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Inorganic-modified chitosan composite type polymeric flocculant

A polymer flocculant, chitosan technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor flocculation performance and low solubility, and achieve less secondary pollution, wide molecular weight distribution, and more active groups. Effect

Inactive Publication Date: 2013-05-29
WUHAN SLOAN ELECTRIC
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  • Claims
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AI Technical Summary

Problems solved by technology

However, chitosan has the disadvantages of low solubility at room temperature and poor flocculation performance, so we usually use both after modification.

Method used

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  • Inorganic-modified chitosan composite type polymeric flocculant
  • Inorganic-modified chitosan composite type polymeric flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1, by reacting with acrylamide: chitosan at a mass ratio of 2:1 at 50° C. for 3 hours, the amount of the initiator used accounts for 0.02 part of the total mass of the solid to prepare a stock solution. When in use, dilute the stock solution 10 times. Compared with the conventional flocculant of the same concentration, see Table 1.

[0031]

[0032] Table 1

[0033]

[0034] Table 2

[0035] Through the above examples, compared with conventional inorganic flocculants and organic flocculants, it has obvious advantages in the removal of the chromaticity of wastewater and the removal of suspended solids in water; compared with pure chitosan flocculants, copolymer flocculation Agents make their respective functions better coordinated, effectively improve the flocculation effect, and have obvious effects on decolorization and turbidity removal.

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Abstract

The invention relates to an inorganic-modified chitosan composite type polymeric flocculant. The inorganic-modified chitosan composite type polymeric flocculant is characterized in that a method for preparing the composite type polymeric flocculant comprises the following steps of: taking polyacrylamide-modified chitosan as a raw material and methacryloyloxyethyl trimethyl ammonium chloride, maleic acid and ceric ammonium nitrate as initiators, synthesizing a modified chitosan copolymer under a faintly acidic condition and blending the modified chitosan copolymer with polymerized ferric chloride and polymerized aluminium chloride to obtain the inorganic-modified chitosan composite type polymeric flocculant. According to the steps, the mass ratio of modified starch to the chitosan is (1-2): 1, the reaction temperature is 50-60 DEG C, the reaction time is 2-3 hours, and the use amount of the initiators accounts for 0.02 part of the total mass of the system. The inorganic-modified chitosan composite type polymeric flocculant prepared by using the method has the characteristics of high efficiency, low cost and low secondary pollution to environment; and aiming at different sludges, compared with a conventional flocculant, the inorganic-modified chitosan composite type polymeric flocculant disclosed by the invention has the advantages that the wastewater decoloring rate and the wastewater deturbidity rate can reach more than 99 percent under the condition of low use amount.

Description

technical field [0001] The invention relates to an inorganic-modified chitosan composite polymer flocculant, which belongs to the technical field of water treatment flocculation. Background technique [0002] Domestically commonly used water treatment flocculants are mainly divided into two categories: inorganic flocculants and organic flocculants. Inorganic flocculants are mainly polyaluminum chloride and polyferric chloride-based flocculants. The principle is that through the collision of coagulated solids, the hydrolyzed products are agglomerated and bridging flocculated to form settleable or filterable flocculation. substances, in order to achieve the purpose of purifying water quality. However, the iron-containing flocculant brings iron ions into the system, which is easy to cause corrosion of equipment, and there are trace iron ions in the treated water, which has a certain chroma. The treatment effect of aluminum-containing flocculants is slightly better than that o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C08F291/12C08F220/34C08F222/02C08F4/40C08B37/08
Inventor 张广成
Owner WUHAN SLOAN ELECTRIC
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