Polymerized ferric sulfate-carboxymethyl potato starch composite flocculant and its preparation and application

Abstract

The invention relates to a polymeric ferric sulfate-carboxymethyl potato starch composite flocculant. The flocculant is complexed by polymeric ferric sulfate and carboxymethyl potato starch, wherein the weight ratio of Fe in polymeric ferric sulfate to carboxymethyl potato starch is 1:3-3:1. The invention also discloses a preparation method of the flocculant and an application of the flocculant in the COD wastewater treatment. After the composite flocculant prepared from carboxymethyl potato starch is introduced in polymeric ferric sulfate, the defect that the molecular chain of the inorganicflocculant is short can be overcome, the damage of the residues generated in the flocculation process of polymeric aluminum and the synthetic macromolecular flocculant can be avoided; and the charge neutralization capability can be fully utilized, the flocculant has high-effect functions of bridging and net capturing and tiny particles in wastewater can be removed through sweeping, thus the removal efficiency can be increased.

Description

technical field [0001] The invention relates to the technical field of water treatment flocculants, in particular to a polymeric ferric sulfate-carboxymethyl potato starch composite flocculant and its preparation and application. Background technique [0002] Inorganic polymer flocculant is a new type of water treatment agent developed on the basis of traditional aluminum salt and iron salt flocculant. Traditional aluminum salt and iron salt flocculants have been used for a long time, but there are many problems in the process of water treatment. They were replaced by inorganic polymer flocculants that gradually developed rapidly in the late 1960s. The latter has better performance than the former. Excellent flocculation effect and low price. So far, there have been quite large-scale productions in the United States, Japan, Western Europe, and Russia, and the process control automation has been achieved, and the product quality is stable. With the development of my country...

AI Technical Summary

Problems solved by technology

Although a wide variety of inorganic-synthetic organic polymer composite flocculants have been produced over the years, the cost is relatively high due to the refractory organic polymer components, and some are toxic. For example, polyacrylamide is safe and non-toxic, but its decomposition The acrylamide monomer is a kind of neurotoxic agent, which can damage the nervous system. After poisoning, it will show symptoms such as body weakness and ataxia, which also greatly affects their application.