Patent ID: 7153436
Filing Date: 2006-12-26
Classification: B01D,C02F

Abstract:
1. A method for combining specific polymeric additives in a liquid stream containing fine suspended solid particles to enhance hydraulic centrifugal separator (cyclone) performance, the cyclone having an upsteam feed inlet coupled to a mixing chamber having an overflow outlet, a conical section being coupled to and terminating opposite the mixing chamber in a downstream discharge apex, the method comprising the steps of: (a). introducing a liquid cationic coagulant, if necessary, into the liquid stream at a first distance upstream of the cyclone; (b). introducing a an anionic copolymer blend solution into the liquid stream at a second distance upsteam of the cyclone; (c). introducing an initial dose of cationic copolymer solution into the liquid stream at a third distance upstream of the feed inlet; (d). introducing a second dose of the cationic copolymer solution at a fourth distance upstream of the cyclone feed inlet; then (e). syphoning off through the overflow outlet an outflow fluid stream into a cone bottom tank; (f). introducing additional cationic copolymer solution, if needed, through a polymer ring located just above the apex; (g). remove flocculated solids settling in bottom of cone bottom tank; and (h). discharge cyclone underflow solids through the apex.