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Method for removing fluorides in water through aluminum base composite metal oxide-based fluorine removing absorption material complexation-absorption

An aluminum-based composite and adsorption material technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problems of aluminum dissolution risk, shortened adsorption cycle, and reduced adsorption capacity, etc., to achieve excellent Adsorption and defluorination performance, reduced operating costs, and improved adsorption performance

Active Publication Date: 2014-07-09
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, activated alumina has the following disadvantages in the application process: low adsorption capacity leads to frequent regeneration, slow adsorption rate requires high empty bed residence time (EBCT), which leads to excessive reactor size and high engineering investment , the adsorption performance is greatly affected by the pH value, the adsorption capacity decreases after regeneration, the adsorption cycle is greatly shortened, and there is a risk of aluminum dissolution, etc.
In order to solve the above problems, many studies have proposed the modification of other metal oxides such as iron oxide, manganese oxide, magnesium oxide, copper oxide, lanthanum oxide, and cerium oxide, but there are problems such as complicated preparation process and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method disclosed in ZL200810226262.4 was used to prepare the fluorine removal adsorption material based on aluminum-based composite oxide. The specific method is as follows: use anthracite with a particle size range of 0.5 mm to 1.0 mm as the porous loading matrix, and fill it into a columnar water purification reaction In the device; respectively prepare the concentration of 12Kg / m 3 Al 2 (SO 4 ) 3 solution and 2.5Kg / m 3 NaOH lye. pump Al 2 (SO 4 ) 3 The solution is pumped into the water purification reactor until the anthracite is submerged and the pumping of Al is stopped 2 (SO 4 ) 3 solution, the Al 2 (SO 4 ) 3 The solution is released; then pump the KOH lye into the water purification reactor until the anthracite is submerged and stop pumping the NaOH solution. After 20 minutes of immersion, the NaOH solution flows out, and it is allowed to stand intermittently for 60 minutes. Repeat the above method 3 times. Make Al 2 (SO 4 ) 3 The aluminum-ba...

Embodiment 2

[0027] The method disclosed in ZL200810226262.4 is used to prepare the fluorine removal adsorption material based on aluminum-based composite oxide. In the device; respectively prepare the concentration of 50Kg / m 3 Al 2 (SO 4 ) 3 Solution and 5Kg / m 3 NaOH lye. pump Al 2 (SO 4 ) 3 The solution was pumped into the reactor until the diatomaceous earth was submerged and the pumping of Al was stopped 2 (SO 4 ) 3 solution, the Al 2 (SO 4 ) 3 Release the solution; pump the NaOH lye into the reactor until the diatomaceous earth is submerged and stop pumping the NaOH solution, let the NaOH solution flow out after 30 minutes of immersion, and let it stand for 30 minutes intermittently. Repeat the above method 3 times. Make Al 2 (SO 4 ) 3 The aluminum-based composite oxide prepared by the chemical reaction of the solution and the NaOH solution is loaded on the surface of the diatomite in situ, and the fluorine-removing adsorption material based on the aluminum-based comp...

Embodiment 3

[0032] The method disclosed in ZL200810226262.4 is used to prepare the fluorine removal adsorption material based on aluminum-based composite oxides. The specific method is as follows: use magnetite with a particle size range of 0.8 mm to 2.0 mm as the porous loading matrix, and fill it into a columnar reaction In the device; respectively prepare the concentration of 100Kg / m 3 AlCl 3 solution and 10Kg / m 3 NaOH lye. pump AlCl 3 The solution is pumped into the column reactor until the magnetite is submerged and the pumping of AlCl is stopped 3 solution, AlCl after 60 minutes of immersion 3 The solution is released; pump the NaOH lye into the columnar reactor until the magnetite is submerged and stop pumping the NaOH solution. After 30 minutes of immersion, the NaOH solution flows out, and it is allowed to stand intermittently for 30 minutes. Repeat the above method 3 times. Make AlCl 3 The aluminum-based composite oxide prepared by the chemical reaction between the soluti...

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Abstract

The present invention relates to a drinking water treatment method, particularly to a method for removing fluorides in water through aluminum base composite metal oxide-based fluorine removing absorption material complexation-absorption. According to the present invention, under a certain pH value condition, an aluminum salt is poured to fluorine-containing water to convert free state fluorine ions into complexation state fluorine with various forms, and after the free state fluorine is converted into the complexation state fluorine, the obtained complexation state fluorine flows through an absorption fixed bed reactor filled with an aluminum base composite oxide-based fluorine removing absorption material so as to remove fluorine in the water; and with application of the in situ supported fluorine removing absorption agent to remove fluorides in drinking water, the treated water can achieve WHO and USEPA related standards and the latest national drinking water standard (GB5749-2006).

Description

technical field [0001] The invention relates to a treatment method for drinking water, in particular to a method for removing fluoride in drinking water by complexation-adsorption of an aluminum-based composite metal oxide-based fluorine removal adsorption material. Background technique [0002] According to incomplete statistics, the population with excessive fluoride in drinking water in my country is nearly 100 million, and the population with obvious symptoms of fluorosis (such as dental fluorosis) exceeds 35 million. Fluorine removal and control technology in drinking water is a hot and difficult issue in domestic and foreign research. The commonly used defluoridation technologies at home and abroad mainly include activated alumina adsorption, electrodialysis, bone charcoal adsorption filtration, ion exchange resin bed filtration, aluminum salt coagulation precipitation method and membrane filtration. Various technical methods have different advantages and disadvantage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/14
Inventor 刘锐平曲久辉刘会娟兰华春巩文信朱利军
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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