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As stated above, the practice of water purification in more recently introduced high-organic flocculants. They are water-soluble linear polymers in which a large number of groups related to the valence bonds.
Flocculants with different chemical nature can form a rigid chain (starch, cellulose derivatives), and flexible, capable of forming tangles (polyacrylamide).
Macromolecular Flocculants in most cases are polyelectrolyte’s dissociate in water into ions (anionic, cationic and amphoteric polyelectrolyte’s), while some flocculants do not dissociate in aqueous solutions, while remaining in the molecular state.
Flocculants such as anionic dissociation yield complex polymeric organic anion and cation simple and flocculants cationic type - complex organic cation and anion simple. Amphoteric flocculants type is in the chain of soluble high molecular substance basic and acidic groups, so dissociation and charge high molecular ion depends on the pH of the solution.
In water containing colloidal contamination of particles (clay, silt, etc.) are absorbed by molecules of polyacrylamide, with particle pollution are linked polymer chains. This leads to large rapidly flocculate.
The adsorption of flocculant particles of pollution can be provided when the electrostatic repulsion of the particles decreases by not less molecules of polyacrylamide and particulate matter to get close enough to have started work force of molecular attraction. This requires the addition of a coagulant (aluminum or iron salts) reduce the potential of suspended particles, i.e. implement pre-coagulation of the suspension. Only in the case of water pollution and harsh suspensions at high concentration of volatile suspended aggregation of polyacrylamide can be used independently, without a coagulant.
Polyacrylamide does not have a pronounced ability to absorb colloidal particles of humic compounds, so its use does not allow reducing the dose of coagulant required for bleaching the water. However, in some cases the addition of polyacrylamide and water when cleaning the color turns out to be useful, it can get harder and faster flocculate. The mechanism of adsorption of polyacrylamide aluminosilicates and hydroxides of metals depends not only on the forces of molecular attraction, but also a stronger hydrogen bond between the amide groups of the polymer with hydrogen and oxygen, aluminum silicates and metal hydroxides. This explains the strength of the resulting flakes. This is of great importance for the separation of particulate matter in clarifiers with a layer of suspended sediment in contact clarifiers and filters.