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Method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide

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 problem of unsatisfactory fluorine removal effect, low complexed fluorine generation ratio, and ineffective control and other problems, to achieve the effect of reducing the cost of fluorine removal treatment, improving the adsorption performance, and the method is simple and easy

Active Publication Date: 2014-06-18
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

[0029] Adopt the method disclosed in ZL200810226262.4 to prepare the fluorine removal adsorption material based on aluminum-based composite oxide, the specific method is as follows: use ceramsite with a particle size range of 1 mm to 4 mm as the porous loading matrix, and fill it into a columnar water purification reactor Medium; respectively prepared at a concentration of 100Kg / m 3 al 2 (SO 4 ) 3 solution and 15Kg / m 3 KOH lye. Pump Al 2 (SO 4 ) 3 The solution is pumped into the water purification reactor until the ceramsite 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 ceramsite 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 15 minutes. Repeat the above method 2 times. Make Al 2 (SO 4 ) 3 The aluminum-based composite oxi...

Embodiment 2

[0036] Adopt the method disclosed in ZL200810226262.4 to prepare the fluorine removal adsorption material based on aluminum-based composite oxide, the specific method is as follows: use bone charcoal with a particle size range of 0.5 mm to 1 mm as the porous loading matrix, and fill it into a columnar water purification reactor Medium; respectively prepared concentration of 50Kg / m 3 Polyaluminum chloride (PAC) solution and 4Kg / m 3NaOH lye. Use a pump to pump the PAC solution into the water purification reactor until the bone charcoal is submerged and stop pumping the PAC solution, and release the PAC solution after 60 minutes of immersion; then pump the KOH lye into the water purification reactor until the bone charcoal is submerged and stop Pump in the NaOH solution, let the NaOH solution flow out after soaking for 30 minutes, and let it stand for 30 minutes intermittently. Repeat the above method 3 times. The aluminum-based composite oxide prepared by the chemical reactio...

Embodiment 3

[0043] 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 invention relates to a method for removing fluoride in drinking water by complexation-coacervation-adsorption with defluorination adsorption material based on aluminium base composite metal oxide. Firstly free form fluorine in water is converted into complexation state fluorine by controlling appropriate pH value condition, aluminium salt form and throwing amount or the like; calcium hydrate and aluminium salt are introduced for realizing coacervation process and providing active adsorption sites with abundant surface hydroxies, thereby the dissolved state fluorine in water is converted into particulate type fluorine by coacervation and absorption effects; dissolved state fluorine is further removed after water flows though an absorption fixed bed reactor filled with defluorination adsorption material based on aluminium base composite metal oxide; finally, water flows through a filter reactor, and colloid, particle and other impurities contained in the absorption fixed bed reactor water outlet are removed. Fluorine in the drinking water is removed by using the method provided by the invention, and the processed water can reach the WHO, USEPA and other related standards and 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 through complexation-coagulation-adsorption of an aluminum-based composite metal oxide-based fluoride removal adsorption material. Background technique [0002] Fluoride pollution in drinking water is a problem faced by many regions in my country. 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, ease of use, and long-term operating reliability. For rural areas with low level of operation management and small scale of water supply, the adsorption method is easy to p...

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鞠佳伟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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