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Method for removing heavy metals by using waste aluminium base compound oxide-based fluoride-removing adsorbing material

An aluminum-based composite and adsorption material technology is applied in the field of water treatment, which can solve the problems of insufficient utilization of surface adsorption sites, and achieve the effects of realizing waste recycling, simple and easy process methods, and reducing treatment costs.

Inactive Publication Date: 2015-11-25
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

[0003] When the fluorine removal adsorption material based on aluminum-based composite oxide is applied, since the drinking water standard requires high fluorine concentration in the effluent, it needs to be regenerated when the equilibrium concentration is 1 mg / L. Therefore, the fluorine removal adsorption material based on aluminum-based composite oxide The material still has a large number of surface adsorption sites that are not fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Place the discarded aluminum-based composite oxide-based fluoride-removing adsorbent in a immersion tank, add a sulfuric acid solution with pH=0.2 to the soaker tank, and the volume of the sulfuric acid solution is equal to Twice the bulk volume; react for 30 minutes under mechanical stirring conditions.

[0026] Stop stirring and let it stand for 2 hours; skim the supernatant from the soaking tank to the recovery tank to remove the remaining solid impurities in the soaking tank. Add sodium hydroxide lye to the recovery tank under hydraulic stirring to make the pH value of the solution reach 4, and react for 5 minutes.

[0027] Add the suspension in the recovery tank to the arsenic-containing wastewater to be treated, and fully react in the aeration mixing reactor for 1 minute; the dosage of the suspension is such that the total amount of iron salt and aluminum salt added The molar ratio of arsenic to water is 2:1. The solid-liquid separation method of sedimentation a...

Embodiment 2

[0029]Place the discarded aluminum-based composite oxide-based fluoride-removing adsorbent in a immersion tank, and add a nitric acid solution with pH=1 to the immersion tank. 3 times the stack volume; react for 2h under hydraulic stirring conditions.

[0030] Stop stirring and let it stand for 4 hours; skim the supernatant from the soaking tank to the recovery tank to remove the remaining solid impurities in the soaking tank. Add potassium hydroxide lye to the recovery tank under mechanical stirring to make the pH value of the solution reach 5, and react for 10 minutes.

[0031] Add the suspension in the recovery pool to the cadmium-containing wastewater to be treated, and fully react in the hydraulic mixing reactor for 10 minutes; the dosage of the suspension is such that the total dosage of the iron salt and aluminum salt added The molar ratio of cadmium to water is 10:1. The solid-liquid separation method of clarification and medium filtration is used to separate the sus...

Embodiment 3

[0033] Place the discarded aluminum-based composite oxide-based fluoride-removing adsorbent in a immersion tank, and add a hydrochloric acid solution with pH=2 to the immersion tank. 4 times the heap volume; react for 10h under air stirring conditions.

[0034] Stop stirring and let it stand for 10 hours; skim the supernatant of the soaking tank to the recovery tank to remove the remaining solid impurities in the soaking tank. Add calcium hydroxide lye to the recovery tank under air stirring to make the pH of the solution reach 6, and react for 20 minutes.

[0035] Add the suspension in the recovery pool to the chromium-containing wastewater to be treated, and fully react in the mechanical mixing reactor for 20 minutes; the dosage of the suspension is such that the total dosage of the iron salt and aluminum salt added The molar ratio of cadmium to water is 20:1. The solid-liquid separation method of membrane filtration is used to separate the suspended matter from the water ...

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Abstract

The invention relates to a method for removing heavy metals by using a waste aluminium base compound oxide-based fluoride-removing adsorbing material. The method provided by the invention comprises: firstly soaking a material by an acid solution and dissolving active ingredients of the material in water, then removing matrix-loading particles in the aluminium base compound oxide-based fluoride-removing adsorbing material so as to obtain a mixed solution comprising aluminium salt, ferric salt, calcium salt, magnesium salt, manganous salt and fluoride; dropwise adding alkaline liquor into the mixed solution to form suspended particles such as hydrated aluminium hydroxide, hydrated ferric hydroxide, hydrated ferric and aluminum compound hydroxide and the like; and inputting a turbid liquid into to-be-treated water comprising heavy metals and carrying out a reaction in a full stirring condition and controlling the balanced pH value after reaction so as to remove heavy metals in water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a method for removing heavy metals in water by using waste adsorbent after fluorine removal. Background technique [0002] Fluoride pollution in drinking water is a problem faced by many regions in my country. The adsorption method is easy to popularize and apply because of its advantages of no complicated dosing process and simple operation and management. It is especially suitable for low-level operation management and large-scale water supply. smaller rural areas. Fluoride removal by adsorption method mainly removes fluoride in water through physical adsorption, chemical adsorption or ion exchange on the surface of the adsorbent. Aiming at the problem of defluoridation of drinking water and the construction of an adsorption interface with a rich specific surface area, the inventors of this case invented a defluoridation adsorption material based on aluminum-based compo...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62
Inventor 刘锐平鞠佳伟兰华春刘会娟曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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