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PH adjusting mixed preparation and application thereof in fluorine-containing water body precipitation adsorption treatment

A technology of precipitation adsorption and compounding agent, which is applied in the fields of flocculation/sedimentation water/sewage treatment, water/sewage treatment, neutralized water/sewage treatment, etc. problems, to avoid difficult control and achieve the effect of good performance

Active Publication Date: 2021-04-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of unsatisfactory defluoridation effect, substandard effluent and high cost in the existing process of deep defluoridation of water bodies using adsorbents, the present invention provides a pH adjustment compound and applies it to the precipitation and adsorption treatment of fluorine-containing water bodies Among them, metal chelating resins are used to carry out advanced treatment of fluorine-containing wastewater that has undergone certain pretreatment. Resin defluorination performance

Method used

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  • PH adjusting mixed preparation and application thereof in fluorine-containing water body precipitation adsorption treatment
  • PH adjusting mixed preparation and application thereof in fluorine-containing water body precipitation adsorption treatment
  • PH adjusting mixed preparation and application thereof in fluorine-containing water body precipitation adsorption treatment

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Embodiment 1

[0037] In this embodiment, NDA-F-A type resin is used to treat fluorine-containing waste water in the electronics industry with different fluoride ion concentrations and pHs (the waste water is pretreated, and the fluoride ion concentration is lower than 20 mg / L).

[0038] The specific processing steps are as follows:

[0039] The first step: preparation of pH adjustment compound

[0040] Add polyaluminum chloride and polyferric chloride to the water under stirring, and after fully stirring and mixing, the defluorinating agent product is obtained as a transparent solution, and the stirring speed is 200r·min -1 , stir for 5min;

[0041] Step 2: Resin adsorption treatment of fluoride-containing water

[0042] S1, at 200r·min -1 Add the above pH adjustment compound at a certain stirring speed, and continue to stir for 1 min after the addition; then reduce the stirring speed to 30r·min -1 Continue to stir for 30 minutes, then settle for 20 minutes; wherein, the dosage concentr...

Embodiment 2

[0049] In this embodiment, NDA-F-A resin is used to treat fluorine-containing wastewater in the chemical industry with different fluoride ion concentration and pH (the wastewater is pretreated, and the fluoride ion concentration is lower than 20mg / L).

[0050] The specific processing steps are as follows:

[0051] The first step: preparation of pH adjustment compound

[0052] Add polyaluminum chloride and polyferric chloride to the water under stirring, and after fully stirring and mixing, the defluorinating agent product is obtained as a transparent solution, and the stirring speed is 200r·min -1 , stir for 5min;

[0053] Step 2: Resin adsorption treatment of fluoride-containing water

[0054] S1, at 200r·min -1 Add the above pH adjustment compound at a certain stirring speed, and continue to stir for 1 min after the addition; then reduce the stirring speed to 20r·min -1 Continue to stir for 30 minutes, then settle for 20 minutes; wherein, the dosage concentration of the ...

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Abstract

The invention discloses a pH adjusting mixed preparation and application thereof in fluorine-containing water body precipitation and adsorption treatment. The mixed preparation comprises the followingcomponents in percentage by weight: 40-60% of polyaluminum chloride and 10-15% of polyferric chloride. The medicines are prepared into a liquid medicament, the liquid medicament is added into fluorine-containing wastewater according to a certain ratio, through mechanical stirring, the pH value of the water body is microscopically regulated to be slightly acidic by using a fluorine removal agent,and a supernatant is introduced into a fluorine removal resin adsorption tower for treatment. The mixed preparation has the advantages of simple steps for preparing and adding the agent, low treatmentcost, high fluorine removal rate and the like.

Description

technical field [0001] The invention belongs to the technical field of fluorine-containing wastewater treatment, and more specifically relates to a novel pH adjusting compound and its application in precipitation and adsorption treatment of fluorine-containing water. Background technique [0002] Rich wastewater mainly comes from industrial production processes such as fluorine chemical industry, polysilicon wafer production, non-ferrous metal smelting, electrical parts cleaning, aluminum electrolysis, etc. The fluorine concentration in the generated wastewater generally ranges from 100-3000mg / L. If fluorine-containing wastewater is discharged without effective treatment, it will cause fluorine pollution to the surrounding water environment. Excessive intake of fluoride in the human body can lead to dental fluorosis and skeletal fluorosis. Due to the adverse effects of fluorine-containing wastewater on the human body, animals and plants, the national standard requires that ...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/52C02F9/04C02F101/14
CPCC02F1/66C02F1/5236C02F1/285C02F2101/14
Inventor 张炜铭张宁黄如全贾如雪张婧玥张孝林汪林朱兆坚吕振华
Owner NANJING UNIV
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