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High efficiency composite flocculant, its preparation method and application

A flocculant and composite technology, which can be used in flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc., can solve the problem of insignificant decolorization effect, and achieve the effects of excellent adsorption and decolorization ability, simple preparation method and low cost.

Inactive Publication Date: 2008-05-07
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of structural characteristics, polyaluminium-iron is a polymer flocculant obtained by copolymerization of aluminum salts and iron salts. It has a relatively large molecular weight and has a good decolorization effect. It also has certain applications in the treatment of water-soluble dye wastewater. , but the decolorization effect on difficult-to-handle disperse dyes and paints is not obvious

Method used

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  • High efficiency composite flocculant, its preparation method and application
  • High efficiency composite flocculant, its preparation method and application
  • High efficiency composite flocculant, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of Composite Inorganic Polymer Flocculant A

[0027] 1. Preparation of polyaluminium-iron flocculant

[0028] According to the ratio of 1:0.7, take 30 grams of aluminum chloride and 21 grams of ferric sulfate respectively, put them in the reaction bottle, add 400 mL of distilled water, reflux and stir at 50 ° C ~ 60 ° C, and the pH value is 2 ~ 3 for 0.5 ~ 1 Hour.

[0029] 2. Preparation of coagulant aid

[0030] Dissolve 20 grams of sodium silicate and 10 grams of silicon oxide in 100 ml of distilled water, adjust the pH to 3-4 with sulfuric acid or hydrochloric acid, reflux and stir at 50-60°C for 30-45 minutes to obtain the coagulation aid . (n=8).

[0031] 3. Polymerized aluminum-iron flocculant reacts with coagulant aid Z to prepare flocculant A

[0032] Put the synthesized polyaluminium-iron in a reaction bottle, and slowly add 0.9 g of coagulation aid (inorganic polymer compound n=8) under the conditions of 40°C-50°C and pH=3-4, and sti...

Embodiment 2

[0033] Example 2 Preparation of Composite Polymer Flocculant B

[0034] 1. Preparation of polyaluminium-iron flocculant

[0035]According to the ratio of 1:0.7, take 20 grams of aluminum chloride and 14 grams of ferric sulfate respectively, put them in the reaction bottle, add 270 mL of distilled water, and reflux and stir the reaction at 50 ° C ~ 60 ° C and the pH value of 2 ~ 3 for 0.5 ~ 1 Hour.

[0036] 2. Polymerized aluminum iron flocculant and coagulant dodecyl dimethyl tertiary amine are combined to form flocculant B. Under certain conditions, slowly add 20 grams of coagulant aid dodecyl dimethyl tertiary amine, and reflux and stir for 1.5 to 2 hours. After the compound is completed, the light yellow compound flocculant B is obtained.

Embodiment 3

[0037] Example 3 Preparation of composite inorganic-organic polymer flocculant C

[0038] 1. Preparation of composite inorganic polymer flocculant A

[0039] Put 34 grams of polyaluminium-iron in a reaction bottle, add 270 mL of distilled water, and slowly add 2 grams of coagulation aid (inorganic polymer compound n=8) at 40 ° C to 50 ° C and pH = 3 to 4 , reflux and stir for 1 to 1.5 hours. After the reaction is completed, a brown-yellow transparent composite flocculant A is obtained.

[0040] 2. Flocculant A and dodecyl dimethyl tertiary amine compound to form flocculant C

[0041] Put the synthesized flocculant A in a reaction flask, slowly add 20 grams of dodecyldimethyl tertiary amine under the condition of 50-60°C, and stir under reflux for 1.5-2 hours. The brown-yellow composite flocculant C can be obtained.

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Abstract

The present invention relates to a high-effective compound flocculating agent, its preparation method and application. Said flocculating agent is composed of flocculating agent and coagulant aids, in which the flocculating agent mainly is polymeric aluminium iron or polymeric aluminium, and the coagulant aids mainly have two classes, one is inorganic compound, for example sodium silicate, calcium hydroxide, calcium carbonate, magnesium hydroxide and high-molecular coagulant aids, and another is organic substance, for example polyacrylamine, dodecyl dimethyl tertiary amine, dicyandiamide and modified chitosan. It can be used for treating dyeing waste water.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing wastewater treatment. The invention relates to a composite polymer flocculant, a preparation method and an application, which can be used for the treatment of textile printing and dyeing wastewater. Background technique [0002] With the rapid development of the dye industry, tens of thousands of dyes are currently used in the world. The printing and dyeing wastewater mainly contains dyes, sizing agents, additives, oil agents, acids and bases, fiber impurities and inorganic salts, etc., with complex components, It has the characteristics of high concentration, high chroma, and refractory degradation. It is one of the main harmful wastewater commonly encountered in our country. The treatment of this type of wastewater must first solve the problem of decolorization. At present, the commonly used decolorization methods include neutralization method, oxidation method, adsorption method, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 王黎明沈勇丁颖张惠芳
Owner SHANGHAI UNIV OF ENG SCI
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