Membrane adsorption deep defluorination treatment system and method

A membrane adsorption and fluorine treatment technology, applied in the fields of adsorption water/sewage treatment, special treatment targets, water/sewage treatment, etc. Adsorption efficiency and regeneration efficiency, increasing effective contact, and the effect of flexible application forms

Active Publication Date: 2021-07-13
BEIJING CYCLE COLUMBUS ENVIRONMENTAL TECH RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Membrane adsorption deep defluorination treatment system and method

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Experimental program
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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 by the following method:

[0032] The waste water is treated by using a membrane adsorption module, the membrane material is polyvinylidene fluoride, the membrane pore size is 0.05 μm, and the inner support layer of the membrane adsorption module is modified with activated alumina through thermal fixation. 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. The membrane flux is controlled to 130L / ㎡h. After membrane filtration, the concentrated water is returned to the sludge concentration tank. The membrane adsorption module is used for the first time. The fluoride ion content of the product water is 0.5mg / L, and the adsorption capacity is 2.6mg / g.

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

Embodiment 2

[0040] The fluoride ion content of reverse osmosis concentrated water in a factory is 5mg / L, and the pH is 6.5. The following methods are used to treat the wastewater:

[0041] The waste water is treated with a membrane adsorption module, the membrane material is polyvinylidene fluoride, the membrane pore size is 0.01 μm, and the inner support layer of the membrane adsorption module is modified with activated alumina after heat fixing. The fluorine-containing wastewater enters the membrane adsorption module through the pressure lift pump for filtration and adsorption. The membrane flux is controlled at 150L / ㎡h. After membrane filtration, the concentrated water is returned to the sludge concentration tank. The membrane adsorption module is used for the first time. 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 interior of the membrane module through the regen...

Embodiment 3

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

[0050] The waste water is treated by a membrane adsorption module, the membrane material is polyvinylidene fluoride, the membrane pore size is 0.1 μm, and the inner support layer of the membrane adsorption module is modified with activated alumina after heat fixing. After flocculation and sedimentation, the produced water of chemical precipitation enters the membrane adsorption module for filtration and adsorption. The membrane flux is controlled to 70L / ㎡h. The content is 0.6mg / L, and the adsorption capacity is 2.8mg / g.

[0051] When the adsorption of the membrane adsorption module is saturated, use 1.5% sodium hydroxide solution to enter the interior of the membrane module through the regeneration water pump for regeneration, control the flux of the regeneration memb...

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Abstract

The invention discloses a membrane adsorption deep defluorination treatment system and method, and belongs to the technical field of deep defluorination. A membrane adsorption deep defluorination treatment system comprises a membrane adsorption assembly; the membrane adsorption assembly comprises a surface membrane and an internal supporting layer, and the internal supporting layer of the membrane adsorption assembly is modified by activated aluminum oxide and has active sites for adsorbing fluorine ions. The membrane adsorption deep defluorination treatment system and method have the following beneficial technical effects: 1, the mass transfer process of fluorine ions and the like is enhanced by using the membrane module, and effective contact between the fluorine ions and an adsorbent is increased, so that the adsorption efficiency and regeneration efficiency of the adsorbent are improved, the system and the method are suitable for deep treatment of the fluorine ions, and the fluorine concentration is effectively controlled to be less than 1 mg / L; and 2, the membrane adsorption assembly can simultaneously perform filtration and adsorption, can be used for advanced treatment of pretreatment chemical defluorination, enhanced chemical defluorination through concentrated solution backflow or advanced defluorination of concentrated water in a concentration unit, and is flexible in application form and simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of deep fluorine removal, and relates to a membrane adsorption deep fluorine removal 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 fluorine concentration in drinking water is higher than 1.5mg / L, it will cause dental fluorosis; Develops disabling skeletal fluorosis. [0003] Some industrial wastewater contains a large amount of fluoride, and wanton discharge will cause serious environmental pollution, affect human health, and even destroy the ecological balance. At present, the treatment methods of fluorine-containing wastewater are mainly precipitation method, floccul...

Claims

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Application Information

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Patent Type & Authority Applications(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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