Preparation method of sewage treatment flocculant

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...

AI Technical Summary

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

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