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Preparation method of inorganic-organic composite coagulant

A composite flocculant, organic technology, applied in the field of environment and chemistry, can solve the problem of high dosage, achieve the effect of low dosage, good treatment effect, and large molecular weight

Inactive Publication Date: 2012-11-07
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above inventions are all inorganic composite coagulants, and there is still the problem of high dosage when treating raw water containing algae

Method used

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  • Preparation method of inorganic-organic composite coagulant
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  • Preparation method of inorganic-organic composite coagulant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of polyaluminum chloride-polydimethyldiallylammonium chloride composite flocculant, the steps are as follows:

[0028] Weigh 44.17g of AlCl 3 ·6H 2 O solid in a beaker, add distilled water to dissolve, and make AlCl 3 solution;

[0029] Weigh 19.63g of anhydrous Na 2 CO 3 , to AlCl under stirring conditions 3 Add Na to the solution 2 CO 3 , after the foam disappears, add 6.25g of polydimethyldiallylammonium chloride, then continue to stir at room temperature for 3h, and distill the volume to 500mL with distilled water to obtain an alkalinity of 2.0, Al 2 o 3 Polyaluminum chloride-polydimethyldiallylammonium chloride composite flocculant with a content of 18.89g / L.

Embodiment 2

[0031] As in the preparation method described in Example 1, the difference is that 3.12 g of polydimethyldiallyl ammonium chloride is added, and then stirring is continued at room temperature for 3 h, and then the volume is adjusted to 500 mL with distilled water to obtain an alkalized Degree 2.0, Al 2 o 3 Polyaluminum chloride-polydimethyldiallylammonium chloride composite flocculant with a content of 18.89g / L.

Embodiment 3

[0033] The preparation method of polyferric chloride-polydimethyldiallylammonium chloride composite flocculant, the steps are as follows:

[0034] Weigh 23.88g of FeCl 3 Put the solid in a beaker, add distilled water to dissolve, and obtain FeCl 3 solution;

[0035] Weigh 2.36g of anhydrous Na 2 CO 3 , to FeCl under agitation 3 Add Na to the solution 2 CO 3, after the foam disappears, according to FeCl 3 Medium Fe element and NaH 2 PO 4 The molar ratio of the P element in the medium is 25:2, adding NaH 2 PO 4 , add 6.25g of polydimethyldiallyl ammonium chloride, then continue to stir at room temperature for 3h, use distilled water to make up to 500mL, and obtain a degree of alkalinity of 0.5, Fe 2 o 3 Polymerized ferric chloride-polydimethyldiallylammonium chloride composite flocculant with a content of 13.33g / L.

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Abstract

The invention relates to a preparation method of an inorganic-organic composite coagulant, which comprises the following steps: inorganic matters AlCl3 and / or FeCl3 are dissolved in distilled water, and added with Na2CO3 to allow degree of alkalization to be 0.5-2.0; when Na2CO3 is dissolved in water, dimethyl diallyl ammonium chloride homopolymer is added in the solution according to that the mass ratio of Al and / or Fe to dimethyl diallyl ammonium chloride homopolymer is (4-8):1; and the homopolymer is mixed with the solution uniformly, and reacted for 1-3h to obtain the inorganic-organic composite coagulant. The inorganic-organic composite coagulant provided by the invention is prepared by taking AlCl3, FeCl3, Na2CO3, NaH2PO4 and PDMDAAC (poly dimethyl diallyl ammonium chloride) as main raw materials, has the characteristics of low dose, strong electric neutralizing capacity, large molecular weight and little sludge amount when being used, and has better treatment effect on the algae-containing raw water.

Description

technical field [0001] The invention relates to a preparation method of an inorganic-organic composite coagulant, in particular to a preparation method of an inorganic-organic composite coagulant used for the treatment of raw water containing algae, and belongs to the technical field of environment and chemistry. Background technique [0002] Coagulation is the aggregation process of colloidal particles and tiny suspended matter in water. Coagulation includes coagulation and flocculation. Coagulation refers to the destabilization process of colloids in water, while flocculation refers to the aggregation process of destabilized particles. Coagulation is one of the most important processes in water and wastewater treatment, and its treatment effect determines the operating conditions of subsequent processes, and has a greater impact on effluent water quality and operating costs. In the past few decades, research on coagulation technology has mainly focused on three aspects: c...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 高宝玉曹百川赵爽王萌萌岳钦艳王燕
Owner SHANDONG UNIV
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