Application of acrylamide-dimethyldiallylammonium chloride copolymer

[Application] Chen Weizhong and others used dimethyldiallylammonium chloride and acrylamide monomers as raw materials to prepare cationic polymer flocculant PDA with different cationic degrees by aqueous solution polymerization, and used a self-made cationic degree of 30% Comparison of sludge dewatering performance between 3#PDA and several cationic polyacrylamides on the market.
The results are shown in Table 3-19
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It can be seen from the data in the table that the copolymer of dimethyldiallylammonium chloride and acrylamide with a cationic degree of 30% has a good actual treatment effect in the sludge dewatering process of municipal sewage treatment.

Table 3-19 Comparison of treatment effects of 4 CPAM products

Zhang Yuejun et al.

reported on the application of PDA, a copolymer product of dimethyldiallylammonium chloride and acrylamide in the laboratory, and several representative cationic polyacrylamides (CPAM) on the market in the sludge of municipal sewage The effect of dehydration has been systematically compared, and the results are shown in Table 3-20 and Table 3-21

Table 3-21 Comparison of sludge dewatering performance of several different cationic polyacrylamide products

After treatment, the COD removal rate of the supernatant is over 78%, the permeability is over 90%, and the formed flocs are large and tough, which is easy for subsequent dehydration treatment
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The performance of the self-made PDA sample is similar to that of CPAM samples with different structures on the market

Guxue Fang et using dimethyl diallyl ammonium chloride (- DMDAAC) and acrylamide (AM) copolymer (PDA) treatment of papermaking waste paper, inorganic flocculants and polymeric studied aluminum chloride , ferric sulfate or an organic The flocculant PDA alone treats wastewater and the inorganic flocculant is used in conjunction with the organic flocculant to treat wastewater
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The results show that: the combination of inorganic flocculant and organic flocculant has a good treatment effect; the organic flocculant with higher relative molecular mass is more conducive to improving the treatment effect than the one with higher cationic degree.
When the dosage of flocculant is 300mg/L, the dosage of PDA-type organic flocculant is 3～6mg/L.
After the wastewater is treated by flocculation and sedimentation, the clear liquid permeability can reach more than 92%, the COD removal rate can reach 74%, and the COD value It can be reduced to about 100mg/L, the water quality meets the discharge standard, and the lower flocs are tough and easy to dehydrate; compared with the selected foreign product F4, the self-made PDA samples have better performance, and the lower flocs are larger, tough, and easy to dehydrate

Related links: Physicochemical properties and preparation methods of acrylamide-dimethyldiallylammonium chloride copolymer