Three-phase internal circulating photocatalytic reactor

Abstract

The invention discloses a three-phase internal circulating photocatalytic reactor, which comprises a cylinder body, a diversion tube, a quartz socket tube and an ultraviolet lamp, and is characterized in that a diversion cover is arranged in the diversion tube; a settling pond consists of a gas outlet tube of the diversion cover and conical inclined plates which are arranged on the top of the diversion cover; the diversion tube, the diversion cover and the conical inclined plates are fixed with the cylinder body by using a fixing rod; the diversion cover and the diversion tube are made of glass of which the inner wall is plated with mercury; distance between a cover opening of the diversion cover and a lower end opening of the diversion tube is less than or equal to 3 centimeters; and more than four layers of the conical inclined plates are arranged. According to the three-phase internal circulating photocatalytic reactor, waste water enters from a water inlet tube, and is driven by aeration to form internal circulating flowing, and treated water, a catalyst and gas are separated in a three-phase separator to obtain clean effluent. The three-phase internal circulating photocatalytic reactor has the advantages of high utilization rate of a light source, good mass transfer effect of the catalyst, integration of reaction and separation, simplicity of operation and continuous running, is suitable for industrial application and has good economic, environmental and social benefits, the removal rate of pollutants is high during actual running, and the catalyst is convenient to recycle.

Description

field of invention [0001] The invention belongs to the technical field of machinery, and specifically relates to a three-phase internal circulation photocatalytic reactor with high light source utilization rate, good catalyst mass transfer effect and integrated reaction and separation. Background technique [0002] With the continuous development of my country's industrialization, the treatment of industrial wastewater with high concentration, complex components, toxic and refractory substances, and poor biodegradability has become a hot spot in water treatment. For example, petroleum, chemical, pesticide, pharmaceutical, printing and dyeing wastewater, etc., conventional wastewater treatment processes are difficult to achieve stable and efficient treatment, and advanced oxidation methods are generally used for such toxic and harmful wastewater. Among them, TiO2 photocatalytic technology is an efficient deep oxidation process, which can effectively mineralize halogenated hyd...

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Problems solved by technology

[0004] ①The irradiation efficiency of the light source is not high: Some reactors with external light source have low light utilization rate; although the built-in light source can improve the efficiency, in practical application, due to the complex composition of industrial wastewater, high COD and SS, ultraviolet light is The transmittance in this kind of wastewater is very low, and the light intensity decays quickly, so it is difficult for catalysts and wastewater far away from the light source to be excited by light.

[0005] ② The mass transfer effect of catalyst and pollutants is not good: some catalysts are easy to deposit at the bottom of the reactor with ordinary paddle agitator, and the mixing effect is not good

[0006] ③Difficult separation of catalysts and pollutants: Some reactors use an external sedimentation tank to separate catalysts, pollutants and effluent, but this will increase the treatment cost, easily cause secondary pollution, the reaction cannot run continuously, and the treatment efficiency is low

But there are also the following problems: the ultraviolet light in the built-in casing light source decays quickly in industrial wastewater with high SS, and the allowable annular gap width of the reactor is narrow; the bottom aeration makes the catalyst fluidized, but there is no proper deflector to control the flow state , to achieve internal circulation flow; long-term operation of porous sintered plates may lead to blockage, without substantially solving the problem of separation

In the multi-light source three-phase circulating fluidized bed photochemical reactor designed by You Hong et al., the preparation of Fe / inorganic carrier catalyst and its wastewater treatment method (invention patent publication number CN 1994546A), the reactor realizes internal circulation, but only through Setting deflectors to separate solid, liquid, and gas phases will cause mutual interference, and the separation effect is not good; in addition, Fenton’s reagent is used as a catalyst, and the pH must be controlled in acidity, which is prone to iron sludge, which limits its application range

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