| abstract |
Described herein is a multistage treatment system (2,3, 200, 300) for a liquid. The system (2,3, 200, 300) comprises a first stage (4) with a first boiling vessel (24) and a first heater (26) configured to boil the liquid in the first boiling vessel (24) at a first pressure. The boiling of the liquid generates vapour including volatile contaminants. A first vapour outlet (35) is configured to vent the vapour from the first boiling vessel (24). A liquid outlet (46) provides for fluid flow from the first boiling vessel to a subsequent stage (6). A second stage (6) comprises a second boiling vessel (50) configured to receive liquid from the liquid outlet (46) and a second heater (54) to boil liquid in the second boiling vessel (50) to generate vapour. A condenser (14) receives the vapour from the second boiling vessel (50) and condenses the vapour to a liquid that is treated. An outlet (70) is configured to dispense treated liquid. |