Microwave photocatalytic coupling type waste water degrading device with reinforced catalyst interception procedure

Abstract

The invention relates to a microwave photocatalytic coupling type waste water degrading device with a reinforced catalyst interception procedure and belongs to the technical field of waste water treatment. The existing microwave photocatalytic degradation technology of industrial waste water containing organic pollutants has such problems as weak catalyst interception procedure, small single-tank waste water treatment capacity of reactor and insufficient general circulation strength of internal liquid, and the like, and the scheme is used for integrally solving the problems under the condition of taking the coupling action into account. In the scheme, a metal cage is spanned near the periphery of a quartz tube provided with an electrodeless ultraviolet lamp in the reactor to constrain the microwave in a limited space, so as to greatly expand the design volume of a non-microwave irradiation space to greatly improve the single-tank treatment capacity; a horn-shaped member used for reinforcing liquid circulation is spanned right below the metal cage; an external cascaded three-level back wash filter is used for precisely intercepting catalyst particles; and the material selection of the filter element is not limited.

Description

technical field [0001] The invention relates to a microwave photocatalytic coupled wastewater degradation device with enhanced catalyst retention link, belonging 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 particles inside the liquid. The electrodeless ultraviolet lamp is covered and protected by a quartz tube....

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Problems solved by technology

[0029] The CN102260003A scheme pumps air into the quartz tube containing the electrodeless ultraviolet lamp to achieve the purpose of ventilation, cooling and cooling of the electrodeless ultraviolet lamp, and the air flowing through the quartz tube will be partially transformed due to the irradiation of ultraviolet rays. Therefore, the air flowing out of the quartz tube is of course air containing some ozone. This scheme transmits the ozone-containing air to the microporous aeration head located below the reactor, and releases it from the microporous aeration head. During the bottom-up rise of these ozone-containing bubbles, the ozone contained in it will encounter the organic molecules encountered in the journey and undergo a redox reaction. Of course, this redox reaction will consume part of the ozone. There is no doubt about it. However, as mentioned above, as the scheme shown in CN102260003A, many factors that cannot be ignored inevitably limit its reactor size and limit its actual processing capacity, as clearly shown in its specific examples As indicated, it can only be a small reactor with a single treatment capacity of only about 40 liters in a single tank. In the case of such a small reactor and a small inner cavity, because the overall size itself is very small, then its reaction The longitudinal size of the inner cavity of the device or the depth of filling the liquid can only be a very small size. As clearly shown in its specific implementation, this size is only about 40 centimeters, and the depth of filling the liquid is only about 40 centimeters. 40 centimeters, in fact, the depth of the liquid is of course smaller than this number, so it is analyzed based on the depth of the liquid of 40 cm. Then, what is the concept of the depth of the liquid of 40 cm? That is to say, the path of the ozone-containing air rising through the wastewater is only a short 40 cm. This path is too short, and the ozone-containing air bubbles quickly pass through the water body that is only 40 cm deep. The contact time with the water body is too short. Only a small part of the contained ozone can be used to oxidize and degrade organic matter, while most of the ozone simply passes through the liquid, escapes from the liquid surface and is emptied through the exhaust outlet. Simply put, Most of the oxidation potential of these ozone is wasted, and the escaped and wasted ozone will actually cause unnecessary air pollution; Ozone-containing air is injected into a water storage tank with a depth of one meter. When the water depth reaches one meter, the smell of ozone can still be clearly smelled near the water surface. It can be seen that the liquid depth of 40 cm is obviously not enough. Complete utilization of ozone; it can be seen that for the type of equipment such as infinite ultraviolet photochemical catalytic wastewater degradation reactor, the problem of incomplete utilization of ozone also needs attention. Obviously, people expect more complete utilization of ozone and more polluting exhaust emissions. Few infinite ultraviolet wastewater degradation reactors, this is the sixth problem

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