of wastewater to 8-9, and introduce excess calcium hydroxide and calcium chloride solution into it to cause a chemical precipitation reaction to generate calcium fluoride; based on the mass concentration of fluorine in the water, the hydroxide The dosage of calcium is The dosage of calcium chloride is

[0060] (2) Flocculation and sedimentation. Step (1) Introduce co...

Embodiment 3

[0075] This embodiment takes fluorine-containing wastewater from the electronics industry, taking 2L of fluorine-containing wastewater from a microelectronics manufacturing plant, the raw water PH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L as the object (the present invention uses direct ion selection The fluoride ion concentration in the water was measured by the sex electrode method, and the detection limit was 15.1 μg / L). The wastewater was treated by the treatment method of the present invention. The specific steps are as follows:

[0076] (1) Adjust the pH value of wastewater to 8-9, and introduce excess calcium hydroxide and calcium chloride solution into it to cause a chemical precipitation reaction to generate calcium fluoride; based on the mass concentration of fluorine in the water, the hydroxide The dosage of calcium is The dosage of calcium chloride is

[0077] (2) Flocculation and sedimentation. Step (1) Introduce co...

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Abstract

The invention discloses a method for treating fluorine-containing reuse water. The method comprises the following specific steps: (1) pretreatment; (2) flocculation precipitation; (3) filtration-reverse osmosis membrane filtration; (4) total organic carbon (TOC) degradation and ultraviolet sterilization; (5) electrodeionization (EDI) treatment; (6) TOC degradation and ultraviolet sterilization; and (7) precise filtration. The invention has the advantages that water quality of an effluent can reach a standard of ultra-pure water, fluorine removal efficiency is high, the recycling rate of wastewater is high, and operation cost is low.

Description

Technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically, relates to a treatment method for fluorine-containing reuse water in the electronics industry. Background technique [0002] With the rapid development of electronic products in recent years, the discharge of waste water in the electronics industry is increasing. In addition, due to the increasingly complex preparation processes of the electronics industry, the difficulty in treating electronic waste water is also increasing. At present, the main sources of electronic waste water are polishing, chemical etching, black / brown oxidation, deburring, slag removal, through-hole plating, tin plating, copper plating, tin stripping, solder resist green paint, development, and molding cleaning. Therefore, electronic wastewater contains many substances that have negative effects on the environment that need to be treated, including fluoride ions. Taking photovoltaic cell manufacturing,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/14
CPCC02F9/00C02F2101/14C02F1/5236C02F1/56C02F2301/08C02F1/441C02F1/32C02F1/722C02F1/42C02F1/469C02F1/001
Inventor 张炜铭贾如雪张孝林张延扬潘丙才吕路
Owner NANJING UNIV
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