Method and device for ultraviolet-ozone synergistic oxidation pretreatment of high-concentration wastewater

Abstract

The invention provides a method and device for pretreating high-concentration wastewater through ultraviolet-ozone co-oxidation. The method comprises the steps that high-concentration wastewater in a raw water tank and ozone are mixed to obtain milk white effluent water with ozone microbubbles, the milk white effluent water flows into a reaction tank provided with a vertical partition board, the vertical partition board divides the reaction tank into a water inlet side and a water outlet side, sulfuric acid and hydrogen peroxide are added into the water inlet side of the reaction tank, and organic pollutants are degraded under the joint action of the ozone and the hydrogen peroxide; one part of effluent water from the lower portion of the water outlet side of the reaction tank cyclically flows to the raw water tank to be subjected to another reaction, the other part of effluent water flows into an intensified reactor to be subjected to a photochemical reaction, the organic pollutants are degraded through synergistic effect of the effluent water subjected to the photochemical reaction and ozone produced subsequently, and the effluent water returns to the water inlet side of the reaction tank for a continuous reaction; produced water overflows into a produced water tank from the upper portion of the water outlet side of the reaction tank,and the subsequent biochemical treatment process is conducted after the pH value of the produced water is adjusted to range from 6 to 9. By means of the method, the treatment efficiency is high, and the treatment effect is good; the device can operate stably and is less in investment and low in operating cost.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a method and device for pretreating high-concentration wastewater by forced circulation ultraviolet-ozone synergistic oxidation. Background technique [0002] With the deepening of petroleum refining and the processing of low-quality crude oil, the high-concentration organic wastewater that is difficult to biodegrade is correspondingly increased, and they enter the water body and cause serious pollution to the environment. Biological treatment is often used to treat this kind of wastewater, and the aerobic method or improved aerobic method is the main method, and some also use anaerobic biological treatment. However, due to the high concentration of biodegradable substances and even biotoxic substances in refining wastewater, such as polycyclic compounds such as phenol, naphthalene, anthracene, and benzopyrene, etc., it will cause destructive impact on the biological treatment sy...

AI Technical Summary

Problems solved by technology

However, due to the high concentration of biodegradable substances and even biotoxic substances in refining wastewater, such as polycyclic compounds such as phenol, naphthalene, anthracene, and benzopyrene, etc., it will cause destructive impact on the biological treatment system.

[0003] In order to solve the problem of high-concentration chemical wastewater treatment, UV-ozone synergistic oxidation of organic pollutants is a multi-effect coupling advanced oxidation technology with mild reaction conditions, high removal efficiency, and no secondary pollution. However, this technology has ozone dissolution efficiency in wastewater. Low, pollutant deposition on the surface of ultraviolet lamps, etc.

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