An internal circulation photocatalytic oxidation combined treatment device

Abstract

The invention discloses an internal recycle photoelectron-catalytic oxidation combined treatment device. According to the treatment device, a water inlet (2) is formed in the bottom of a treatment device cylinder (1) and is communicated with a circular water distributor (3); wastewater is uniformly distributed to the bottom of the device through the circular water distributor (3); a photoelectron-catalytic oxidation combined treatment system (4) is arranged above the circular water distributor (3); a sediment mud bucket (5) is arranged under the circular water distributor (3) and is communicated with a mud discharge hole (6); under the condition that a direct-current power supply is loaded to the photoelectron-catalytic oxidation combined treatment system (4), the wastewater is lifted to the top of the device from the bottom of a photoelectron-catalytic oxidation unit (7); part of the wastewater is discharged out from a water outlet (9) in the upper part of the device; another part of the wastewater is further circulated to the bottom of the photoelectron-catalytic oxidation unit (7) through a central partitioning cylinder (8) and is mixed with water, then circulation of the wastewater inside the photoelectron-catalytic oxidation combined treatment system (4) is achieved, mud dregs generated from reaction can be discharged out from the mud discharge hole (6) at regular time, and generated tail gases can be discharged out from a top tail gas treater (10).

Description

technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and relates to a wastewater treatment technology, in particular to an internal circulation photoelectric catalytic oxidation combined treatment device. Background technique [0002] With the continuous improvement of my country's industrialization level, industrial water consumption continues to increase, industrial production processes such as petroleum refining, chemical product production, etc. produce a large amount of industrial wastewater, which often contains a large amount of artificially synthesized refractory organic pollutants such as benzene, biphenyl Such substances generally have the characteristics of stable structure, high toxicity, and long biodegradation cycle. Once discharged into water bodies, they will cause serious pollution to the surface water environment. Industrial wastewater treatment technology can be used as an important means of this type ...

AI Technical Summary

Problems solved by technology

As an advanced oxidation treatment technology, photocatalytic oxidation technology generates a large number of strong oxidizing groups in the system through photocatalysis on the surface of the plate, such as hydroxyl radicals, so that the pollutants in the wastewater are decomposed into carbon dioxide and water, and the pollution of pollutants is realized. The rapid and effective removal of photoelectric catalytic oxidation technology for advanced treatment of industrial wastewater has the characteristics of strong oxidation, no selectivity to pollutants, short reaction time, etc., but there are also some technical problems, mainly as follows: 1) light source utilization The efficiency and photocatalytic activity of the plate are low, and the outside world interferes greatly with the light source system, which reduces the number of photogenerated electrons in the system, which in turn affects the removal capacity of system pollutants; 2) The recombination rate of photogenerated electrons and holes is high, resulting in low photocatalytic oxidation efficiency , resulting in poor removal of pollutants; 3) The photoelectric catalytic oxidation system is prone to "concentration polarization" phenomenon, especially when the concentration of pollutant substrate is low, the pollutants cannot diffuse in time, resulting in a significant drop in photocatalytic oxidation efficiency , the energy consumption increases, and the treatment cost increases; 4) For benzene and biphenyl substances with relatively stable structures, it is difficult to achieve complete decomposition and oxidation of refractory pollutants through the photocatalysis of the polar plate, and the removal effect is poor; 5) The polar plate The anti-pollution property is poor, and the surface of the plate is easy to scale. After a long time of operation, the coating will fall off, the service life of the plate will be reduced, and the water quality and system operation stability will be affected.

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