Abstract
Abstract Cationic lignin amine flocculants were obtained by the Mannich reaction of Kraft lignin with formaldehyde and polyamines. The cationic reaction products were tested as a flocculating agent by flocculation of reactive brilliant blue KN-R and linear alkylbenzene sulphonates in an aqueous system. The effects of flocculant dosage and pH on the flocculation performance are discussed in detail. The results indicate that under optimum conditions, the rate of eliminating reactive brilliant blue KN-R and linear alkylbenzene sulphonates from the water exceed 99% and 96% respectively, which illustrated that the cationic reaction products are extremely effective as flocculants for reactive brilliant blue KN-R and linear alkylbenzene sulphonates.
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