The invention discloses a method and device for sterilizing a
water body in combination with three-dimensional
electrode and
photocatalysis, and application of the method and the device. The method comprises the steps of: firstly, treating the
water body to be treated by electrochemical reaction of the three-dimensional
electrode; and then, sequentially treating the
water body by
photocatalytic reaction agent under the excitation of
ultraviolet light to obtain the sterilized water body. The device for realizing the method comprises a three-dimensional
electrode electrochemical sterilization
pool and an
ultraviolet light catalytic sterilization
pool, which are sequentially connected with each other; the two
pool walls of the three-dimensional electrode electrochemical sterilization pool are respectively provided with a
cathode and an
anode, which are connected with a power supply, and the three-dimensional electrode electrochemical sterilization pool is internally provided with three-dimensional electrode filler; and the pool wall of the
ultraviolet light catalytic sterilization pool is fixedly provided with a photocatalyst layer, and the
ultraviolet light catalytic sterilization pool is internally provided with a plurality of ultraviolet lamps used for exciting photocatalyst. After the technology for combining the three-dimensional electrode sterilization and ultraviolet lightcatalysis is adopted, the lower
voltage and the
ultraviolet light catalysis is carried out, waste water with higher
bacteria-containing concentration can be treated efficiently, and the effect of continuous and efficient sterilization can be achieved by a one-
step method, so that the bright and clear in application prospect is realized.