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Composite flocculant for water treatment and its preparing process

A composite flocculant and water treatment technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of limited application, electrical neutralization and flocculation effect to be strengthened, so as to reduce toxicity and reduce atherosclerotic plaque formation, high flocculation efficiency

Inactive Publication Date: 2008-07-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These problems have limited the application of polysilicon ferrosilicon in urban water supply treatment (Zheng En, Lai Mingzhong. The sanitary safety of flocculant [J]. Water purification technology, 2005, 24 (4): 53-54; Guichunzhang, et al, 2000, Mechanism study of coagulant impact on mutagenic activity in water, Water Research, 34(6): 1781-1790)
[0007] Moreover, the flocculant prepared by this method uses divalent or trivalent metal salts as the raw materials, and needs to be strengthened in terms of electrical neutralization and flocculation effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a composite flocculant for water treatment, the technical scheme of which is: first dilute industrial water glass with water to SiO 2 The content of NaOH is 3-3.5wt%, and the NaOH solution with a concentration of 2-3mol / L is slowly added to adjust the pH value to 8.0-9.0. Stir at room temperature for 0.5-1 hour, the stirring rod of the stirrer is made of plastic, and the stirring speed is 50-120 rpm. Then adjust the pH value to 11.0-12.0 to obtain basic polysilicic acid.

[0020] Then dissolve titanium sulfate in water to prepare a solution with a concentration of 0.5-0.8 wt%, add 15 wt% sulfuric acid, and adjust the pH value to 1.5-2.0 to obtain a titanium sulfate solution.

[0021] Then mix titanium sulfate solution and basic polysilicic acid at room temperature according to the molar ratio of Ti and Si of 1:2.5-3, and react for 1-1.5 hours to obtain the polysilicon-titanium composite flocculant.

[0022] Treat river water with the product pre...

Embodiment 2

[0024] A method for preparing a composite flocculant for water treatment, the technical scheme of which is: first dilute industrial water glass with ethanol to SiO 2 The content of NaOH is 3-3.5wt%, slowly add NaOH solution with a concentration of 3-3.5mol / L, adjust the pH value to 8.0-9.0, stir at room temperature for 0.5-1h, the material of the stirrer rod is plastic, stir The speed is 50-120rpm. Then adjust the pH value to 11.0-12.0 to obtain basic polysilicic acid.

[0025] Dissolving titanium tetrachloride in water to prepare a solution with a concentration of 1-1.5 wt%, and then adding 15-20 wt% sulfuric acid to adjust the pH value to 1.5-2.0 to obtain a titanium tetrachloride solution.

[0026] Then titanium tetrachloride solution and basic polysilicate are mixed at room temperature according to the molar ratio of Ti and Si being 1:1, and react for 1-1.5 hours to obtain polysilicon-titanium composite flocculant.

[0027] Using the product prepared in this example to t...

Embodiment 3

[0029] A method for preparing a composite flocculant for water treatment, the technical scheme of which is: first dilute the industrial water glass with a mixture of water and ethanol to SiO 2 The content of NaOH is 3.5-4wt%, and the NaOH solution with a concentration of 4mol / L is slowly added to adjust the pH value to 8.0-9.0. Stir at room temperature for 0.5-1 hour, the stirring rod of the stirrer is made of plastic, and the stirring speed is 50-120 rpm. Then adjust the pH value to 11.0-12.0 to obtain basic polysilicic acid.

[0030] Then dissolve titanium tetranitrate in water to form a solution with a concentration of 1.5-2wt%, and then add 20-25wt% sulfuric acid to adjust the pH value to 1.5-2.0 to obtain a titanium tetranitrate solution.

[0031] Then titanium tetranitrate solution and basic polysilicic acid are mixed at room temperature according to the molar ratio of Ti and Si being 1:0.3-0.8, and reacted for 1.5-2 hours to obtain polysilicon-titanium composite floccula...

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Abstract

The present invention relates to composite flocculant for water treatment and its preparation process. Technologically, the composite flocculant is prepared with titanium salt and industrial water glass as main material and sulfuric acid and sodium hydroxide as reaction assistants. The preparation process includes the following steps: diluting industrial water glass to SiO2 concentration of 2.5-4 wt %; adding 2-5 mol / L concentration NaOH solution to regulate pH value first to 7.0-9.0, stirring at normal temperature for 0.5-1 hr, regulating pH then to 11.0-12.0 to obtain basic polysilicic acid; dissolving titanium salt in water to obtain 0.5-2 wt % concentration solution, adding 15-25 wt % concentration sulfuric acid solution to regulate pH to 1.0-2.0 of the titanium salt solution; mixing the titanium salt solution and the basic polysilicic acid in the Ti / Si molar ratio of 1 / 3-1 / 0.3 at normal temperature; and reaction for 0.5-2 hr.

Description

technical field [0001] The invention relates to the technical field of water treatment agent. In particular, it relates to a high-efficiency composite flocculant for urban water supply treatment, industrial wastewater treatment or domestic sewage treatment and a preparation method thereof. Background technique [0002] Flocculants are widely used in water supply, industrial wastewater, and domestic sewage treatment. According to different materials, they can be divided into two types: inorganic polymer type and organic polymer type. Among them, the inorganic polymer flocculant represented by aluminum salt and iron salt is cheap, and the flocculation effect is better; the organic polymer flocculant represented by artificially synthesized polyacrylamide is also because of the good flocculation effect, and the dosage is less Very popular in the market. However, these flocculants bring great pressure to the environment and pose obvious or potential hazards to human health duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 刘红梁晶幸福堂陈旺生邵俊
Owner WUHAN UNIV OF SCI & TECH
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