Method for expanding the capacity of ultraviolet photocatalytic wastewater degradation reactor to prevent secondary pollution

Abstract

The invention relates to an expansion method of a reactor for secondary-pollution-preventing wastewater degradation through ultraviolet catalysis, and belongs to the technical field of wastewater treatment. In the prior art, problems of loss of nanometer photocatalyst, microwave energy dissipation, small capacity of single tank, incomplete utilization of ozone, difficulty of distinguishing reaction finish, difficulty of in situ strong dissipation of catalyst conglobation and the like exist. The problems are solved by the scheme. In the scheme, the method mainly comprises the following steps of: constraining microwave to irradiate appointed areas; expanding the size of the reactor; improving the air supply strength for critically degradation reaction area; gradually intercepting the nano catalyst by an external cascaded three-level back-wash filter; strongly dissipating catalyst conglobation by ultrasonic in situ from the bottom of the reactor, and meanwhile, carrying a cleaning quartz tube; monitoring the reaction process by an ozone sensor and driving a power supply control mechanism through sensing electric signals, and shutting down associated power supplies immediately at the degradation ending.

Description

technical field [0001] The invention relates to a method for expanding the capacity of an ultraviolet photocatalytic wastewater degradation reactor for preventing secondary pollution, and belongs to the technical field of CO2F wastewater treatment. Background technique [0002] Microwave photocatalytic degradation treatment technology, as an effective harmless treatment technology for industrial wastewater containing organic pollutants, has attracted much attention in recent years. [0003] Regarding the microwave photocatalytic degradation technology, as an example, refer to the Chinese patent application with publication number CN102260003A. [0004] The Chinese patent application with the publication number CN102260003A uses microwaves as the excitation source to excite the electrodeless ultraviolet lamp to emit ultraviolet rays, and irradiates the suspension mixed with photocatalyst titanium dioxide inside the liquid. The electrodeless ultraviolet lamp is shrouded and pr...

AI Technical Summary

Problems solved by technology

[0036] In the device structure expressed in the Chinese patent application with the publication number CN102260003A, the outer wall of the quartz tube used to screen the electrodeless ultraviolet lamp refers to the outer wall of the quartz tube, which is treated with the treated industrial wastewater for a long time. Contact, it is inevitable to gradually accumulate fouling. Of course, the fouling substances are mainly inorganic impurities that are not easily touched by the photocatalytic reaction. The fouling phenomenon formed by this mechanism is easy to be observed after the equipment has been running for a long time; Although the fouling layer on the outer wall of the quartz tube is only a thin layer, it is enough to significantly block the ultraviolet radiation of the electrodeless ultraviolet lamp, which will cause the actual treatment efficiency of the microwave photocatalytic reaction treatment device to be greatly reduced; The rising air bubbles in the reactor are too scattered and the flushing force is weak. It is really difficult to maintain the surface of the quartz tube by relying on the relatively dispersed air bubbles. In other words, the more dispersed air bubbles are more The weak scouring force is not enough to completely stop the fouling process on the surface of the quartz tube; during the use of the laboratory scale, the above-mentioned fouling problem is not easy to detect, but, on the industrial application scale, the fouling problem will undoubtedly be eliminated. Therefore, how to immediately and effectively remove the fouling layer on the outer wall of the quartz tube without dismantling the machine, and maintain the continuous high efficiency of the microwave photocatalytic treatment device, this problem cannot be ignored. Question 10