Method and arrangement for a water treatment

摘要

The present invention relates to water treatment by chlorine disinfection (1, 100). A chlorine stabilizer (6) is dosed into water to be treated (3) as far as a predetermined chlorine stabilizer concentration in said water (3) is achieved(10). As soon as the predetermined chlorine stabilizer concentration is achieved said achieved chlorine stabilizer concentration is maintained in said water (3) constant (120). A chlorine disinfectant concentration is adjusted in said water to be treated (3) to a predetermined chlorine disinfectant concentration in said water (3) (130) by dosing a non-stabilized chlorine disinfectant (free chlorine) (5) into said water to be treated (3)(140). Therefore the invention combines advantages of free chlorine and stabilized chlorine disinfection with facilitating to reduce DBPs at low chlorine stabilizer concentrations in water without compromising disinfection safety.