The invention discloses a
treatment system and a treatment method that can realize the reuse of
coking wastewater. The
treatment system comprises a coagulating
sedimentation tank, a photocatalytic O3 oxidation device and a
filtration device; wherein the coagulating
sedimentation tank is provided with a water inlet for introducing biochemical
effluent and a
sediment discharge port, the water outlet of the coagulating
sedimentation tank is connected with the water inlet of the photocatalytic O3 oxidation device, the water outlet of the photocatalytic O3 oxidation device is connected with the water inlet of the
filtration device, and the
filtration device is provided with a water outlet connected with a recycled
pipe. The invention can finish three stages of treatment, namely the coagulation, photocatalytic O3 oxidation and filtration of
coking wastewater, and can decompose the harmful complex polymeric organic compounds in the
coking wastewater into micro-molecular compounds or directly mineralize the harmful complex polymeric organic compounds by the organic combination of the coagulating sedimentation tank, the photocatalytic O3 oxidation device and the filtration device; therefore, the
treatment system and the treatment method of the invention can ensure that the COD satisfies the standard of the production reuse water, further reduces the concentration of
ammonia nitrogen, and has the functions of discolorization, deodorization and sterilization at the same time.