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Method for removing fluorides in water based on complexation-condensation-adsorption combination

An adsorption process, fluoride technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problem of low formation ratio of complexed fluorine, ineffective control, unsatisfactory defluoridation effect, etc. problems, to achieve the effect of easy realization, simple method, and improvement of fluorine removal effect

Active Publication Date: 2014-05-07
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

Therefore, although there may be a certain degree of aluminum-fluorine complexation reaction in the coagulation defluorination process, the formation ratio of complexed fluorine is still low and not effectively controlled, so the defluorination effect is still not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First use hydrochloric acid to adjust the pH value of the water to be treated with a fluorine concentration greater than 1 mg / L to 5.5, then add an aqueous solution of polyaluminum chloride with an aluminum salt polymerization degree of 8 to 16, and put it in a hydraulic mixing reactor Fully react for 1 minute, so that the free fluorine in the fluorine-containing water to be treated is converted into complex fluorine; wherein: the molar ratio of polyaluminium chloride with an aluminum salt polymerization degree of 8 to 16 to the fluorine in the fluorine-containing water to be treated is 1: 1;

[0024] (2) Add calcium hydroxide suspended aqueous solution and polyaluminum chloride aqueous solution with aluminum salt polymerization degree of 8 to 16 to the effluent water of the hydraulic mixing reactor whose pH value is 5.5 after the reaction in step (1), and mechanically Fully react in the mixing reactor for 30 minutes; wherein: the molar ratio of the added aluminum s...

Embodiment 2

[0028] (1) First use sodium hydroxide to adjust the pH of the water with a fluorine concentration greater than 1mg / L to 7.2, then add an aqueous solution of aluminum sulfate, and fully react in a hydraulic mixing reactor for 60 minutes; make the fluorine-containing water to be treated The free fluorine is converted into complex fluorine; wherein: the molar ratio of aluminum sulfate to fluorine in the fluorine-containing water to be treated is 0.1:1;

[0029] (2) Add calcium hydroxide suspended aqueous solution and polyaluminum chloride aqueous solution with aluminum salt polymerization degree of 8 to 16 to the effluent water of the hydraulic mixing reactor with a pH value of 7.2 after the reaction in step (1), and Fully react in the mixing reactor for 30 minutes; wherein: the molar ratio of the added aluminum salt with a polymerization degree of 8 to 16 to the fluorine in water is 1.9:1 (that is, the aluminum sulfate added in step (1) and the step (2) The molar ratio of the to...

Embodiment 3

[0033] (1) First use sulfuric acid to adjust the pH value of the water to be treated with a fluorine concentration greater than 1 mg / L to 5, then add an aqueous solution of polyaluminum sulfate with a polymerization degree of aluminum salt of 30, and fully react in the aeration mixing reactor For 10 minutes, the free fluorine in the fluorine-containing water to be treated is converted into complex fluorine; wherein: the molar ratio of polyaluminum sulfate with an aluminum salt polymerization degree of 30 to the fluorine in the fluorine-containing water to be treated is 1:1;

[0034] (2) Add calcium hydroxide suspension aqueous solution and aluminum chloride aqueous solution to the effluent water of the aeration mixing reactor whose pH value is 5 after the reaction in step (1), and fully react in the mechanical mixing reactor for 30 minutes; Among them: the molar ratio of the added aluminum chloride to the fluorine in the water is 14:1 (that is, the total amount of the polyalumi...

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Abstract

The invention relates to a drinking water treatment method and especially relates to a method for removing fluorides in water based on complexation-condensation-adsorption combination. The method comprises the following steps of 1, transforming free fluorine in water into a fluorine complex by control of an appropriate pH value, an aluminum salt form and an aluminum salt use amount, 2, further introducing appropriate amounts of calcium hydrate and an aluminum salt to improve a pH value so that condensation is realized; active adsorption points rich in surface hydroxyl are provided; and through condensation and adsorption, fluorine (comprising the free fluorine and the fluorine complex) dissolved in the water is transformed into fluorine particles (comprising condensed fluorine and adsorbed fluorine), and 3, removing the fluorine particles in the water by a solid-liquid separation reactor so that removal of fluorine in the water is realized. The method realizes removal of fluorine in drinking water, and has water treatment capacity satisfying WHO and USEPA standards and the lasted 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 synergistically removing fluoride in drinking water based on complexation-coagulation-adsorption processes. Background technique [0002] Fluoride pollution in drinking water is a problem faced by many regions in my country. 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. Drinking water defluoridation technology mainly includes activated alumina adsorption, electrodialysis, bone charcoal adsorption filtration, ion exchange resin bed filtration, aluminum salt coagulation method, lime-phosphate co-precipitation method and membrane filtration. Various technical methods have different advantages and disadvantages and use conditions, and there are also differences in operating costs, ...

Claims

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Application Information

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