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Ecologically safe composite efficient flocculant

A composite flocculant, an ecologically safe technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor flocculation effect of the initial material of pure natural polysaccharides, achieve good flocculation effect, wide applicability, and flocculation performance high effect

Inactive Publication Date: 2008-05-07
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flocculation effect of pure natural polysaccharide initial materials is not good
Foreign researchers tried to graft natural polysaccharides with acrylamide, and the obtained complex had a strong flocculation effect [Document 4: Kurenkov V.F., et al., 2001, Preparation of anionic flocculant by alkaline hydrolysis of polyacrylamide (Praestol 2500 ) inaqueous solutions and its use for water treatment purposes, Russian Journal of Applied Chemistry, 74(3):445-448; Literature 5: Morlay C., et al., 2000, The removal of copper(II)and nickel(II) from dilute aqueous solution by asynthetic flocculant: a polarographic study of the complexation with a high molecular weight poly(acrylic acid) for different pH values, Water Research, 34(2):455-459; Literature 6: Shih I.L., et al., 2001 , Production of a biopolymerflocculant from Bacillus licheniformis and its flocculation properties, Bioresource Technology, 78(3): 267-272; Literature 7: Tripathy T., Karmakar N.C. and Singh R.P., 2001, Development of novel polymeric flocculant based on grafted so alginate for the treatment of coal mine wastewater, Journal of Applied Polymer Science, 82 (2): 375-382], but the secondary pollution and biological toxicity of acrylamide monomer have not been effectively resolved

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] The present invention takes aluminum salt, cornstarch, dehydrated alcohol, sodium hydroxide (NaOH) as raw material, wherein: aluminum salt (AlCl 3 ), corn starch is the main component, absolute ethanol is used as the reaction solvent, and sodium hydroxide is used for the modification of corn starch; AlCl 3 The mass ratio of aluminum to cornstarch is 1:18;

[0030] Its preparation method is: (1) Preparation of aluminum salt: take 1 gram of aluminum powder according to the mass ratio and mix it with 20% HCl until it is completely dissolved to form AlCl 3 Solution; (2) modification of starch: get 18 grams of cornstarch and dissolve completely with absolute ethanol, slowly add 20mL 20%NaOH in a water bath at 55°C and slowly stir for modification reaction for 1 hour; (3) composite reaction: modify The final starch was made into a solution by adding water at a volume ratio of 1:3, and the pH was adjusted to 3.0 with 0.1N HCl solution, and the AlCl 3 The solution and the mod...

Embodiment 2

[0033] The difference from Example 1 is that the mass ratio of aluminum in the aluminum salt in the raw material of this example to cornstarch is 1: 100; its preparation method is: (1) the preparation of aluminum salt: 1 gram of aluminum powder with 20% HCl until completely dissolved to form AlCl 3 Solution; (2) modification of starch: get 100 grams of cornstarch and dissolve completely with absolute ethanol, slowly add 100mL 20% NaOH in a 75°C water bath and slowly stir for modification reaction for 10 hours; (3) compound reaction: modify The final starch was made into a solution by adding water at a volume ratio of 1:5, and the pH was adjusted to 5.0 with 0.1N HCl solution, and the AlCl 3 The solution was stirred and mixed with the modified starch and reacted in a 75°C water bath for 24 hours to obtain a white milky product, which is the product flocculant.

[0034] In this embodiment, the sewage to be treated is alkaline (pH=9), and the proportion of starch is increased to...

Embodiment 3

[0036] The difference from Example 1 is that the mass ratio of aluminum to cornstarch in the aluminum salt in the raw material of this example is 1:5; the preparation method is: (1) take commercially available AlCl 3 Make a solution, wherein: the aluminum content in the aluminum salt is 1 gram, (2) modification of starch: take 5 grams of corn starch and dissolve it completely with absolute ethanol, slowly add 5 mL of 20% NaOH in a water bath at 40 ° C and slowly stir for modification React for 30 minutes; (3) Composite reaction: add water to the modified starch in a volume ratio of 1:1 to form a solution, and then add AlCl 3 Stir and mix the solution with the modified starch, then adjust the pH to 6.0 with 0.1N HCl solution, and react in a 40°C water bath for 30 minutes to obtain a white milky product, and then wash the white milky product alternately with absolute ethanol and water Take off 3 times, filter, dry, and pulverize to obtain a white powder product.

[0037] The ob...

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Abstract

The present invention relates to sewage treatment and city water supply treatment, especially an logically safe composite efficient flocculant for water supply pre-treatment, industry effluent treatment and domestic sewage treatment. The flocculant is prepared with aluminum salt and corn starch as main material, absolute alcohol as reaction solvent and sodium hydroxide for modifying corn starch. The preparation process includes corn starch modification and composite reaction to produce white emulsified flocculant. It is economic, high in efficiency, ecological safe, wide in applicability and environment friendly.

Description

technical field [0001] The invention relates to sewage treatment, in particular to an ecologically safe composite flocculant used in water supply pretreatment, industrial waste water or domestic sewage treatment. Background technique [0002] Since the last century, flocculants have been widely used in water supply, industrial wastewater, and domestic sewage treatment. The flocculants can be divided into two types according to different materials: inorganic polymer type and organic synthetic polymer type. Among them, inorganic polymer flocculants represented by aluminum salts and iron salts are cheap and have good flocculation effects; organic polymers include polyacrylamides and other artificially synthesized polymers, and because of their good flocculation effects and less dosage, they are not widely used in the market. very popular. With the improvement of the degree of industrialization, the water consumption has increased sharply, the amount of waste water produced is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/54C02F1/56
Inventor 周启星张凯松任丽萍王新
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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