Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, its preparation method and application

A micro-nano reactor and selective technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the difficulties of in-situ real-time regeneration, low selectivity of ion exchangers, and difficult treatment of regeneration solution, etc. To achieve the effect of stable water output, strong selective adsorption capacity and continuous regeneration

Active Publication Date: 2022-04-15
BEIJING ORIGIN WATER FILM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of ammonia nitrogen treatment of actual municipal water polluted by low concentration ammonia nitrogen, and solve the problems of low selectivity of ion exchangers, difficult treatment of regeneration liquid, high regeneration cost and difficulty in realizing ammonia nitrogen treatment by using ion exchange method. The technical defect of in-situ real-time regeneration, providing a preparation method of visible light micro-nano reactor membrane for the selective removal of ammonia nitrogen

Method used

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  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, its preparation method and application
  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, its preparation method and application
  • Visible light micro-nano reactor membrane for selective removal of ammonia nitrogen, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of visible light micro-nano reactor film

[0043] 1. Preparation of calcium aluminosilicate hydrate as a chloride ion adsorbent

[0044] In terms of molar ratio n(Ca):n(Al):n(Si)=4:1:2 Weigh calcium nitrate, aluminum nitrate and sodium silicate, prepare calcium nitrate with a concentration of 4mol / L with deionized water respectively Solution, 1mol / L aluminum nitrate solution and 2mol / L sodium silicate solution are 500mL each, mix the three solutions and stir for 3-5h under the condition of strong mechanical stirring at a speed of 100-500rad / min, then add 1mol / L sodium hydroxide solution adjusted the pH of the reaction system to 13.5. The reaction system was sealed and placed in a constant temperature water bath, and reacted at a constant temperature at 70°C for 120 hours. The obtained precipitate was washed 5 times with deionized water, and then the solid phase obtained after suction filtration was placed in an oven and heated at 55°C. After dryi...

Embodiment 2

[0053] The actual water samples were retrieved from a municipal sewage treatment plant in Beijing, and the concentrations of ammonia nitrogen, total nitrogen, chloride ions, calcium ions and magnesium ions, and pH values ​​of the water samples were determined.

[0054] Take 500mL water sample in a 1L transparent beaker, put a visible light micro-nano reactor membrane with a diameter of 8cm prepared in Example 1 into the water sample, and observe that the visible light micro-nano reactor membrane is in a suspended state in the water.

[0055] The beaker was placed on the open and flat ground outdoors, and was irradiated by sunlight for two hours. The beaker was taken back, and the water sample was analyzed again. The results are shown in Table 1 below.

[0056] Table 1 embodiment 1 every index of water sample

[0057]

[0058] It can be seen from Table 1 that the visible light micro-nano reactor membrane has a high selective removal effect on ammonia nitrogen, and the concen...

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Abstract

The invention provides a method for preparing a visible light micro-nano reactor membrane for the selective removal of ammonia nitrogen. The amide is used as the main raw material, and the obtained mixed material solution is coated on a flat plate, and after the dimethylacetamide is transferred in water, it is taken out and dried to obtain a visible light micro-nano reactor film. The visible light micro-nano reaction membrane of the present invention can effectively realize the selective exchange of ammonium ions from the water body through the ammonium ion sieve material, cooperate with the chloride ion adsorbent visible light catalyst to realize the continuous regeneration of the ammonium ion sieve, and effectively realize the continuous operation of the membrane and stable water output , to solve the technical problems of low selectivity of conventional ion exchangers, difficult treatment of regeneration solution, high regeneration costs, and difficulty in realizing real-time regeneration in situ.

Description

【Technical field】 [0001] The invention relates to the field of membrane technology, in particular to a visible light micro-nano reactor membrane with the selective removal function of ammonia nitrogen, and relates to the method and application of the membrane. 【Background technique】 [0002] With the development of industry, the modernization of life and the non-point source pollution of agriculture, the pollution of ammonia nitrogen in surface water is increasing day by day. For the ammonia nitrogen treatment of the actual municipal water polluted by low concentration ammonia nitrogen, the treatment technologies currently used mainly include biochemical method and ion exchange method. [0003] The biggest disadvantage of the biochemical method is that the operation is unstable, the ammonia nitrogen and total nitrogen in the produced water fluctuate too much, and it is difficult to achieve efficient and stable operation. This is because the main factors affecting biological...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12
CPCC02F9/00C02F1/281C02F1/30C02F1/42C02F1/72C02F1/76C02F2305/10
Inventor 陈亦力莫恒亮李锁定俞开昌孟佳意刘曼曼薛涛李天玉
Owner BEIJING ORIGIN WATER FILM TECH
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