ON PREMISE WATER TREATMENT SYSTEM AND METHOD

摘要

A water treatment method uses a removable, disposable cartridge (2) having an internal mesh structure. A disposable heater (6) heats water fed to the cartridge. Precipitated solids collect on the mesh surface provided temperature and residence time are appropriately maintained. The heat breaks down the bicarbonate hardness of the water thereby depositing carbonates on the mesh surface and heavy metals will be codeposited due to the resultant change in pH. The cartridge has a head-space (11) for collecting entrained gases such as volatile organic compounds, chlorine and air. Water sterility is achieved by heating the water over an appropriate period of time. Turbidity is removed within the cartridge due to settling induced by the low fluid velocity controlled by a controller and by a filter provided at the outlet of the cartridge. The filter will become blocked when bicarbonate hardness is carried over forcing a user to replace a spent cartridge. Heat economy and a cool treated water outlet stream are secured by use of a heat exchanger (18). Water is fed from the cartridge, through an intercooler and the heat exchanger to a storage tank (26). Water in the storage tank is kept out of contact with air by a movable barrier. Eventually, the water is fed from the storage tank to a dispenser (50) and can subsequently be used in a post-mix beverage dispenser. A visual display indicates the status of the water treatment system.