A waste water treatment device implementing an electrolysis of waste water and applying a different waste treatment method in a different treatment bath depending on a property of or a condition of treatment water after an electrolysis of waste water

摘要

The present invention includes a water collecting tank 10 for collecting the inflowing wastewater; a PH adjusting tank 20 for adjusting the PH by introducing wastewater collected for a certain period of time from the water collecting tank 10, injecting caustic soda, and injecting an electrolyte from the salt dissolving tank; a flow rate control tank 30 for maintaining constant PH and electrical conductivity of the wastewater introduced from the pH control tank 20; an electrooxidation tank 40 for oxidizing and decomposing pollutants in the wastewater by electrolyzing the wastewater introduced from the flow rate control tank 30; After neutralizing residual chlorine by adding sodium thiosulfate aqueous solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is food wastewater. , petrochemical wastewater, or textile wastewater, and if flocs are generated in the treated water after treatment, a separate microbubble generator 90 ) and an inorganic coagulant to agglomerate the microbubbles supplied from and the microfloc flocked by electrical properties, respectively, and a microbubble mixing tank 51 to be mixed; a pressure flotation tank 52 for removing microbubbles and microflocs in which colloidal particles floating on the supernatant of the treated water introduced from the microbubble mixing tank 51 are collected using a scraper; After neutralizing residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is plating wastewater. , a settling tank 53 for precipitating sediment while introducing electrolysis-treated water in the case where the treated water is treated with metal product wastewater or mining wastewater and flocs are generated in the treated water after treatment; a concentrating tank 70 for concentrating the colloidal particles or the sediment deposited in the precipitation tank 53 that are collected in the microbubbles removed from the pressure flotation tank 52; a dehydrator 80 for dehydrating the concentrate transferred from the concentration tank 70; and an aqueous sodium thiosulfate solution to remove residual chlorine in the electrolyzed treated water in the electrooxidation tank 40 to neutralize residual chlorine. When the amount of colloidal particles floating in the treated water is less than 30 ppm Wastewater to which a different wastewater treatment method is applied in a different treatment tank according to the properties of the treated water after electrolysis and electrolysis of wastewater, characterized in that it includes a discharge tank 60 for discharging the supernatant water of the flotation tank 52 or the settling tank 53 It is about processing equipment.