One-step preppn process of flocculant

A technology of flocculant and corn starch, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, inorganic chemistry, etc., can solve the problems of great harm to human health, poor effect, high dosage, etc., and improve ecological safety performance, elimination of toxicity of aluminum salts, and optimization of spatial structure

Inactive Publication Date: 2009-07-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. At present, polyacrylamide, the artificially synthesized organic polymer flocculant with the widest application range and the largest amount of use, is low in toxicity. Most of the products do not irritate the skin. The acrylamide monomer in the process is very harmful to human health. After use, most polymers are difficult to be degraded by the environment. They accumulate in large quantities in the natural environment and exist for a long time, bringing huge pressure to the environment; a small part can be degraded into small Molecules such as acrylamide monomer are toxic substances, which are toxic to the nerves of mammals. Cats are most sensitive to acrylamide toxicity, and their non-toxic daily intake is 0.3mg / kg, while the non-toxic daily intake of ordinary people is 0.5mg / kg
Generally speaking, natural polymer flocculants are cheap, but their molecular weight is low and unstable, and the amount of use is high, the effect is not good, and problems such as BOD may occur.
[0006] 4. The resource utilization rate in our country is low, and there are many waste residues and waste liquids containing aluminum elements. The discharge of these waste residues and waste liquids increases the pressure on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present invention takes aluminum salt, cornstarch, sodium hydroxide (NaOH) as raw material, wherein: aluminum salt (AlCl 3 ), corn starch is the main component, NaOH is used for the modification of corn starch and the prepolymerization of inorganic aluminum salt; AlCl 3 The mass ratio of aluminum element to corn starch is 1:1;

[0033] Its preparation method is:

[0034] 1) Proportioning of causticized starch: 25% NaOH solution and 10% starch solution are fully mixed according to the mass ratio of NaOH to starch of 1:4.

[0035]2) Proportioning basic AlCl3: Add 25% NaOH solution and inorganic aluminum salt to the reaction system of 1) successively, wherein the mass ratio of NaOH to aluminum element (2.9:1), the mass ratio of aluminum element to cornstarch in 1) The ratio is 1:1.

[0036] 3) Control the reaction temperature to 40°C and pH value to 3, and carry out starch causticization, aluminum salt prepolymerization and composite reaction for 1 hour to obtain a ...

Embodiment 2

[0039] The present invention takes aluminum salt, cornstarch, sodium hydroxide (NaOH) as raw material, wherein: aluminum salt (Al 2 (SO 4 ) 3 ), corn starch is the main component, NaOH is used for the modification of corn starch and the prepolymerization of inorganic aluminum salt; AlCl 3 The mass ratio of aluminum element to corn starch is 2:1;

[0040] Its preparation method is:

[0041] 1) Proportion causticized starch: 15% NaOH solution and 8% starch solution are fully mixed according to the mass ratio of NaOH to starch of 1:3.

[0042] 2) Proportioning basic Al 2 (SO 4 ) 3 : Add 15% NaOH solution and inorganic aluminum salt to the reaction system of 1) successively, wherein the mass ratio of NaOH to aluminum element (2.5:1), the mass ratio of aluminum element to cornstarch in 1) is 2:1.

[0043] 3) Control the reaction temperature to 45° C., pH value to 4, carry out starch causticization, aluminum salt prepolymerization and composite reaction for 2 hours to obtain ...

Embodiment 3

[0046] The present invention takes aluminum salt, cornstarch, sodium hydroxide (NaOH) as raw material, wherein: aluminum salt (AlCl 3 ), corn starch is the main component, and sodium hydroxide is used for the modification of corn starch and the prepolymerization of inorganic aluminum salt; AlCl 3 The mass ratio of aluminum element to corn starch is 2:3;

[0047] Its preparation method is:

[0048] 1) Proportion causticized starch: 30% NaOH solution and 20% starch solution are fully mixed according to the mass ratio of NaOH to starch of 2:1.

[0049] 2) Proportioning basic AlCl 3 : 25% NaOH solution and inorganic aluminum salt are added to the reaction system of 1) successively, wherein the mass ratio of NaOH to aluminum element (3.1:1), and the mass ratio of aluminum element to cornstarch in 1) is 2:3.

[0050] 3) Control the reaction temperature to 55° C., pH value to 3, carry out starch causticization, aluminum salt pre-polymerization and composite reaction for 4 hours to...

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PUM

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Abstract

The invention relates to the field of sewage treatment, in particular to a one-step preparation method of an ecologically safe composite high-efficiency flocculant used for industrial waste water or domestic sewage treatment. It uses inorganic aluminum salt, starch, water and sodium hydroxide (NaOH) as raw materials to produce an ecologically safe high-efficiency flocculant in one step. Specific preparation method: add inorganic aluminum salt, starch, water, and sodium hydroxide to the reaction system in a specific proportion and order, and adjust the reaction temperature in sequence according to the reaction process, and carry out starch causticization, aluminum salt polymerization, compounding of the two, and the product Ripening and other processes, and finally get the product. The invention is economical, efficient, wide in applicability and free from secondary pollution, and is an ecologically safe high-efficiency flocculant.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a preparation method of an ecologically safe composite high-efficiency flocculant used in water supply pretreatment, industrial waste water or domestic sewage treatment. Background technique [0002] At present, flocculants widely used in water supply and sewage treatment can be roughly divided into two categories: inorganic flocculants and organic flocculants. Among them, inorganic flocculants are represented by aluminum salts, iron salts and their polymers, which are cheap and have good flocculation effects; organic flocculants include natural organic polymer flocculants and synthetic polymer flocculants. Natural polymer flocculants mainly include starch, tannin and so on. Synthetic polymer flocculants are represented by polyacrylamides, which are also very popular in the market because of their good flocculation effect and low dosage. With the improvement of the degree of industrializatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C02F1/56C01F7/00
Inventor 华涛周启星李威刘晓玲
Owner NANKAI UNIV
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