Treatment method and treatment device for concentrated water

The invention provides a treatment method and a treatment device for concentrated water, and relates to a wastewater treatment technology in the refining industry. The concentrated water treatment method comprises the following steps: carrying out first-stage ozone oxidation on to-be-treated concentrated water to obtain first-stage oxidization concentrated water; adjusting the pH value of the first-stage oxidation concentrated water, adding a coagulant into the first-stage oxidation concentrated water, carrying out coagulation and precipitation, taking the supernatant, and filtering with active sand to obtain active sand filtration concentrated water; carrying out second-stage ozone oxidation on the active sand filtration concentrated water to obtain tail gas and second-stage oxidation concentrated water; carrying out first-stage ozone oxidation on the to-be-treated concentrated water with the tail gas; and carrying out biochemical treatment on the second-stage oxidation concentrated water to obtain discharge