Patent ID: 8617401

Claim:
A method for purifying waste water using a water purification apparatus, the water purification apparatus comprising: a reverse osmosis membrane module for separating the waste water into purified water and concentrated waste water, an emission control unit for controlling flow of the concentrated waste water, and a temperature sensing probe, the method comprising: separating waste water into purified water and concentrated waste water using the reverse osmosis membrane module and discharging the purified water; controlling said emission control unit to be switched off for a time interval T, whereby directing the concentrated waste water to flow back to the reverse osmosis membrane module; controlling said emission control unit to be switched on for an emission time, whereby directing the concentrated waste water to flow through said emission control unit; measuring a water temperature C of the waste water with the temperature sensing probe; and calculating a time interval T 1 according to the formula T 1 =T/[1âˆ’(25âˆ’C)Ã—3%] and controlling said emission control unit to be switched off for the time interval T 1 whereby directing the concentrated waste water to flow back to the reverse osmosis membrane module.