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A ph-regulating compound agent and its application in precipitation and adsorption treatment of fluorine-containing water

A compound agent and water body technology, applied in the direction of flocculation/sedimentation water/sewage treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as high cost, substandard effluent, unsatisfactory defluoridation effect, etc. , to achieve good performance and avoid uncontrollable effects

Active Publication Date: 2022-04-29
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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  • A ph-regulating compound agent and its application in precipitation and adsorption treatment of fluorine-containing water
  • A ph-regulating compound agent and its application in precipitation and adsorption treatment of fluorine-containing water
  • A ph-regulating compound agent and its application in precipitation and adsorption treatment of fluorine-containing water

Examples

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Effect test

Embodiment 1

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

[0038] The specific processing steps are as follows:

[0039] Step 1: Preparation of pH Adjusting Compounds

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

[0041] The second step: resin adsorption treatment of fluorine-containing water

[0042] S1, at 200r·min -1 Add the above-mentioned pH-adjusting compounding agent at the stirring speed of 100 %, and continue to stir the reaction for 1 min after the addition; then reduce the stirring speed to 30 r min. -1 Continue to stir for 30min, and then settle for 20min;...

Embodiment 2

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

[0050] The specific processing steps are as follows:

[0051] Step 1: Preparation of pH Adjusting Compounds

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

[0053] The second step: resin adsorption treatment of fluorine-containing water

[0054] S1, at 200r·min -1 Add the above-mentioned pH-adjusting compounding agent at the stirring speed of 100 rpm, and continue stirring for 1 min after the addition; then reduce the stirring speed to 20 r min. -1 Continue to stir for 30min, and then settle for 20min; wherein...

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Abstract

The invention discloses a pH adjusting compound agent and its application in the precipitation and adsorption treatment of fluorine-containing water body. Iron is 10%‑15%. The above-mentioned medicines are made into liquid medicines, and added to the fluorine-containing wastewater according to a certain proportion. Through mechanical stirring, the pH of the water body is microscopically adjusted to be slightly acidic by using the defluoride agent itself, and then the supernatant is introduced into the fluoride-removing resin adsorption tower for treatment. To achieve the purpose of highly efficient fluorine removal, it has the advantages of simple preparation and dosage steps, low treatment cost, high fluoride removal rate and the like.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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