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A treatment method for fluorine-containing reused water

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

Active Publication Date: 2020-09-11
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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  • A treatment method for fluorine-containing reused water
  • A treatment method for fluorine-containing reused water
  • A treatment method for fluorine-containing reused water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this embodiment, 2L of fluorine-containing wastewater from a microelectronics manufacturing plant is taken with the fluorine-containing wastewater in the electronics industry. The raw water pH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L. Electrode method is used to measure the fluoride ion concentration in the water, and the lower limit of detection is 15.1 μg / L), and the waste water is processed by the processing method of the present invention, and the specific steps are as follows:

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

[0042] (2) Flocculation and precipitation, step (1) introduce the coagulant PAC into the wastewater after the chemical precipitation reaction occurs, so that the fine precipitation produces larger particles, and then adjust t...

Embodiment 2

[0058] In this embodiment, 2L of fluorine-containing wastewater from a microelectronics manufacturing plant is taken with the fluorine-containing wastewater in the electronics industry. The raw water pH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L. Electrode method is used to measure fluoride ion concentration in the water, and the lower limit of detection is 15.1 μ g / L), utilizes the processing method of the present invention to process waste water, and concrete steps are as follows:

[0059] (1) Regulate the pH value of waste water to 8~9, introduce excessive calcium hydroxide and calcium chloride solution wherein, make it take place chemical precipitation reaction to generate calcium fluoride; Take the mass concentration of fluorine in the water body as a benchmark, said hydroxide The dosage of calcium is The dosage of calcium chloride is

[0060](2) Flocculation and precipitation, step (1) introduce the coagulant PAC int...

Embodiment 3

[0075] In this embodiment, 2L of fluorine-containing wastewater from a microelectronics manufacturing plant is taken with the fluorine-containing wastewater in the electronics industry. The raw water pH value is 2.84, the COD concentration is 86mg / L, and the fluoride ion concentration is 364mg / L. Electrode method is used to measure the fluoride ion concentration in the water, and the lower limit of detection is 15.1 μg / L), and the waste water is processed by the processing method of the present invention, and the specific steps are as follows:

[0076] (1) Adjust the pH value of waste water to 8-9, introduce excessive calcium hydroxide and calcium chloride solution therein, make it produce calcium fluoride by chemical precipitation reaction; take the mass concentration of fluorine in the water body as a benchmark, said hydroxide The dosage of calcium is The dosage of calcium chloride is

[0077] (2) Flocculation and precipitation, step (1) introduce the coagulant PAC into ...

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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 reused water in the electronics industry. Background technique [0002] With the rapid development of electronic products in recent years, the discharge of wastewater from the electronics industry is increasing day by day. In addition, due to the increasingly complex preparation process of the electronics industry, the difficulty of electronic wastewater treatment is also increasing. At present, the main sources of electronic wastewater include grinding, chemical etching, black / brown oxidation, deburring, desmear removal, plated through holes, tin plating, copper plating, tin stripping, solder resist green paint, development and molding cleaning. Therefore, electronic wastewater contains a variety of substances that need to be treated and have negative effects on the environment, including fluoride ions. Taking semico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/14
CPCC02F1/001C02F1/32C02F1/42C02F1/441C02F1/469C02F1/5236C02F1/56C02F1/722C02F9/00C02F2101/14C02F2301/08
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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