A kind of preparation method of sewage treatment flocculant

A technology of sewage treatment and flocculant, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of flocculation effect and degradability to be improved, flocculation effect and degradability to be improved, and poor flocculation effect, so as to achieve good flocculation effect, good biodegradability, cost-saving effect

Inactive Publication Date: 2018-08-31
北京荣士都生物科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing natural polymer flocculants have the problems of poor degradability, low safety, high cost and poor flocculation effect, so it is necessary to provide a flocculant with high safety, degradability and good flocculation effect
[0003] Chinese patent CN104017136B discloses a cellulose modified flocculant, which is to disperse cellulose in a mixed solution of ethanol and sodium hydroxide, alkalization, after alkalization, add chloroacetic acid, react, and finally use acid to lower the pH of the above system Adjust to neutral to obtain carboxymethyl cellulose; add initiator to the above solution, then slowly add methacryloyloxyethyltrimethylammonium chloride (DMC) solution to carboxymethyl cellulose In the plain solution, the mass ratio of methacryloyloxyethyltrimethylammonium chloride (DMC) to cellulose is: 0.1-10, at 45-75°C, react for 1-4h, and finally add acetone for precipitation to produce The obtained carboxymethyl cellulose is grafted with polymethacryloyloxyethyltrimethylammonium chloride, but the flocculation effect and degradability of the cellulose modified flocculant prepared by the invention need to be improved
[0004] Chinese patent CN103980367B discloses a preparation method of carboxy cellulose flocculant, the cellulose material is fully dissolved by sodium hydroxide and urea, and an oxidant is added to form aldehyde-based cellulose, and then the Schiff base path is used to react with the remaining solvent , to generate a carboxy cellulose flocculant, although the method is simple, the raw materials are easy to obtain, the production cost is low, and it is easy to popularize and apply, but its flocculation effect and degradability need to be improved

Method used

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  • A kind of preparation method of sewage treatment flocculant
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Examples

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Effect test

Embodiment 1

[0025] Example 1 A preparation method of flocculant for sewage treatment

[0026] S1 Wash 10 g of wheat bran residue with water for 4 times, add to 200 mL of acid mixture after natural air-drying, the acid mixture is composed of acetic acid and dilute sulfuric acid in a weight ratio of 1:2, leaching in a water bath for 1 hour, cooling and standing, and filtering to obtain Filter residue: wash the filter residue with water to neutrality, add in 100mL alkali mixed solution, the alkali mixed solution is composed of 0.5M sodium hydroxide and ammonia water in a weight ratio of 3:2, extract for 1h, filter, wash, and dry to obtain cellulose;

[0027] S2 Add 5 g of the cellulose obtained in step S1 into 5 mL of alkaline ionic liquid, stir and add 15 mL of sodium hydroxide solution, and stir evenly to obtain a cellulose solution; add the cellulose solution into a vacuum-sealed mold, and add 4 g of ether The etherifying agent is composed of methyl chloride and propylene oxide in a weig...

Embodiment 2

[0034] Example 2 A preparation method of flocculant for sewage treatment

[0035] S1 Wash 15g of wheat bran residue with water for 5 times, add to 225mL acid mixture after natural air-drying, the acid mixture is composed of acetic acid and dilute sulfuric acid in a weight ratio of 1:2, extract in a water bath for 1.5h, cool and stand, filter, Obtain filter residue; wash the filter residue to neutrality, add in 150mL alkali mixed liquor, described alkali mixed liquor is made up of 0.5M sodium hydroxide and ammonia water by weight ratio 3:2, leaching 1.5h, filter, wash, dry , get cellulose;

[0036] S2 Add 5 g of the cellulose obtained in step S1 into 8 mL of alkaline ionic liquid, and add 20 mL of sodium hydroxide solution with stirring, and stir evenly to obtain a cellulose solution; add the cellulose solution into a vacuum-sealed mold, and add 6 g of ether The etherifying agent is composed of methyl chloride and propylene oxide in a weight ratio of 1:3.5, reacted at 60°C for...

Embodiment 3

[0041] Example 3 A preparation method of flocculant for sewage treatment

[0042] S1 Wash 20g of wheat bran dregs with water for 5 times, add to 250mL acid mixture after natural air-drying, the acid mixture is composed of acetic acid and dilute sulfuric acid in a weight ratio of 1:2, extract in water bath for 2h, cool and stand still, filter to obtain Filter residue: wash the filter residue with water to neutrality, add in 200mL alkali mixed solution, the alkaline mixed solution is composed of 0.5M sodium hydroxide and ammonia water in a weight ratio of 3:2, extract for 2h, filter, wash, and dry to obtain cellulose;

[0043] S2 Add 5 g of the cellulose obtained in step S1 into 10 mL of alkaline ionic liquid, and add 25 mL of sodium hydroxide solution with stirring, and stir evenly to obtain a cellulose solution; add the cellulose solution into a vacuum-sealed mold, and add 8 g of ether The etherifying agent is composed of methyl chloride and propylene oxide in a weight ratio ...

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Abstract

The invention belongs to the technical field of water treatment engineering, and particularly relates to a preparation method of a sewage treatment flocculant. The preparation method of the sewage treatment flocculant comprises the following steps: S1. extraction of wheat bran cellulose; S2. modification of wheat bran cellulose; S3. modification of konjac glucomannan; S4. preparation of a graftedcopolymer; and S5. ionization of the grafted copolymer. In the preparation method provided by the invention, solvent recovery is adopted in a preparation process, so that the pollution to the environment is reduced, and the modified cellulose is directly dissolved, so that the complexity of preparation is reduced. Meanwhile, the flocculant prepared by the preparation method provided by the invention is safe and environment-friendly, and has good degradability and flocculation effect, wherein the turbidity removal rate is as high as 99.7%, the COD removal rate is as high as 94.3%, and the 30-day degradation rate is as high as 68.2%.

Description

technical field [0001] The invention belongs to the technical field of water treatment engineering, and in particular relates to a preparation method of a sewage treatment flocculant. Background technique [0002] As one of the important operations of solid-liquid separation in sewage treatment, coagulation is usually an essential part of the sewage treatment process. Compared with other water treatment technologies, flocculation treatment is cheaper, less energy consuming and easier to operate. At present, flocculants are mainly divided into three types: inorganic flocculants, organic flocculants and microbial flocculants. Among them, organic flocculants can be divided into organic synthesis and natural polymers. Natural polymer flocculants have attracted more and more attention from academia and society because of their advantages such as high selectivity, wide range of sources, low price, biodegradability, environmental friendliness, and non-toxicity. However, the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56
CPCC02F1/56
Inventor 葛延瑱莫锦和赵庆东袁俊彤张璐璐
Owner 北京荣士都生物科技有限公司
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