Method for preparing low-cost modified flocculant for waste water treatment

Abstract

The invention discloses a method for preparing a low-cost modified flocculant for waste water treatment. The method comprises the following steps: preparing hydroxymethyl starch; uniformly mixing and stirring the prepared hydroxymethyl starch and deionized water under the environment of constant temperature water bath; adding ceric ammonium nitrate with proper concentration of 1*10<-3> mol / L to the obtained mixture to be used as an initiator; adding acrylamide, the weight of which is 1.5-3 times of that of the hydroxymethyl starch to the mixture; controlling the reaction temperature to be 40-60 DEG C and reaction time to be 1-3 hours under the reaction environment of nitrogen protection so as to obtain a graft copolymer; uniformly mixing and stirring the graft copolymer and the deionized water; adding formaldehyde and a dimethylamine solution to the obtained mixture; controlling the reaction temperature to be 40-60 DEG C and the reaction time to be 1-3 hours; after the reaction is finished, cooling the reaction liquid to room temperature and leading the reaction liquid into an acetone solution for precipitation; washing the precipitate for multiple times to obtain the modified flocculant. The method for preparing the low-cost modified flocculant for waste water treatment, disclosed by the invention, has the advantages of wide production raw material source, low cost, wide pH value application range, excellent flocculating performance and so on.

Description

technical field [0001] The invention relates to wastewater treatment technology, in particular to a method for preparing a low-cost modified flocculant for wastewater treatment. Background technique [0002] Flocculant, also known as settling agent, is a substance used to flocculate and coagulate solutes, suspended particles or colloids in a mixed solution system to produce flocculent precipitation. Flocculation reaction is a complex physical and chemical process, and its flocculation mechanism is not yet fully mature. At present, a relatively unified understanding is that the mechanism of action of flocculants is the unity of the two processes of flocculation and coagulation. The flocculation process of water treatment is to add a flocculant to the water system to be treated, so that the suspended particle system in the water phase, under the promotion of the flocculant, collides with each other, destabilizes, and then condenses into particles of a certain size. , Net cap...

AI Technical Summary

Problems solved by technology

Inorganic flocculants are cheap, but they will have adverse effects on human health and the ecological environment; although organic polymer flocculants are used in a small amount, the scum output is small, the flocculation ability is strong, the flocs are easy to separate, and the effect of removing oil and suspended matter is good , but the residual monomers of this type of polymer have "three-caused" effects (causation, carcinogenicity, and mutagenesis), thus limiting its application range; microbial flocculants are easy to use and have a promising application prospect because of the absence of secondary pollution seductive