Microwave photocatalytic wastewater degradation reactor expansion method with strong resistance to catalyst agglomeration

Abstract

The invention relates to a capacity expansion method for a microwave photocatalysis waste water degradation reactor capable of powerfully resisting catalyst agglomeration, belonging to the technical field of waste water treatment. The objective of the invention is to overcome the following serial problems in the prior art: the link of interception of a catalyst is weak, a single tank of a reactor has small treating capacity, frequency of repeated operation is high, intensity of internal liquid circulation is insufficient, ozone is not fully utilized, time of a degradation reaction endpoint is hard to distinguish, catalyst agglomeration products cannot be powerfully dispersed in situ, etc. The method mainly comprises the following steps: defining a microwave irradiation area; bunching rising bubble flows and guiding the bunched bubble flows to a key degradation reaction area; carrying out stage-by-stage interception on a catalyst particulate by using an external cascaded three-stage backwashing filter; powerfully dispersing catalyst agglomeration products in situ by using supersonic waves from the bottom of the reactor and incidentally cleaning a quartz tube; and monitoring a reaction process by using an ozone sensor, driving a power supply control mechanism by using a sensing electric signal and turning off a related power supply when a degradation terminal point is arrived.

Description

technical field [0001] The invention relates to a method for expanding the capacity of a microwave photocatalytic wastewater degradation reactor that strongly resists catalyst agglomeration, 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...

AI Technical Summary

Problems solved by technology

[0038] 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