Method for preparing flocculating agent for water treatment

Abstract

The invention discloses a method for preparing a flocculating agent for water treatment, which comprises the following steps of: by weight percent, weighing 40 to 60 percent of guar gum, 20 to 40 percent of chloroacetic acid, and 20 to 35 percent of alkaline catalyst, placing weighed organic acid into a reactor; adding 80 percent of organic solvent till the organic acid dissolves uniformly and adding an excess amount of 30 percent alkaline catalyst; pouring the guar gum into the reactor, and stirring the mixture in the reactor at room temperature for 5 to 30 minutes till the mixture is uniform; after the material is in a semidry state, crushing the material and passing the crushed material through a sieve; placing the material in an reactor, and heating the reactor in a water bath for promoting the reaction, wherein the water bath temperature is kept between 50 and 80 DEG C, and the reaction lasts for 10 to 60 minutes; after reaction, obtaining carboxyl methylated guar gum by grinding and sieving.

Description

technical field [0001] The invention relates to a preparation method of a water treatment flocculant, in particular to a preparation method of a modified water treatment flocculant with adsorption and flocculation functions. Background technique [0002] Coagulation technology is one of the indispensable treatment methods in water supply and sewage treatment. The key to coagulation is the development of high-efficiency flocculants and the development of new flocculation equipment. [0003] At present, the use of flocculants in most water plants in China is still dominated by inorganic flocculants such as ferric chloride, aluminum sulfate, polyaluminum salt (PAC) and polyferric sulfate (PFS). In European countries, polymer flocculants are more commonly used, and the treatment effect is better. After adding the polymer flocculant, the floc sinks faster, the sludge produced is denser, and the dosage is less than that of the inorganic flocculant, so it has better application v...

AI Technical Summary

Problems solved by technology

[0004] Therefore, in recent years, researchers at home and abroad have devoted themselves to the research of high-efficiency, non-polluting, non-toxic polymer flocculants, and the most research results are polymer inorganic flocculants, and the preparation technology has been continuously improved, and some achievements have been successfully applied. And achieved certain economic benefits; microbial flocculants have been gradually studied recently, but they are still in the laboratory research stage; while the preparation cost of polymer organic flocculants is high, the residual monomers are highly toxic, and do not meet environmental protection requirements. Restricted, especially in the field of water supply and wastewater treatment, the application effect is not ideal