Patent ID: 7722772
Filing Date: 2010-05-25
Classification: B01J,C02F

Abstract:
1. An ion exchange apparatus comprising: (a) a resin bed housing part in which an ion exchange resin bed is housed; (b) a flow passage control valve for switching between a water service operation that supplies raw water with downflow to said ion exchange resin bed and produces soft water and a regeneration operation that recovers capacity of said ion exchange resin bed using salt water, wherein the regeneration operation comprises (i) a backwash process that supplies raw water with upflow to said ion exchange resin bed and washes away captured matter; (ii) a regeneration process that supplies salt water as a regenerant with upflow and/or downflow to said ion exchange resin bed; (iii) an extrusion process that supplies raw water with upflow and/or downflow to said ion exchange resin bed and pushes out the regenerant; (iv) a rinsing process that supplies raw water with downflow to said ion exchange resin bed and rinses off the remaining regenerant; and (v) a water-refill process that supplies raw water as refill water to a salt water tank and generates salt water from a regenerant salt, sequentially; (c) a salt water tank for reserving the regenerant salt and salt water to be used in said regeneration process; and (d) a salt water supply line for connecting between the flow passage control valve and the salt water tank, wherein the salt water supply line is provided with a flow detector that detects a flow rate in a direction of supplying salt water from said salt water tank and a flow rate of supplying refill water to said salt water tank.