Amphoteric polymer flocculant CGAAC

Amphoteric polymer flocculant CGAAC

[Preparation]

① Carboxymethylation reaction Weigh a quantitative amount of F691 powder, add a certain volume of solvent to disperse it evenly, then add quantitative lye to alkalize for 30 minutes, then add quantitative chloroacetic acid , and etherify at 50°C to obtain carboxymethylation Product
.

② Grafting copolymerization: Add carboxymethylated product and deionized water into a four-necked flask, pass nitrogen and heat to a predetermined temperature, add initiator and acrylamide monomer under stirring, and cool after reacting for a certain period of time to obtain the product CGAA
.

③Mannich reaction dissolves a certain concentration of graft copolymer in deionized water, then adds calculated amount of formaldehyde and dimethylamine , reacts at 30～70℃, and after cooling, the product is neutralized to pH=6～7 to obtain amphoteric Macromolecular flocculant CGAAC
.

[Application] (1) Application in natural source water treatment

Take the natural source water of a river in the south, which contains 1.
75mg/L of humic acid and 0.
2% of kaolin
.

Table 3-88 CGAC and CG-A combined with PAC to remove natural source water turbidity experimental results

It can be seen from the test data in Table 3-88 that because the source water contains a small amount of humic acid, a small amount of CGAC with a suitable amount of PAC can achieve a turbidity removal rate of 99.

(2) Study on the flocculation and dewatering performance of sludge

Wang Jie et al.
used CGAAC, a modified product of amphoteric F691 powder, to treat activated sludge, and compared the flocculation performance with cationic polyacrylamide (PAM-C).
The results are shown in Figure 3-33
.