coagulants flocculants apam polyelectrolyte cationic anionic

coagulants flocculants apam polyelectrolyte cationic anionic
Tags: , , , , , , ,
  • Are cationic polyelectrolytes used as coagulants?
  • According to literature, cationic polyelectrolytes have been most widely used as primary coagulants, however non-ionic and anionic polyelectrolytes are mostly used as flocculants (Bratby 2006). Different types of cationic polyelectrolytes are available commercially.
  • Which coagulants are used in polymer flocculation?
  • The dual system used for polymer flocculation was poly (ethylene oxide)/phenol formaldehyde (PEO/PFR) and FeCl 3 -PAM hybrid polymer . It is worth noting that making these extensively used organic coagulants/flocculants , is difficult and costly, which has limited their usage in wastewater treatment.
  • What is coagulation flocculation?
  • Coagulation–flocculation is the conventional treatment method where the cationic inorganic metal salts are commonly used as coagulants and long chains non-ionic or anionic polymers are usually employed as flocculants ( Chong, 2012 ). It is generally known that most of the suspended particles in wastewater carry negative charge in aqueous medium.
  • Do anionic polymer flocculants promote aggregation?
  • Owing to their high molecular weight of 10–20 million, anionic polymer flocculants can promote aggregation effectively at the amounts of several ppm for wastewater. The aggregation properties depend on pH, because the dissociation degree of anionic groups in the anionic polymer changes according to pH.