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Novel compound water treatment flocculant as well as preparation method and application thereof

A flocculant and water treatment technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of secondary pollution particles, aluminum and iron residues, difficult to settle and other problems, achieve less dosage, enhanced bridging effect, Water solubility enhancement effect

Inactive Publication Date: 2015-09-09
于波 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention uses bentonite and chitosan that widely exist in nature as main raw materials, adopts acid-soluble-coating-loading technology to prepare chitosan-loaded bentonite, adopts quaternization reaction to prepare quaternized chitosan, and is compatible with polyferric sulfate at the same time. A new type of composite water treatment flocculant was prepared and applied in sewage treatment, which solved the problems of aluminum and iron residues in the water treatment process, the secondary pollution of acrylamide monomer and the single use of biological flocculant particles Disadvantages such as looseness and not easy to settle

Method used

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  • Novel compound water treatment flocculant as well as preparation method and application thereof
  • Novel compound water treatment flocculant as well as preparation method and application thereof
  • Novel compound water treatment flocculant as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Preparation and flocculation precipitation

[0032] Preparation:

[0033] Step 1) Take 12kg of chitosan in an acid-resistant container, add 60kg of hydrochloric acid with a mass concentration of 2%, stir and heat up to 55°C, and heat to reflux for 1 hour to obtain a chitosan acid solution, add 35kg of bentonite, continue stirring, and heat to reflux React for 1 hour to obtain chitosan acid-soluble coated bentonite solution. After evaporating the above solution to remove water, dry it at 105°C to constant weight, crush it through a 80-mesh sieve, and obtain chitosan-loaded bentonite.

[0034] Step 2) Get 24kg of chitosan in an acid-resistant container, add 48kg of hydrochloric acid with a mass concentration of 1%, stir and heat up to 85°C to obtain a chitosan acid solution, and configure 25kg of glycidyltrimethylammonium chloride into The aqueous solution with a mass concentration of 75% is slowly added dropwise to the above-mentioned chitosan acid solutio...

Embodiment 2

[0039] Embodiment 2: Preparation and flocculation precipitation

[0040] Preparation:

[0041] Step 1) Take 16kg of chitosan in an acid-resistant container, add 64kg of hydrochloric acid with a mass concentration of 2%, stir and heat up to 60°C, and heat to reflux for 0.8 hours to obtain a chitosan acid solution, add 28kg of bentonite, continue stirring, and heat to reflux React for 1 hour to obtain a chitosan acid-soluble coated bentonite solution. After evaporating the above solution to remove water, dry it to a constant weight at 105° C. and grind it through a 100-mesh sieve to obtain chitosan-loaded bentonite.

[0042] Step 2) Get 32kg of chitosan in an acid-resistant container, add 32kg of hydrochloric acid with a mass concentration of 1%, stir and heat up to 90°C to obtain a chitosan acid solution, and configure 18kg of glycidyltrimethylammonium chloride into An aqueous solution with a mass concentration of 80% is slowly added dropwise to the above-mentioned chitosan ac...

Embodiment 3

[0048] Embodiment 3: comparative experiment

[0049]Take the novel composite water treatment flocculant prepared in Example 1 as the group of the present invention, and a certain commercially available water treatment flocculant as the control group. The main components of this commercially available water treatment flocculant are ferric chloride, aluminum chloride, zinc sulfate , magnesium sulfate. The two groups of flocculants were applied to a certain municipal sewage. The dosing method was to directly add the flocculant to the sewage to be treated. The stirring was started during the dosing process, and the supernatant was taken after the reaction was completed and settled for 30 minutes. The results are as follows:

[0050]

[0051] It can be seen that, under the premise of the same water quality and the same dosage, the present invention has a better purification effect on municipal sewage.

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Abstract

The invention discloses a novel compound water treatment flocculant as well as a preparation method and application thereof, and belongs to the field of sewage treatment. The water treatment flocculant is prepared from bentonite and chitosan which exist extensively in the nature as main raw materials by the steps of adopting an acid dissolution-covering-loading technology to prepare chitosan-loaded bentonite, adopting quaterisation reaction to prepare quaterisation chitosan, and combining polymeric ferric sulfate at the same time, thereby preparing the novel compound water treatment flocculant. The novel compound water treatment flocculant is applied to sewage treatment to solve the problem of aluminum and iron residues during water treatment, the problem of secondary pollution of acrylamide monomers, and the defects of loose particles, difficult sedimentation and the like caused by single use of a biological flocculant.

Description

technical field [0001] The invention relates to the preparation and application of a water treatment flocculant, in particular to a novel composite water treatment flocculant and its preparation method and application, belonging to the field of sewage treatment. Background technique [0002] The flocculation and sedimentation method has become a sewage treatment method commonly used at home and abroad to improve the efficiency of sewage treatment due to its advantages of less land occupation, low cost, and convenient management. The flocculants used in the flocculation and sedimentation method include inorganic, organic and biological flocculants. Inorganic flocculants mainly include aluminum salts, iron salts and aluminum-iron-silicon complexes, etc. Excessive use of inorganic flocculants can easily cause problems such as aluminum and iron residues; although polyacrylamide organic polymer flocculants are used in small quantities, the flocculation speed is fast , the amount...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/56
Inventor 不公告发明人
Owner 于波
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