Various kinds of tannin flocculants were synthesised using spruce tannin, spruce-fir tannin, oak tannin, mimosa tannin, aleppo pine tannin, quebracho tannin, with suitable chemicals. Cationic flocculants were obtained on the basis of the Mannich reaction performed at constant mixing and constant temperature. The testing of flocculants was performed by standardised flock tester. Zeta potentials were measured using Laser Zeetm 501 zeta meter.
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