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A process for deep defluoridation of fluorine-containing water by precipitation and adsorption

A technology of precipitation adsorption and depth, applied in the direction of adsorption of water/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problems of high cost of adsorption and defluorination, substandard fluoride effluent, unsatisfactory effect, etc., to achieve improvement The effect of fluoride removal, avoiding difficult control, and reducing the effect of solid waste in the later stage

Active Publication Date: 2022-04-29
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems in the prior art that the fluoride removal water does not meet the standard, and the cost of adsorption and removal of fluorine is high, and the effect is not ideal, the present invention provides a process for the precipitation and adsorption depth of fluorine-containing water. The treated fluorine-containing wastewater is subjected to advanced treatment, and the water body is adjusted to a suitable pH before treatment, thereby promoting the protonation of metal ions in the subsequent chelating resin, thereby enhancing the performance of adsorption and defluorination

Method used

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  • A process for deep defluoridation of fluorine-containing water by precipitation and adsorption
  • A process for deep defluoridation of fluorine-containing water by precipitation and adsorption
  • A process for deep defluoridation of fluorine-containing water by precipitation and adsorption

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Embodiment 1

[0035] In the present embodiment, adopt NDA-F-A type resin, respectively adopt polyaluminum chloride of different contents, polyferric chloride, the fluorine-containing waste water of electronics industry to different fluoride ion concentration and pH (waste water is after certain pretreatment, Fluoride ion concentration is lower than 20mg / L) for treatment, the specific treatment steps are as follows:

[0036] S100, at 200r·min -1 Add polyaluminum chloride at a certain stirring rate, and add polyferric chloride 5 minutes later to adjust the pH of the water body; wherein, the overall concentration of the two is 100mg / L;

[0037] S200, after reacting for 3 minutes, reduce the stirring speed to 50r·min -1 , continue stirring for 30 minutes, then stop stirring and settling for 30 minutes;

[0038] S300, introducing the effluent of the supernatant after the pH adjustment and precipitation into the resin adsorption column for adsorption, and the waste water passes through the resi...

Embodiment 2

[0044] In this embodiment, adopt NDA-F-A type resin, respectively adopt different coagulants (the content of polyaluminum chloride, polyferric chloride is different), to the fluorine-containing waste water of chemical industry of different fluoride ion concentration and pH (waste water is passed through After certain pretreatment, the fluoride ion concentration is lower than 20mg / L) for treatment, the specific treatment steps are as follows:

[0045] S100, at 200r·min -1 Add polyaluminum chloride at a certain stirring rate, and add polyferric chloride 5 minutes later to adjust the pH of the water body; wherein, the overall concentration of the two is 100mg / L;

[0046] S200, after reacting for 3 minutes, reduce the stirring speed to 50r·min -1

[0047] Continue stirring for 30 minutes, then stop stirring and settling for 30 minutes;

[0048] S300, introducing the effluent of the supernatant after the pH adjustment and precipitation into the resin adsorption column for adsorp...

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Abstract

The invention discloses a fluorine-containing water body precipitation adsorption depth defluorination process, which belongs to the technical field of fluorine-containing wastewater treatment. The present invention adopts resin to carry out adsorption treatment on the fluorine-containing water body that has been pretreated to a certain extent, which can effectively avoid major problems caused by precipitation method or chemical method for fluorine removal, and has the characteristics of safety, high efficiency, easy operation, and convenient planning and application. The technological process is simple, the processing cost is low, and the method has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of fluorine-containing wastewater treatment, and more specifically relates to a novel fluorine-containing water body precipitation adsorption depth removal process. Background technique [0002] Some industrial processes, such as printing and dyeing, metallurgy, phosphate fertilizer production, electroplating, etc., contain fluoride in different concentrations. Carry out effective treatment to reduce it to the corresponding national standard (less than 10mg / L) before it can be discharged or used. [0003] There are many methods to treat fluoride in wastewater, such as precipitation, adsorption, electrocoagulation, electrodialysis, and reverse osmosis membrane, etc., but the concentration of the effluent after the above methods is still above 20mg / L and cannot meet the discharge standard. Such as the common precipitation method, by adding chemicals such as lime and calcium chloride to the water body, Ca 2+ ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F9/04C02F101/14
CPCC02F1/285C02F1/5236C02F1/66C02F2101/14
Inventor 张炜铭张宁黄如全贾如雪张婧玥张孝林卢永朱兆坚吕振华
Owner NANJING UNIV
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