Patent ID: 6132630
Filing Date: 2000-10-17
Classification: B01D,C02F

Abstract:
A method for separating components of a wastewater stream, the stream containing water, oil and contaminating solids, the method comprisingfeeding said wastewater stream to a first pre-treatment unit producing a first pretreated stream,feeding the first pretreated stream to a first centrifuge for centrifugal separation, producing a first liquid centrifuged stream, and a second liquid stream, andfeeding the first liquid centrifuged stream to a second centrifuge producing a resultant centrifuged stream of recoverable oil and a water phase centrifuged stream, wherein the oil includes light oil and the first liquid centrifuged stream is an overflow stream containing light oil, contaminating solids, and water and the second liquid stream is an underflow stream containing water, dissolved organic material, and suspended solids, the method further comprising:feeding the overflow stream to a second pre-treatment unit for breaking emulsions therein,feeding the underflow stream to the second pre-treatment unit for removal of water therefrom,the second pre-treatment unit producing a feed stream containing contaminating solids which is fed to the second centrifuge, and a water phase stream containing organic material and suspended solids.