The role and application of chitosan in water treatment

  Chitosan is a linear polymer polysaccharide compound containing amino and hydroxyl groups, which can undergo hydrolysis, hydroxymethylation, sulfonation, oxidation, complexation, condensation and other reactions. Due to the presence of free amino groups in chitosan molecules, it has cationic polyelectrolyte properties and can be directly used as a flocculant or modified for use as a flocculant.

  In terms of physical and chemical properties, chitosan appears as a white powder, odorless, tasteless, and non-toxic. Due to being a bio based polymer with good biocompatibility, biodegradability, cell affinity and other properties, it causes less environmental pollution.

  The main role of chitosan in water treatment is adsorption and flocculation. When it dissolves in acidic media, the amine matrix is immobilized, exhibiting cationic characteristics. It also has the bridging and trapping effects of polymer flocculants, which can capture organic matter and heavy metal ions in water, inhibit the reproduction and growth of microorganisms in water, and have a certain bactericidal effect. It can be used as an adsorbent, flocculant, chelating agent, and purifying agent for drinking water Clarifiers and sludge conditioners for beverages and fruit juices.