Composite paramagnetic nano flocculant and preparation method thereof

A paramagnetic nano and flocculant technology, which is applied in the fields of flocculation/sedimentation water/sewage treatment, magnetic field/electric field water/sewage treatment, etc. Complete and other problems, to achieve good flocculation effect, reduce interaction, and strengthen the effect of bonding

Inactive Publication Date: 2009-05-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing flocculants include inorganic flocculants, organic flocculants, microbial flocculants, and inorganic and organic polymer flocculants, all of which have unstable treatment effects, large dosage, large sludge output, difficult recycling, and self-response of the control system. The degree is poor, resulting in serious waste of flocculants, incomplete, easy to cause secondary pollution and other problems
Therefore, for different wastewater, determining a high-efficiency flocculant is a basic way to solve the problems of high cost of wastewater treatment chemicals and large sludge production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of Composite Paramagnetic Nano Flocculant

[0016] (1) γ-Fe 2 o 3 -SiO 2 Preparation of the complex: Ethyl orthosilicate (analytically pure), absolute ethanol (analytical pure), and deionized water were prepared into a solution, and according to Fe 2 o 3 with (Fe 2 o 3 +SiO2 2 ) molar ratio range of 0.070 ~ 0.450, 10gFe (NO 3 ) 3 9H 2 O (analytical pure) was dissolved in the solution, stirred for 1 hour, and the pH value of the solution was controlled at about 0.75 to obtain a relatively stable sol, which was naturally gelled in the air, and the obtained gel was slowly heated to 110°C in an oven to obtain a dry sol. gel. After grinding, they were calcined at different temperatures (350-900°C) for 30 minutes to obtain Fe 2 o 3 -SiO 2 Complex.

[0017] (2) SiO 2 / (γ-Fe 2 o 3 -SiO 2 ) preparation: add 1.0 g of the above composite particles into 40 mL of absolute ethanol and ultrasonically treat for 30 min, add 20 mL of tetraethyl orthosilicate...

Embodiment 2

[0021] Respectively for the same amount (10g / L) of PAC (prepared by dripping alkali method), AlCl 3 , FeCl 3 Compared with the composite paramagnetic nano-flocculation agent of Example 1, it was found that the composite magnetic nano-flocculation agent was better than other kinds of flocculants by treating the self-made wastewater with a chromaticity of 1000 times and a turbidity of 500 mg / L. Excellent decolorization and turbidity removal effect, high floc settling speed, and 65% reduction in sludge volume (compared with PAC). Through the application in the magnetic flocculation reactor, the recovery rate of 90% can be achieved for the composite magnetic nano-flocculation agent described in Example 1.

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Abstract

The invention discloses nano-composite paramagnetic flocculant and a preparation method thereof, and relates to magnetic flocculant which is used for precipitating the suspended particles and the colloidal particles in water body and a preparation method thereof. The invention is characterized in that the flocculant extracts and separates nano Al13 with high flocculation capacity from conventional PAC, combines the nano Al13 with a magnetic carrier SiO2 / Gama-Fe3O4-SiO2, and then obtains nano-composite paramagnetic flocculant with high purity and high efficiency. The flocculant has higher flocculation activity in a magnetic field. The preparation method has the advantages of simple production condition and low cost. The prepared nano-composite paramagnetic flocculant is suitable for the sewage treatment such as sewage containing metal particles, wastewater containing oil, printing and dyeing wastewater and the like. The sewage flocculation treatment proves that compared with the prior art, the invention has the advantages of good flocculation effect, high flocculation speed, low consumption, easy recovery, non-pollution to the environment and non-poisonous function to the human body.

Description

technical field [0001] The invention relates to a composite paramagnetic nano flocculant and a preparation method thereof, in particular to a nanoscale magnetic flocculant for flocculating and precipitating suspended particles, colloidal particles and the like in water bodies and a preparation method thereof. Background technique [0002] What kind of flocculant should be used to achieve high efficiency of sewage treatment is an important issue in the current water treatment process. Existing flocculants include inorganic flocculants, organic flocculants, microbial flocculants, and inorganic and organic polymer flocculants, all of which have unstable treatment effects, large dosage, large sludge output, difficult recycling, and self-response of the control system. The degree is poor, resulting in serious waste of flocculants, incomplete, easy to cause secondary pollution and other problems. Therefore, for different wastewater, determining a high-efficiency flocculant is a b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48C02F1/52
Inventor 吴春笃段明飞解清杰刘兴徐超朱国锋
Owner JIANGSU UNIV
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