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Process for preparing ecological safety composite iron series high-effective flocculating agent

An ecologically safe and complex technology, applied in the field of water treatment, can solve the problems of complex production process of flocculation material, high production cost, ecological insecurity, etc., and achieve good flocculation effect, fast settling speed, and reduced dosage.

Inactive Publication Date: 2005-05-18
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 existing methods and production processes for screening, cultivating, fermenting and extracting flocculation substances by microorganisms and bacteria are complicated and the production cost is too high, and there are almost no reports of implementing large-scale industrialization at home and abroad.
[0008] For now, the ecological unsafety and secondary pollution to the environment caused by the two major types of flocculants, such as commercially available inorganic salts and artificially synthesized organic polymers, have become more and more popular. people's attention

Method used

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  • Process for preparing ecological safety composite iron series high-effective flocculating agent
  • Process for preparing ecological safety composite iron series high-effective flocculating agent
  • Process for preparing ecological safety composite iron series high-effective flocculating agent

Examples

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Effect test

Embodiment 1

[0036] The present invention takes iron salt, cornstarch, ethanol, sodium hydroxide (NaOH) as raw material; Wherein, iron salt is FeCl 3 , corn starch is the main component, ethanol is used as a reaction solvent, and sodium hydroxide is used for the modification of corn starch; the mass ratio of iron and corn starch in the iron salt is 1:8.

[0037] Its preparation method is as follows: (1) preparation of iron salt: take 1 gram of iron powder according to the mass ratio and use 20% HCl to completely dissolve and then use oxidant (chlorine gas) to form a solution containing ferric iron; (2) modification of starch : Get 3 grams of cornstarch and dissolve completely with 95% ethanol, slowly add 20% NaOH of 6mL in a water bath at 55°C and slowly stir the modified reaction for 1 hour; (3) composite reaction: FeCl 3 Stir and mix the solution with the modified starch, adjust the pH to 1.0 with 0.1N HCl solution, and react in a water bath at 55°C for 3 hours to obtain a reddish-brown ...

Embodiment 2

[0039] The difference from Example 1 is: water (distilled water, tap water) replaces absolute ethanol as the reaction solvent, and its preparation method is: (1) preparation of iron salt: get 1 gram of iron powder by mass ratio and use 10% HCl to After completely dissolving, use oxidizing agent (chlorine, hydrogen peroxide, etc.) Slowly add 6mL of 20% NaOH into a water bath at 55°C and stir slowly for 1 hour for the modification reaction; (3) Composite reaction: Mix the modified starch and iron salt thoroughly, adjust the pH to 1.0 with 0.1N HCl solution, and add FeCl 3 The solution was stirred and mixed with the modified starch and reacted in a water bath at 55°C for 3 hours to obtain a reddish-brown emulsion, which is the product flocculant.

Embodiment 3

[0041]The difference from Example 1 is that the mass ratio of iron to cornstarch in the iron salt is 1:1. Its preparation method is: (1) preparation of iron salt: take 1 gram of iron powder by mass ratio and use 20% HCl to completely dissolve, and then use oxidant (chlorine, hydrogen peroxide, etc.) to form a solution containing ferric iron; ( 2) Modification of starch: take 1 gram of corn starch and dissolve it completely with absolute ethanol, slowly add 6 mL of 20% NaOH in a water bath at 55°C and slowly stir for modification reaction for 1 hour; (3) Compound reaction: FeCl 3 Stir and mix the solution with the modified starch, adjust the pH to 1.5 with 1N HCl solution, and react in a 55°C water bath for 3 hours to obtain a reddish-brown emulsion, which is the product flocculant.

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Abstract

The invention relates to sewage treatment and urban water supply treatment, in particular to a preparation method of a series of ecologically safe composite high-efficiency flocculants used for water supply pretreatment, industrial waste water or domestic sewage treatment. It uses iron salt, starch, absolute ethanol, and sodium hydroxide as raw materials, of which: iron salt and corn starch are the main components, absolute ethanol or water is used as the reaction solvent, and sodium hydroxide is used for the modification of corn starch; iron salt The mass ratio of medium iron to starch is 1:1-1:100; specific preparation: 1) modification of starch; 2) composite reaction to obtain white-yellow or reddish-brown emulsion flocculant. The invention is economical, efficient, high in ecological safety, wide in applicability, free of secondary pollution, friendly to the environment and non-corrosive to equipment.

Description

technical field [0001] The invention relates to water treatment, in particular to a method for preparing an ecologically safe composite iron-based high-efficiency flocculant used in water supply pretreatment, drinking water purification, 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; flocculants can be divided into two types according to different materials: inorganic polymer type, organic synthetic polymer type; among them, aluminum salt and iron Inorganic polymer flocculant represented by salt is cheap, among them, the density and strength of the alum flowers formed by iron salt are higher, the water purification effect is remarkable, the effect is little affected by water temperature, the pH value is widely used, and it is better for some raw water. The treatment effect; artificially synthesized polymer floccu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 张凯松周启星刘宛任丽萍
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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