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Method for preparing silver nanoparticles by biological reduction of activated sludge

A technology of silver nanoparticles and activated sludge, applied in the direction of sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of death, little research on activated sludge, cell inactivation, etc., and achieve The effect of simple process

Inactive Publication Date: 2015-09-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, it is generally recognized that nano-silver with a smaller particle size passes through the cell membrane and aggregates or changes the permeability of the cell membrane or destroys the cell membrane by changing the enzyme activity, resulting in cell inactivation and death.
(Okkyoung Choi, Kathy Kanjun Deng, Nam-Jung Kim, Louis Ross Jr., Rao Y. Surampalli, Zhiqiang Hu.J. Water Research, 42(2008): 3066–3074.) Early studies focused on the effect of nano silver on pure bacteria effects of culture, but relatively complex microbial environments such as activated sludge are rarely studied

Method used

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  • Method for preparing silver nanoparticles by biological reduction of activated sludge
  • Method for preparing silver nanoparticles by biological reduction of activated sludge
  • Method for preparing silver nanoparticles by biological reduction of activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A certain volume of 5mg / L silver nitrate wastewater is prepared, and the peristaltic pump enters the II activated sludge reactor at a water inflow rate of 0.5L-2L / min, and the reactor is aerated by an air compressor to degrade the wastewater substances and measure Activated sludge characteristic indicators such as COD, ammonia nitrogen and effluent MLSS, MLVSS, SV, SVI, and extracellular polymers in different degradation times. The presence of nano-silver was verified by ultraviolet-visible absorption spectroscopy (UV-Vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and XPS. in Figure 4 (a) is the SEM image and transmission electron microscope of silver nanoparticles obtained by reduction of silver nitrate. figure 2 , the valence analysis XPS of elemental silver see Figure 6~7 .

Embodiment 2

[0030] Add 5mg / L silver chloride activated active sludge to treat sewage according to the same steps as in Example 1, process according to the same reactor operating conditions in Example 1, measure COD, ammonia nitrogen and effluent MLSS, MLVSS, SV, SVI, extracellular polymers and other activated sludge characteristic indicators. Figure 5 (a) shows the scanning electron microscope picture of silver chloride being reduced to granular silver in the activated sludge reactor, and further through the transmission electron microscope image 3 The particle size of the nano-silver particles obtained by analysis, and Figure 8-9 XPS confirmed the presence of zero-valent silver.

Embodiment 3

[0032] Add the activated sludge degraded waste water material of 50mg / L silver nitrate according to the same step of embodiment 1, process according to the same reactor operating conditions of embodiment 1, measure COD, ammonia nitrogen and effluent MLSS, MLVSS, SV, SVI of water body in different degradation time , extracellular polymers and other activated sludge characteristic indicators. pass Figure 4 (b) scanning electron microscope (SEM), Figure 6~7 The XPS analysis verified the presence of nanosilver.

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Abstract

The invention relates to silver nanoparticles, particularly a method for preparing silver nanoparticles by biological reduction of activated sludge, which comprises the following steps: 1) carrying out wastewater acclimatization treatment on sewage plant sludge, wherein the wastewater adopts prepared simulated wastewater, the carbon source in the simulated wastewater is glucose, the nitrogen source is ammonium nitride, the phosphorus source is potassium dihydrogen phosphate, the simulated wastewater is added according to the mass concentration of ammonia nitrogen of 50-300 mg / L, and the C:N:P ratio is 100:5:1; 2) adding silver nitrate into a sodium chloride solution to obtain a silver chloride sol; and 3) respectively adding the silver nitrate solution and silver chloride sol into a water storage tank, introducing by a peristaltic pump 4 into an activated sludge reactor 3, carrying out aeration treatment on an aeration pipe 6 arranged in the activated sludge reactor 3 by using an air compressor 5 to degrade wastewater substances, and reducing to obtain the silver nanoparticles. The method has the advantages of simple and understandable technical process and no need of complex route design, obtains the high-added-value silver nanoparticles, is a new attempt for treating silver-containing wastewater, and can provide references for subsequent research.

Description

technical field [0001] The invention relates to silver nanoparticles, in particular to a method for preparing silver nanoparticles by biological reduction of activated sludge. Background technique [0002] With the rapid development of industrial production technology, the application of nanomaterials is becoming more and more extensive and in-depth. Silver is a well-known precious metal, and nano-silver and its mixture are attracting more and more attention. (Maynard, A.D., Michelson, E., 2006. The Nanotechnology Consumer Product Inventory. http: / / www.nanotechproject.org / 44S) Silver and its related products are widely used in electroplating, photosensitive materials, chemical industry, electronics, scientific research and other fields . Due to the outstanding ability of nano-silver to inhibit microbial activity, its importance is more prominent in the textile industry, cosmetics, medical treatment, food, daily necessities (clothes, gauze, paint, food packaging), biomedici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12B22F9/24
CPCY02W10/10
Inventor 王海涛洪亚敏王远鹏李清彪
Owner XIAMEN UNIV