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Method for removing nano-silver in water

A nano-silver and water body technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., to achieve the effect of improving removal effect, convenient operation, and promoting agglomeration and precipitation

Active Publication Date: 2016-05-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no water treatment process or method specifically for the removal of nano-silver

Method used

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  • Method for removing nano-silver in water
  • Method for removing nano-silver in water
  • Method for removing nano-silver in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for removing nano silver in water body of the present invention, comprises the following steps:

[0030] (1) Preparation of Phanerochaete chrysosporium biofilm:

[0031] After 2 days of culture, Phanerochaete chrysosporium was grown on the quartz sand filter material, and domesticated with water samples containing nano-silver (the concentration of nano-silver in the water sample containing nano-silver can be 0.5mg / L~2mg / L) After 24 hours, a Phanerochaete chrysosporium biofilm was obtained with a thickness of 2 cm.

[0032] (2) Mix the sodium sulfide solution with the nano-silver-containing water to obtain a mixed solution, wherein the initial concentrations of sodium sulfide in the mixed solution are 0, 0.2mg / L, 1mg / L, 5.0mg / L, 10.0mg / L, 20.0mg / L, 50.0mg / L, 100.0mg / L, the initial concentration of nano-silver is 2mg / L.

[0033] (3) React the mixed solution obtained in step (2) for 120 minutes to agglomerate and precipitate nano-silver, and filter through the P...

Embodiment 2

[0042] A method for removing nano-silver in a water body of the present invention, compared with Example 1, the only difference is that the nano-silver in the water body containing nano-silver of Example 2 exists in the form of sodium citrate-nano-silver.

[0043] figure 1 It is the effect diagram of different sodium sulfide concentrations on the agglomeration of nano-silver. like figure 1 As shown, sodium sulfide can promote the agglomeration and precipitation of sodium citrate-nano-silver, so that the size of sodium citrate-nano-silver becomes larger; at the same time, with Na 2 With the increase of S concentration, the aggregation degree of sodium citrate-nano-silver increases, which can promote the biofilm method to achieve better treatment effect.

[0044] figure 2 It is the removal effect diagram of nano-silver when the concentration of sodium sulfide in the mixed solution is 1.0mg / L. like figure 2 As shown, when no sodium sulfide was added, the removal rate of so...

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Abstract

The invention discloses a method for removing nano-silver in water. The method comprises steps as follows: an inorganic sulfide solution is mixed with nano-silver-containing water, and a mixed solution is obtained; the mixed solution after reaction is filtered by a biological membrane, and treatment of the nano-silver-containing water is finished. The method has the advantages that the operation is simple, utilized reagents are simple and available, the application is wide, the practicability is high, the removing effect is good and the like.

Description

technical field [0001] The invention relates to a method for removing nano-silver in water, in particular to a method for using inorganic sulfide to promote biofilm to remove nano-silver in water. Background technique [0002] NanoSilver (NanoSilver) is a simple substance of metallic silver with a particle size of nanometer scale. The particle size of nano-silver is mostly around 25 nanometers. Because it has a strong inhibitory and killing effect on dozens of pathogenic microorganisms such as E. coli, Neisseria gonorrhoeae, and Chlamydia trachomatis, and it will not produce drug resistance, in reality is widely used. However, due to the widespread use of nano-silver, it enters water bodies in large quantities, which increases the requirements for water treatment. [0003] Existing water treatment technologies mainly target heavy metals, organic matter, and harmful microorganisms. For large particles, it is mainly removed by sedimentation, while nano-silver is difficult t...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/5236C02F3/00
Inventor 郭志陈桂秋曾光明郭行磐黄真真何凯胡亮易峰刘灵芝
Owner HUNAN UNIV
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