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  • Does anionic polyacrylamide improve coagulation-flocculation process?
  • Aguilar, M. I. et al. Improvement of coagulation-flocculation process using anionic polyacrylamide as coagulant aid. Chemosphere 58, 47–56 (2005).
  • Which cationic polyelectrolytes are used in CF operations?
  • Examples of cationic polyelectrolytes that have been used in CF operations include poly (diallyldimethyl ammonium chloride), epichlorohydrin/dimethylamine polymers, cationic polyacrylamides, etc. Amongst the naturally occurring cationic polymers, chitosan is the most commonly used in CF operations.
  • What is the mechanism of coagulation in polymeric coagulants?
  • The negatively charged dispersed particles are neutralized by the positively charged coagulants and molecular attraction ensued (Fig. 4.3 b). This mode of coagulation mechanism is common with polymeric coagulants.
  • Can polyanion reduce cationic flocculants?
  • According to ref. , even the inclusion of a little polyanion can considerably reduce the flocculating action of cationic flocculants. This suppressive effect can be explained by a decrease in the effective collision radius induced by the swollen polymer coil shrinking because of an oppositely charged polymer link.