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Method for accelerating solid-liquid separation of nanometer particle suspension

A nanoparticle and solid-liquid separation technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of nanomaterials that are difficult to settle, affect the quality of effluent water, and low separation efficiency, so as to reduce the turbidity of effluent water, ensure the quality of effluent water, Simple operation effect

Inactive Publication Date: 2013-08-07
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to solve the problem that nanomaterials are difficult to settle in wastewater treatment and affect the quality of effluent water, and to overcome the shortcomings of existing patents such as low separation efficiency of non-magnetic materials, and to provide a method for accelerating the solid-liquid separation of nanoparticle suspensions

Method used

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  • Method for accelerating solid-liquid separation of nanometer particle suspension
  • Method for accelerating solid-liquid separation of nanometer particle suspension
  • Method for accelerating solid-liquid separation of nanometer particle suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Access to N 2 Under these conditions, iron nanoparticles were mixed with deionized water, APAM and NPAM with a molecular weight of about 4 million to 5 million in three beakers, and the reaction concentrations of iron nanoparticles, APAM and NPAM were 2 g / L and 0.02 g / L. L, 0.02 g / L, with a G value of 800 s -1 Stir for 20 s, then use G value for 50 s -1 Stir for 5 min. After the stirring is completed, take 50 mL of the mixture in three 50 mL graduated cylinders and let it settle for 20 min. The results showed (Table 1) that after 1 h of reaction, the turbidity of the effluent without flocculant PAM was 21 times and 13 times higher than that of NPAM and APAM respectively.

[0026] Table 1. Comparison of sedimentation effect and supernatant turbidity in three groups of experiments in Example 1

[0027]

Embodiment 2

[0029] Such as figure 2 As shown in the process flow, feed water 1 and nanometer zero-valent iron 2 enter the reaction zone 4 from the same side of the reaction zone 4, and PAM is added to the upper part of the reaction zone 4 through a metering pump; the outlet of the other side of the reaction zone 4 is connected to the precipitation zone 5 One side of the sedimentation zone 5 is the water outlet 6; the bottom of the reaction zone 4 is the outlet of the remaining sludge 7, part of the sludge at the bottom of the sedimentation zone 5 returns the return sludge 8 to the bottom of the reaction zone 4 through the pipeline, and the other part of the sludge at the bottom of the sedimentation zone 5 Mud connects the remaining sludge 7 outlets. The continuous flow test was carried out in the small test device of the closed continuous nano-iron particle reactor. The nano-iron particles reacted with the copper smelting wastewater of a factory in the reaction zone. The concentration of...

Embodiment 3

[0031] Access to N 2 Under the conditions, the nano-iron particles were reacted with a copper mine smelting wastewater in a conical flask. The concentration of copper ions in the wastewater was 50 mg / L, the concentration of nano-iron particles was 500 mg / L, and the G value was 80 s -1 . After reacting for one hour, take 50ml of the mixed solution in three beakers, and then add a small amount of equal volume of APAM solution, NPAM solution and deionized water respectively. The reaction concentrations of APAM and NPAM are both 5 mg / L. In access N 2 Under the condition, the G value is 800 s -1 Stir for 20 s, then set at a G value of 800 s -1 Stir for 5 min. After the stirring is completed, take 50 mL of the mixture in three 50 mL graduated cylinders and let it settle for 20 min. The supernatant was taken at the same height at the same interval, and the copper concentration in it was measured with an inductively coupled plasma emission spectrometer (ICP-Agilent720ES). The res...

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Abstract

The invention relates to a method for accelerating the solid-liquid separation of a nanometer particle suspension, and belongs to the technical field of wastewater treatment. The invention provides the method for accelerating the solid-liquid separation of the nanometer particle suspension for solving the problems that the nanometer particle after a nanometer material is applied to treating wastewater is difficult to settle and therefore the quality of treated water is influenced. An organic polymer flocculant polyacrylamide (PAM with the molecular formula C3xH5xNxOx) is fed into the nanometer particle suspension; under the actions of adsorption bridging, weep flocculation and the like of the PAM, the nanometer particle and the PAM are subjected to mixing and flocculation steps to form a floc which is large in particle size and easy to settle so as to accelerate the settlement of the nanometer particle; solid-liquid separation is achieved under the action of gravity; nanometer particle residue amount in supernatant fluid is reduced; the turbidity of the treated water is significantly reduced; and the quality of the treated water is ensured. The separation method provided by the invention is simple in operation, low in cost, and suitable for the solid-liquid separation of the nanometer particle containing suspension, such as the suspension generated when the nanometer material is applied to treating water pollution.

Description

technical field [0001] The invention relates to a method for accelerating the solid-liquid separation of a nanoparticle suspension, belonging to the technical field of wastewater treatment, specifically adding an organic polymer flocculant PAM to accelerate the solid-liquid separation of a nanoparticle suspension and improving the quality of nanomaterial-treated water. Background technique [0002] Nanomaterials are one of the materials with the greatest development potential in this century. Due to their remarkable effect on the removal of heavy metals, organic halides and other pollutants in water, they have been widely used in environmental sewage treatment, municipal solid waste treatment, air purification, etc. in recent years. field. However, the potential hazards of nanomaterials have gradually attracted people's attention, such as their biological toxicity has become a research hotspot. In view of the biological toxicity of nanomaterials and the potential risks caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 张伟贤李少林雷轰夏薇
Owner TONGJI UNIV
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