Caprolactam sewage advanced treatment method using ozone catalytic oxidation

Abstract

A caprolactam sewage advanced treatment method using an ozone catalytic oxidation technology is characterized in that the process flow of the method comprises the following steps: 1, pretreated caprolactam sewage is elevated through an inlet water elevator pump and enters a filter 3; 2, water discharged from the filter 3 automatically flows into an ozone catalytic oxidation tank 4, and ozone is introduced into the ozone catalytic oxidation tank 4 through an ozone generator 7 in order to carry out an ozone catalytic oxidation reaction; and 3, oxidized outlet water automatically flows into a clear water pool 5, air is pressed in through using a compressed air pump 8, and a backwash pump 6 backwashes clear water flowing from the ozone catalytic oxidation tank into the clear water pool 5 to the ozone catalytic oxidation tank 4 in order to accelerate oxidation. A metal ion supported catalyst is adopted in the invention, catalyzes generation of hydroxy free radicals from ozone, and reduces the activation energy of the oxidation reaction of the hydroxy free radicals, so organic matters difficult to degrade in the caprolactam sewage are mineralized and removed, or are directly oxidized and decomposed to form H2O and CO2.

Description

technical field [0001] The invention relates to a method for advanced treatment of caprolactam sewage by applying ozone catalytic oxidation. Background technique [0002] At present, the advanced treatment process for caprolactam sewage mainly includes biological oxidation method and physical and chemical advanced oxidation method. The biological oxidation method is represented by MBR process. The disadvantage is that the biodegradability of caprolactam advanced treatment sewage is extremely poor (BOD<10 ), the effect of biochemical process is limited, and it cannot meet the requirements of the first-class standard for sewage discharge; the advanced oxidation process includes direct contact oxidation with ozone, Fenton reagent, etc., and its disadvantages are unstable treatment effect, high operating cost, and secondary pollution, etc. . Contents of the invention [0003] Aiming at the problems and deficiencies in the above-mentioned prior art, the present invention pr...

AI Technical Summary

Problems solved by technology

[0002] At present, the advanced treatment process for caprolactam sewage mainly includes biological oxidation method and physical and chemical advanced oxidation method. The biological oxidation method is represented by MBR process. The disadvantage is that the biodegradability of caprolactam advanced treatment sewage is extremely poor (BOD<10 ), the effect of biochemical process is limited, and it cannot meet the requirements of the first-class standard for sewage discharge; the advanced oxidation process includes direct contact oxidation with ozone, Fenton reagent, etc., and its disadvantages are unstable treatment effect, high operating cost, and secondary pollution, etc.

Images