Filtrationsverfahren zum Entfernen von Verunreinigungen wie Truebe und Farbe aus Wasser

摘要

Dispersed solid materials in aqueous waste waters are agglomerated for easier filtering by adding a polyelectrolyte, a floc former and a filter aid in any order in which the filter aid is present for incipient floc formation. The electrolytes exemplified are branch chain amines, quaternary ammonium or sulphonium salts. The floc formers exemplified are tri- and tetravalent metal salts and the filter aids exemplified are diatomaceous silica, perlite, or non-organic fibre.