Method and apparatus for purifying water

US5320755A · kind A · utility

Assignee

• AB Electrolux · SE

Inventors

• Peter Hagqvist · Alvesta, SE
• Per Fonser · Stockholm, SE
• Fredrik Dellby · Stuvsta-Snättringe, SE

Key dates

• Filing date: May 11, 1993
• Grant date: Jun 14, 1994
• Expiry date: May 11, 2013

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D61/22
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

When applying a method and an arrangement for purifying water, an inflow of contaminated water is converted to a pressure elevated flow which is divided in a purifying unit into a purified outflow and a contaminated outflow, which in turn is divided into a return flow and a reject flow. With the intention of providing a large return flow under high pressure for the purpose of rinsing clean the filter unit during operation, the return flow includes a first return flow (return conduit 24) which is recycled to the pressure-elevated flow (pressure conduit 16) and which is larger than the inflow, and further includes a second return flow which is pressure-restricted with respect to the first return flow, and the second return flow is returned to the inflow.