Mixed oxidant for water treatment as well as preparation method and preparation device thereof

The invention discloses a mixed oxidant for water treatment as well as a preparation method and a preparation device thereof. The mixed oxidant is prepared from 80 to 94.5% of chlorine, 3 to 10% of chlorine dioxide, 2 to 8% of ozone and 0.5 to 2% of hydrogen compound by mass percent, a pH value is 2.5 to 3.5, and the ORP (Oxidation-Reduction Potential) is 1000 to 1500 mv. According to the preparation method, tap water and 10 to 300 g/L electrolyte solution are input into a reactor according to the flow ratio of (3 to 13):(27 to 37), the control voltage is 10 to 30 V, the electric current is 6 to 30 A, an electrochemical reaction occurs, the mixed oxidant is obtained from an anode, and an alkaline solution is obtained from a cathode. The preparation device comprises a filter, an electrolyte solution tank, an electrode group, a reactor, an anode solution storage tank and a cathode solution storage tank. The method has the advantages of simple process, low cost and high production efficiency, the prepared mixed oxidant has high antibacterial property, high use efficiency and no chlorinated waste, and the mixed oxidant is mainly used for sewage treatment and can be used as a disinfectant.