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Compound tap water flocculating agent of environment-friendly chitosan quaternary ammonium salt and aluminum polychloride

A chitosan quaternary ammonium salt, polyaluminum chloride technology, applied in the direction of flocculation/precipitation water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. Fast, reduce aluminum ion pollution, increase the effect of flocculation

Inactive Publication Date: 2014-12-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the most commonly used flocculant for tap water treatment in my country is polyaluminum trichloride (CF-PAC), because it will inevitably introduce aluminum ions in the process of tap water treatment, which will bring secondary pollution to the water body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First weigh 99.6g of acetic acid with a mass percentage concentration of 2%, add it to the reactor, add 0.4g chitosan under constant stirring, and stir at 16°C for 1.5 hours to obtain the mass percentage of chitosan 0.4% acetic acid solution;

[0031] Preparation of glycidyltrimethylammonium chloride: Take 100mL trimethylamine in a three-necked flask, slowly add concentrated hydrochloric acid dropwise under ice bath, and adjust the pH value to 8.0. Raise the temperature to 30°C, slowly add 40mL of epichlorohydrin dropwise, and adjust the pH to 8.5 with NaOH. Then raise the temperature to 50°C-70°C and react for 2-4h to obtain glycidyltrimethylammonium chloride solution.

[0032] Then adjust the pH of the acetic acid solution of chitosan to 8.0. After the chitosan is separated out, place the separated out chitosan in a three-necked flask, Add glycidyltrimethylammonium chloride in an amount of 10ml, and react at 70°C for 2h. The crude product was dialyzed with a dialys...

Embodiment 2

[0038] First weigh 99.2g of acetic acid with a mass percentage concentration of 3%, add it to the reactor, add 0.8g chitosan under constant stirring, and stir at 20°C for 2.0 hours to obtain the mass percentage of chitosan 0.8% acetic acid solution;

[0039] Then adjust the pH of the acetic acid solution of chitosan to 8.5. After the chitosan is separated out, place the separated out chitosan in a three-necked flask, Glycidyltrimethylammonium chloride was added in an amount of 11ml, and reacted at 75°C for 4h. The crude product was dialyzed with a dialysis membrane for 5 days, the filtered dialysate was concentrated under reduced pressure, precipitated with 98% ethanol, and the precipitate was dried at 37°C to obtain chitosan quaternary ammonium salt.

[0040] Dissolve chitosan quaternary ammonium salt to make a 0.2g / L solution.

[0041] According to the mass ratio of sodium hydroxide: sodium bicarbonate: polyaluminum chloride: montmorillonite: water = 0.1:0.9:2:7:90 after m...

Embodiment 3

[0045] First weigh 98.8g of acetic acid with a mass percentage concentration of 4%, add it to the reactor, add 1.2g of chitosan under constant stirring, and stir for 2.5 hours at 24°C to obtain the mass percentage of chitosan 1.2% acetic acid solution;

[0046] Then adjust the pH of the acetic acid solution of chitosan to 9.0. After the chitosan is separated out, place the separated out chitosan in a three-necked flask, Add glycidyltrimethylammonium chloride in an amount of 12ml, and react at 80°C for 6h. The crude product was dialyzed with a dialysis membrane for 5 days, the filtered dialysate was concentrated under reduced pressure, precipitated with 98% ethanol, and the precipitate was dried at 37°C to obtain chitosan quaternary ammonium salt.

[0047] Dissolve chitosan quaternary ammonium salt to make a 0.3g / L solution.

[0048] According to the mass ratio, sodium hydroxide: sodium bicarbonate: polyaluminum chloride: montmorillonite: water = 0.1:0.9:3:8:88 is uniformly m...

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Abstract

The invention relates to a compound tap water flocculating agent of environment-friendly chitosan quaternary ammonium salt and aluminum polychloride. The compound tap water flocculating agent is characterized by being composed of an environment-friendly chitosan quaternary ammonium salt solution and an aluminum polychloride solution. The compound tap water flocculating agent is prepared through the following steps: dissolving the chitosan quaternary ammonium salt to prepare the chitosan quaternary ammonium salt solution, adding glutaraldehyde to the chitosan quaternary ammonium salt solution while stirring, wherein the 1-4mol of glutaraldehyde is added into each liter of chitosan quaternary ammonium salt solution, and then reacting for 2-4h at a low temperature of 50-60 DEG C, and finally, slowly and dropwise adding the aluminum polychloride solution to the chitosan quaternary ammonium salt solution in the volume ratio of 1: (1-4), and finally, curing to obtain the compound tap water flocculating agent. The compound tap water flocculating agent of the environment-friendly chitosan quaternary ammonium salt and the aluminum polychloride is large in flocculated particles and high in settling speed; the removal rate of the compound tap water flocculating agent on the turbidity of raw water is 99.34%, which is slightly higher than a traditional flocculating agent; besides, the raw water having the turbidity in the range of 70-100NTU is treated once so that the turbidity can be up to the national standards and within 1NTU.

Description

technical field [0001] The invention belongs to the field of tap water treatment, and relates to an environment-friendly tap water composite flocculant of chitosan quaternary ammonium salt and polyaluminum chloride and its application in tap water flocculation treatment. Background technique [0002] At present, the most commonly used flocculant for tap water treatment in my country is polyaluminum trichloride (CF-PAC), because it will inevitably introduce aluminum ions in the process of tap water treatment, which will bring secondary pollution to the water body. After the residual aluminum in tap water enters the human body, part of it is excreted with feces, and the rest is enriched in blood, muscle, bone and other tissues and organs. When the concentration of aluminum in the body exceeds a certain value, it will cause biological lesion. Long-term intake of aluminum ions can lead to various diseases such as cerebral dementia and osteoporosis, and endanger human health. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F1/463C02F1/28
Inventor 曾德芳李壮杜友福王晨阳王飞宇孙樟民
Owner WUHAN UNIV OF TECH
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