A kind of membrane adsorption deep defluorination treatment system and method

A technology of membrane adsorption and fluorine treatment, applied in the direction of adsorption water/sewage treatment, special treatment targets, water/sewage treatment, etc., can solve the problems of membrane clogging pollution, difficult to control particle size, unfavorable fluoride ion removal, etc., to achieve improved Effects of adsorption efficiency and regeneration efficiency, increased effective contact, and flexible application forms

Active Publication Date: 2022-07-19
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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Problems solved by technology

However, by adding calcium salts and phosphates to water to form calcium phosphate nanoparticles to remove fluoride in the form of precipitation, it is not conducive to the removal of low-concentration fluoride ions, and it is difficult to achieve advanced treatment. Secondly, it is difficult to control the particle size of calcium phosphate nanoparticles, and the particles are located in the The internal pores of the ultrafiltration membrane, the particles themselves and the formed fluoroapatite precipitation are all easy to cause membrane clogging and pollution, which is not conducive to the stable operation of the system

Method used

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  • A kind of membrane adsorption deep defluorination treatment system and method
  • A kind of membrane adsorption deep defluorination treatment system and method

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Effect test

Embodiment 1

[0031] The fluoride ion content of an industrial wastewater is 10mg / L and the pH is 11. The wastewater is treated as follows:

[0032] The wastewater was treated with a membrane adsorption module, the membrane material was polyvinylidene fluoride, the membrane pore size was 0.05 μm, and the inner support layer of the membrane adsorption module was thermally fixed and modified with activated alumina. After the fluorine-containing wastewater is adjusted to pH 7, it enters the membrane adsorption module through the pressure lift pump for filtration and adsorption, and the membrane flux is controlled to 130L / ㎡h. After membrane filtration, the concentrated water is returned to the sludge thickening tank. The membrane adsorption module is used for the first time. The fluoride ion content of the produced water was 0.5 mg / L, and the adsorption capacity was 2.6 mg / g.

[0033] When the adsorption of the membrane adsorption module is saturated, use 1.5% sodium hydroxide solution to enter...

Embodiment 2

[0040] The fluoride ion content of the reverse osmosis concentrated water of a factory is 5mg / L and the pH is 6.5. The wastewater is treated as follows:

[0041] The wastewater was treated with a membrane adsorption module, the membrane material was polyvinylidene fluoride, the membrane pore size was 0.01 μm, and the inner support layer of the membrane adsorption module was thermally fixed and modified with activated alumina. The fluorine-containing wastewater enters the membrane adsorption module through the pressure lift pump for filtration and adsorption. The membrane flux is controlled to be 150L / ㎡h. After membrane filtration, the concentrated water is returned to the sludge thickening tank. The membrane adsorption module is used for the first time. The fluoride ion content of the produced water is 0.4mg / L, the adsorption capacity is 2.7mg / g.

[0042] When the adsorption of the membrane adsorption module is saturated, use 1.5% sodium hydroxide solution to enter the membrane ...

Embodiment 3

[0049] After chemical precipitation of industrial wastewater from a factory, the fluoride ion content of the produced water is 45 mg / L and the pH is 6. The wastewater is treated as follows:

[0050] The wastewater was treated with a membrane adsorption module, the membrane material was polyvinylidene fluoride, the membrane pore size was 0.1 μm, and the inner support layer of the membrane adsorption module was thermally fixed and modified with activated alumina. The chemical precipitation water enters the membrane adsorption module for filtration and adsorption after flocculation and precipitation. The membrane flux is controlled to be 70L / ㎡h. After membrane filtration, the concentrated water is returned to the sludge thickening tank. The membrane adsorption module is used for the first time. is 0.6 mg / L, and the adsorption capacity is 2.8 mg / g.

[0051] When the adsorption of the membrane adsorption module is saturated, use 1.5% sodium hydroxide solution to enter the membrane ...

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Abstract

A membrane adsorption deep defluorination treatment system and method belong to the technical field of deep defluorination. A membrane adsorption deep defluorination treatment system includes a membrane adsorption component, the membrane adsorption component includes a surface film and an internal support layer, and the internal support layer of the membrane adsorption component is modified by activated alumina and has an active site for adsorbing fluoride ions. The present invention has the following beneficial technical effects: 1. The present invention utilizes membrane modules to strengthen mass transfer processes such as fluoride ions, increases the effective contact between fluoride ions and adsorbents, thereby improving the adsorption efficiency and regeneration efficiency of the adsorbents, and is suitable for advanced treatment of fluoride ions, Effectively control the fluorine concentration <1mg / L; 2. The membrane adsorption module of the present invention can perform filtration and adsorption at the same time, and can be used for advanced treatment of pretreatment chemical fluorine removal, and at the same time the concentrated liquid is refluxed to strengthen chemical fluorine removal, or used in the concentration unit. The deep defluorination of water is flexible in application form and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of deep defluorination, and relates to a membrane adsorption deep defluorination treatment system and method. Background technique [0002] Fluorine is an indispensable trace element for the human body. An appropriate amount of fluorine can play a positive role in human health, but excessive intake of fluorine will seriously affect human health. When the fluoride concentration in drinking water is lower than 0.5mg / L, it will cause dental caries in children; when the fluoride concentration in drinking water is higher than 1.5mg / L, it will cause dental fluorosis; when the fluoride concentration is 3-6mg / L, it will cause dental fluorosis. Development of disabling skeletal fluorosis. [0003] Some industrial wastewater contains a large amount of fluoride, and the wanton discharge will cause serious environmental pollution, affect human health, and even destroy the ecological balance. At present, the treatment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/44C02F9/04C02F101/14
CPCC02F1/285C02F1/44C02F1/444C02F9/00C02F2101/14C02F1/66C02F2303/14C02F2303/16
Inventor 王强王启伟李志强
Owner BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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