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Organic-inorganic in-situ composite flocculant and preparation method thereof

An in-situ compounding and flocculant technology, which is used in flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc., can solve the problems of viscosity drop of compound flocculants, and achieve effective decolorization effect, mild synthesis conditions, and easy industrial production. Effect

Inactive Publication Date: 2010-06-02
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent with the application number 200810046020.7, polyaluminum ferric chloride and cationic polyacrylamide were mixed to prepare organic-inorganic composite flocculants for sludge dewatering, but it still could not solve the problem of composite flocculants in the storage process due to the electrolyte effect of inorganic flocculants. The problem of viscosity drop

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: The organic-inorganic composite flocculant was prepared by in-situ polymerization using lethionite as the inorganic powder and acrylamide as the monomer.

[0014] Dissolve 0.5g hectorite in 50ml of distilled water, add 5g of acrylamide and 50mg of potassium persulfate to react at 40°C for 10 hours, and reflux with nitrogen gas. After the reaction, a transparent gel-like material is obtained. After vacuum drying, it is crushed, and 0.1g is added to 50ml In 0.1% methyl orange aqueous solution, stirring for 20 minutes, the decolorization rate can reach 92%. For example, add 0.1g of polyaluminum chloride and polyacrylamide into 50ml of 0.1% methyl orange aqueous solution and stir for 20min, the decolorization rate is only 56% and 67%. After immersing the polyacrylamide / lithium diatomite composite flocculant after absorbing methyl orange with ethanol for 24 hours, the composite flocculant is colorless, and the decolorization rate can reach 90% when used to adsorb ...

Embodiment 2

[0015] Example 2: In-situ polymerization of an organic-inorganic composite flocculant was prepared by using clay as an inorganic powder and acrylamide as a monomer.

[0016] Dissolve 0.3g of clay in 50ml of distilled water, add 4g of acrylamide and 50mg of ammonium persulfate to react at 40°C for 8 hours, and reflux with nitrogen. In the methyl red aqueous solution, stirring for 20 minutes, the decolorization rate can reach 95%. For example, add 0.1g of polyaluminum chloride and polyacrylamide into 50ml of 0.1% methyl red aqueous solution and stir for 20min, the decolorization rate is only 54% and 63%. After soaking the polyacrylamide / clay composite flocculant after absorbing methyl red with ethanol for 24 hours, the composite flocculant is colorless, and the decolorization rate can reach 92% when used to adsorb methyl red aqueous solution under the same conditions.

Embodiment 3

[0017] Example 3: In-situ polymerization of bentonite as inorganic powder and acrylamide as monomer to prepare organic-inorganic composite flocculant.

[0018] Dissolve 0.3g of bentonite in 50ml of distilled water, add 4g of acrylamide and 50mg of hydrogen peroxide to react at 30°C for 8 hours, and reflux with nitrogen. In acid red aqueous solution, stirring for 20 minutes, the decolorization rate can reach 93%. For example, add 0.1g of polyaluminum chloride and polyacrylamide into 50ml of 0.1% acid red aqueous solution and stir for 20min, the decolorization rate is only 58% and 66%. After immersing the polyacrylamide / bentonite composite flocculant after absorbing acid red with ethanol for 24 hours, the composite flocculant is colorless, and the decolorization rate can reach 91% when used to adsorb acid red aqueous solution under the same conditions.

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Abstract

The invention discloses an organic-inorganic in-situ composite flocculant and a preparation method thereof. The organic-inorganic in-situ composite flocculant is prepared by the steps of taking inorganic powder as a disperse phase, adding acrylamide, initiating agent and solvent to form a mixed solution system and carrying out in-situ polymerization reaction for 10 to 24 hours at 40 to 70 DEG C, wherein the mass percentage of the inorganic powder in the solution system is 1 to 60 percent, the mass percentage of the acrylamide in the solution system is 1 to 50 percent, and the mass ratio between the initiating agent and the acrylamide is 0.5 to 2: 100. The invention integrates the advantages of organic flocculant and inorganic flocculant and fully develops the flocculating effects of the acrylamide and the inorganic powder; and the organic-inorganic flocculant prepared by utilizing an in-situ composite technology can ensure that the decoloration ratio of dyeing wastewater can reach more than 90 percent. The flocculant has wide application range, low cost, simple and convenient method, mild synthesis conditions, strong practicability and easy industrial production.

Description

technical field [0001] The invention relates to a preparation method of an organic-inorganic in-situ composite flocculant for wastewater treatment. Background technique [0002] With the rapid development of dyes, the pollution caused by dye wastewater is becoming a serious environmental problem, and a considerable part of synthetic dyes are potentially toxic and non-degradable. According to statistics, the wastewater discharge of the printing and dyeing industry accounts for about 30% of the total industrial wastewater, and the average reuse rate is only 7%. Although the printing and dyeing industry has also spent a lot of energy on sewage treatment in recent years, the effect is not satisfactory. Due to the large volume, high concentration and complex composition of printing and dyeing wastewater, most of the organic components are aromatic hydrocarbons and heterocyclic compounds, the chemical oxygen demand (COD) is high, while the biochemical oxygen demand (BOD) is relat...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/30
Inventor 张秀菊林志丹郑少杰
Owner JINAN UNIVERSITY
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