One-step preppn process of flocculant

Abstract

The invention relates to the field of sewage treatment, in particular to a one-step preparation method of an ecologically safe composite high-efficiency flocculant used for industrial waste water or domestic sewage treatment. It uses inorganic aluminum salt, starch, water and sodium hydroxide (NaOH) as raw materials to produce an ecologically safe high-efficiency flocculant in one step. Specific preparation method: add inorganic aluminum salt, starch, water, and sodium hydroxide to the reaction system in a specific proportion and order, and adjust the reaction temperature in sequence according to the reaction process, and carry out starch causticization, aluminum salt polymerization, compounding of the two, and the product Ripening and other processes, and finally get the product. The invention is economical, efficient, wide in applicability and free from secondary pollution, and is an ecologically safe high-efficiency flocculant.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a preparation method of an ecologically safe composite high-efficiency flocculant used in water supply pretreatment, industrial waste water or domestic sewage treatment. Background technique [0002] At present, flocculants widely used in water supply and sewage treatment can be roughly divided into two categories: inorganic flocculants and organic flocculants. Among them, inorganic flocculants are represented by aluminum salts, iron salts and their polymers, which are cheap and have good flocculation effects; organic flocculants include natural organic polymer flocculants and synthetic polymer flocculants. Natural polymer flocculants mainly include starch, tannin and so on. Synthetic polymer flocculants are represented by polyacrylamides, which are also very popular in the market because of their good flocculation effect and low dosage. With the improvement of the degree of industrializatio...

AI Technical Summary

Problems solved by technology

[0004] 2. At present, polyacrylamide, the artificially synthesized organic polymer flocculant with the widest application range and the largest amount of use, is low in toxicity. Most of the products do not irritate the skin. The acrylamide monomer in the process is very harmful to human health. After use, most polymers are difficult to be degraded by the environment. They accumulate in large quantities in the natural environment and exist for a long time, bringing huge pressure to the environment; a small part can be degraded into small Molecules such as acrylamide monomer are toxic substances, which are toxic to the nerves of mammals. Cats are most sensitive to acrylamide toxicity, and their non-toxic daily intake is 0.3mg / kg, while the non-toxic daily intake of ordinary people is 0.5mg / kg

Generally speaking, natural polymer flocculants are cheap, but their molecular weight is low and unstable, and the amount of use is high, the effect is not good, and problems such as BOD may occur.

[0006] 4. The resource utilization rate in our country is low, and there are many waste residues and waste liquids containing aluminum elements. The discharge of these waste residues and waste liquids increases the pressure on the environment