Method and device for removing SCOD and total nitrogen in cold rolling biochemical effluent

The invention discloses a treatment method for removing SCOD and total nitrogen in cold rolling biochemical effluent, the method comprises the following steps: the cold rolling biochemical effluent enters an ozone catalysis tower through a water inlet pump, and water flow and air flow in the ozone catalysis tower are in the same direction and flow from the bottom to the top; the gas supply amount of the ozone reactor is 70-175 Nm < 3 >/h, the ozone concentration is 105-185 mg/L, and the cooling water amount is 1.5-2 Nm < 3 >/h; a ferromanganese modified carbon-based catalyst is placed in the ozone catalysis tower and accounts for 80-95% of the volume of the whole ozone catalysis tower; the retention time of the cold rolling biochemical effluent in the ozone catalysis tower is 25-45 minutes; the obtained cold rolling biochemical effluent enters a modified activated carbon adsorption tower through a first-stage lifting pump, modified activated carbon is placed in the modified activated carbon adsorption tower,