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Fluorine-containing wastewater treatment method

A treatment method and technology for wastewater, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as inability to treat fluorine pollution in depth, achieve low pH requirements, and have a wide range of applications , the effect of simple process

Inactive Publication Date: 2020-08-25
CHANGSHA SCI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the current problem that fluorine pollution cannot be treated in depth, the purpose of the present invention is to propose a treatment method for fluorine-containing wastewater, which uses chemical precipitation and modified strong basic anion resin to perform advanced treatment of fluorine in wastewater, and finally effluent Fluorine stable below 1mg / L

Method used

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  • Fluorine-containing wastewater treatment method

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Effect test

Embodiment 1

[0027] Take fluorine-containing wastewater from a copper smelter, its pH=6.36, and its fluorine content is 21.68mg / L.

[0028] Modification of strong basic anion resin D301:

[0029] Firstly wash the strongly basic anion resin with clear water for 20-30 minutes, wash it 2-3 times, then use 5wt% hydrochloric acid to shake and activate the strong basic anion resin for 1-2 hours; then use 5wt% sodium hydroxide solution to The strong basic anion resin is shaken and activated for 1 to 2 hours; rinsed with water to neutrality, and finally the strong basic anion resin is modified with a modifying solution to obtain the modified strong basic anion resin for use. The modifying solution is a 10wt% mixed solution prepared by compounding 90% aluminum sulfate and 10% lanthanum nitrate.

[0030] The specific processing process is:

[0031] (1) Since the pH of the raw water of fluorine-containing wastewater is within the scope of the present invention, there is no need to call back;

[00...

Embodiment 2

[0042] Take fluorine-containing wastewater from a copper smelter, its pH=10.14, and its fluorine content is 13.8mg / L.

[0043] Modification of strong basic anion resin 201:

[0044] First, wash the strongly basic anion resin with clear water for 20-30 minutes and wash it for 2-3 times, then use 5wt% sulfuric acid to vibrate and activate the strong basic anion resin for 1-2 hours; then use 5wt% sodium carbonate solution to The anion resin is vibrated and activated for 1-2 hours; rinsed with clear water until neutral, and finally modified with 10wt% polyaluminum chloride solution to obtain the modified strongly basic anion resin for use.

[0045]The specific processing process is:

[0046] (1) Due to the high pH of the raw water of fluorine-containing wastewater, first use 10wt% dilute sulfuric acid to adjust it to 6.5;

[0047] (2) Add 0.5g / L chemical defluorinating agent to the fluorine-containing wastewater, and stir for 15 minutes. The chemical defluorinating agent is comp...

Embodiment 3

[0052] Take fluorine-containing wastewater from a copper smelter, its acidity is 0.1mol / L, and the fluorine content is 53.64mg / L.

[0053] Modification of strong basic anion resin D301:

[0054] Firstly wash the strongly basic anion resin with clean water for 20-30 minutes, and wash it for 2-3 times, then use 5wt% sodium hydroxide solution to activate the strong basic anion resin for 1-2 hours; The modified strongly basic anion resin is prepared by modifying the strong anion resin, and the modified solution is a 10wt% solution compounded by 70% aluminum chloride and 30% lanthanum chloride.

[0055] The specific processing process is:

[0056] (1) Due to the high acidity of the raw water of fluorine-containing wastewater, sodium hydroxide is added to adjust the pH to 5;

[0057] (2) Add 2g / L chemical defluorinating agent to fluorine-containing wastewater, and stir for 20 minutes. The chemical defluorinating agent is a 30wt% solution prepared by combining 80% aluminum nitrate ...

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Abstract

The invention discloses a fluorine-containing wastewater treatment method, which comprises the following steps: (1) regulating the pH value of the fluorine-containing wastewater to 3-8, and adding a chemical defluorinating agent into the fluorine-containing wastewater to react; after the reaction, adding an alkali to adjust the pH value of the reaction solution to 6-9, adding polyacrylamide to carry out a flocculation reaction, and carrying out solid-liquid separation to obtain a primary purified solution and primary filter residues; and (2) carrying out dynamic adsorption on the primary purified liquid by adopting modified strongly basic anion resin, and deeply removing fluorine in the primary purified liquid to obtain a secondary purified liquid. According to the invention, Fluorine in the wastewater is deeply treated through a chemical precipitation method and modified strongly basic anion resin, and fluorine in final effluent is stably lower than 1 mg / L.

Description

technical field [0001] The invention relates to a treatment method for fluorine-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] Fluorine is one of the widely distributed elements in nature. Among all the elements, fluorine ranks 13th in the earth's crust, mainly composed of fluorite (CaF2), cryolite (Na3[AlF6]) and fluoroapatite (Ca10(PO4)6F2 )exist. Fluorine is widely used in industry, and can be used to synthesize coolants such as Freon; used to make fluorinated reagents (xenon difluoride, etc.) and fluxes (cryolite, etc.) in metal smelting; ClF3 and BrF3 can be used as rockets Fuel oxidant; for the system of pesticides and fire extinguishing agents and so on. [0003] Trace amounts of fluorine are beneficial to prevent dental caries. If the fluorine content in water is less than 0.5 ppm, the incidence rate of dental caries will reach 70% to 90%. However, if the fluoride content in drinking water exceeds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/14
CPCC02F1/00C02F1/42C02F1/56C02F1/583C02F1/66C02F9/00C02F2001/422C02F2101/14C02F2303/14C02F2303/16
Inventor 高伟荣易玉龙蒋国民闫虎祥高宝钗廖圆毛春奎骆兆宇
Owner CHANGSHA SCI ENVIRONMENTAL TECH
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