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A method for simultaneously removing arsenic and fluorine from groundwater

A technology for removing water and iron hydrate, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of weak arsenic and fluorine removal capabilities, unfavorable applications, and adsorbent dosage High-level problems, to achieve the effect of excellent pollution removal efficiency, low operating cost, and broad-spectrum adaptability

Inactive Publication Date: 2011-12-28
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this material is complicated, the cost is expensive, and an external magnetic field is often required to achieve solid-liquid separation, which makes it difficult to apply in engineering practice.
The attapulgite defluoridation agent (patent application number: CN200510040604.X) invented by Xu Qinghua et al. has low material preparation cost, but the ability to remove arsenic and fluoride is weak, the dosage of adsorbent is high, and complex flocculation, precipitation, and clarification are required. Filtration and other units realize solid-liquid separation, which is not conducive to the application in rural decentralized defluoridation projects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In this example, the arsenic and fluorine coexistence polluted water contains 0.1 mg / L arsenic and 2.0 mg / L fluorine.

[0046] Prepare a mixed solution of iron salt and aluminum salt, wherein the iron salt is ferric chloride, the aluminum salt is aluminum sulfate, and the ratio of the moles of the iron salt to the moles of the aluminum salt is 0.5:1. The ratio of the number of moles of aluminum salt in the mixed solution to the number of moles of arsenic in the polluted water where arsenic and fluorine coexist is 100:1, and the ratio of the number of moles of aluminum salt in the hydrated iron-aluminum hydroxide to the number of moles of fluoride ions in the polluted water where arsenic and fluorine coexist is 100:1. The ratio is 5:1.

[0047] Preparation of sodium hydroxide solution, hydroxide ions (OH - ) to the sum of the moles of iron and aluminum in the hydrated iron-aluminum hydroxide is 0.05:1.

[0048] Add the mixed solution of iron salt and aluminum salt into...

Embodiment 2

[0051] In this example, the arsenic and fluorine coexistence polluted water contains 0.1 mg / L arsenic and 2.0 mg / L fluorine.

[0052] Prepare a mixed solution of iron salt and aluminum salt, wherein the iron salt is ferric chloride, the aluminum salt is aluminum sulfate, and the ratio of the moles of the iron salt to the moles of the aluminum salt is 1:10. The ratio of the number of moles of aluminum salt in the mixed solution to the number of moles of arsenic in the polluted water where arsenic and fluorine coexist is 200:1, and the ratio of the number of moles of aluminum salt in the hydrated iron-aluminum hydroxide to the number of moles of fluoride ions in the polluted water where arsenic and fluorine coexist is 200:1. The ratio is 25:1.

[0053] Prepare a mixed solution of sodium hydroxide and sodium silicate, hydroxide ions (OH - ) and the ratio of the sum of the moles of iron and the moles of aluminum in the hydrated iron aluminum hydroxide is 5:1.

[0054] Add the mi...

Embodiment 3

[0057] In this example, the arsenic and fluorine coexistence polluted water contains 0.2 mg / L arsenic and 1.5 mg / L fluorine.

[0058] Prepare a mixed solution of iron salt and aluminum salt, wherein the iron salt is ferric chloride, the aluminum salt is aluminum sulfate, and the ratio of the moles of the iron salt to the moles of the aluminum salt is 1:1. The ratio of the number of moles of aluminum salt in the mixed solution to the number of moles of arsenic in the polluted water where arsenic and fluorine coexist is 20:1, and the ratio of the number of moles of aluminum salt in the hydrated iron-aluminum hydroxide to the number of moles of fluoride ions in the polluted water where arsenic and fluorine coexist The ratio is 10:1.

[0059] Prepare a mixed solution of sodium hydroxide and calcium hydroxide, hydroxide ions (OH - ) and the ratio of the sum of the moles of iron and the moles of aluminum in the hydrated iron aluminum hydroxide is 1:1.

[0060] Add the iron salt in...

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Abstract

The invention belongs to the technical field of removing arsenic and fluorine in underground water polluted by the coexistence of arsenic and fluorine, and in particular relates to an application method for adsorbing arsenic and fluorine with hydrated iron-aluminum hydroxide, especially the application in removing arsenic and fluorine from drinking water in rural areas. The invention provides a method for converting dissolved arsenic and fluorine into granular arsenic and fluorine by using hydrated iron-aluminum hydroxide and removing the granular arsenic and fluorine from water, and an integrated reactor for realizing the above-mentioned process. The method provided by the invention can be used to remove arsenic and fluorine in drinking water, underground water and industrial waste water. In addition, the method can also remove heavy metals such as mercury, lead, zinc, copper and cadmium in water.

Description

technical field [0001] The invention relates to a treatment method for arsenic and fluorine in groundwater, in particular to a treatment method for simultaneously removing arsenic and fluorine. Background technique [0002] The arsenic and fluorine pollution of drinking water and its water quality health risks have aroused widespread concern at home and abroad. Drinking high-arsenic water for a long time can cause a series of health problems such as melanosis, keratosis and cancer. Long-term drinking high-fluorine water can lead to dental plaque and fluorosis. my country is one of the typical countries suffering from arsenic and fluorine pollution at the same time. Due to environmental geochemical factors, groundwater in many areas shows obvious characteristics of coexistence of arsenic and fluorine pollution, and the potential synergistic toxic effect between the two may lead to an abnormal increase in the incidence of endemic diseases in some areas. my country's current ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 曲久辉刘锐平王洪杰兰华春巩文信吴鹍杨天明
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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