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Defluorination process for drinking water in mining area

A technology for drinking water and mining areas, applied in the fields of water pollutants, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of limited use, high equipment and operating costs, complex electrocoagulation and membrane processes, etc. Achieve the effect of increasing porosity and specific surface area and improving fluorine removal ability

Active Publication Date: 2021-09-07
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, ion exchange method is expensive, electrocoagulation method and membrane method are complex in process, equipment and operation cost are high, and their use is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The drinking water defluoridation process of Zhongyuan Oilfield mining area uses modified hydroxyapatite as the filter material for defluoridation. The technical solution for preparing modified hydroxyapatite used in the present invention includes the following steps:

[0013] Step 1: Accurately measure 100ml of 0.25mol / L Ca(NO 3 ) 2 4H 2 The O solution was placed in a 250ml beaker, and then 0.1g of anhydrous taste nucleotide disodium was added, stirred until dissolved, and the pH value was adjusted to be equal to 10, which was the first solution;

[0014] Step 2: Accurately measure Na with a concentration of 0.15mol / L 2 HPO 4 Pour 100ml of the solution into another 250ml beaker, and adjust the pH value to be equal to 10, which is the second solution;

[0015] Step 3: Add the second solution dropwise to the first solution at a constant temperature of 60°C under magnetic stirring to form a 200mL mixed solution. At the same time, adjust the pH value to 10, continue st...

Embodiment 2

[0017] The drinking water defluoridation process of Zhongyuan Oilfield mining area uses modified hydroxyapatite as the filter material for defluoridation. The technical solution for preparing modified hydroxyapatite used in the present invention includes the following steps:

[0018] Step 1: Accurately measure 100ml of 0.25mol / L Ca(NO 3 ) 2 4H 2 The O solution was placed in a 500ml beaker, and then 0.5g of anhydrous flavored nucleotide disodium was added, stirred until dissolved, and the pH value was adjusted to be equal to 10, which was the first solution;

[0019] Step 2: Accurately measure Na with a concentration of 0.15mol / L 2 HPO 4 Pour 100ml of the solution into a 250ml beaker, and adjust the pH value to be equal to 10, which is the second solution;

[0020] Step 3: Add the second solution dropwise to the first solution at a constant temperature of 60°C under magnetic stirring to form a 200ml mixed solution. At the same time, adjust the pH value to 10, continue stirr...

Embodiment 3

[0022] The drinking water defluoridation process of Zhongyuan Oilfield mining area uses modified hydroxyapatite as the filter material for defluoridation. The technical solution for preparing modified hydroxyapatite used in the present invention includes the following steps:

[0023] Step 1: Accurately measure 100ml of 0.25mol / L Ca(NO 3 ) 2 4H 2 O solution is placed in a 500ml beaker, then add 1g of anhydrous taste nucleotide disodium, stir until dissolved, and adjust the pH value to be equal to 10, which is the first solution;

[0024] Step 2: Accurately measure Na with a concentration of 0.15mol / L 2 HPO 4 Pour 100ml of the solution into a 250ml beaker, and adjust the pH value to be equal to 10, which is the second solution;

[0025] Step 3: Add the second solution dropwise to the first solution at a constant temperature of 60°C under magnetic stirring to form a 200ml mixed solution. At the same time, adjust the pH value to 10, continue stirring for 2 hours, and adjust th...

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PUM

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Abstract

The invention provides a process for defluorinating drinking water of a mining area by using modified hydroxyapatite. After hydroxyapatite is modified by the disodium 5'-ribonucleotide, phosphate radicals in the disodium 5'-ribonucleotide and Ca<2+> in the hydroxyapatite form chemical bonds, so that crystal lattices of the hydroxyapatite generate defects, and the crystallinity is reduced; and meanwhile, gaps of the hydroxyapatite are increased by other parts of the disodium 5'-ribonucleotide molecules, and the porosity and the specific surface area of the hydroxyapatite are increased. Therefore, the defluorination capability is improved.

Description

technical field [0001] The invention relates to the technical field of defluorination of drinking water, in particular to a process technology applicable to groundwater defluorination in a specific area. Background technique [0002] At present, the defluoridation process at home and abroad mainly includes adsorption method, electrocoagulation method, membrane method (reverse osmosis, nanofiltration, electrodialysis), ion exchange method, chemical precipitation method, coagulation precipitation method and so on. Among these methods, the ion exchange method is expensive, and the electrocoagulation method and membrane method are complicated in process, high in equipment and operating costs, and their use is limited. Chemical precipitation and coagulation precipitation are more suitable for the treatment of high-concentration fluoride-containing water, which are generally not used for drinking water. The adsorption method is widely used at home and abroad because of its simple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/14
CPCB01J20/223C02F1/285C02F2101/14
Inventor 赵建东尚德彬黄巍
Owner 中石化石油工程技术服务有限公司
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