Labyrinth type current-crossing and bubbling photocatalytic reaction device and method for treating organic waste water thereby

Abstract

The invention relates to a labyrinth cross flow bubbling light-catalyzed reaction device and the method for treating organic wastewater. It is characterized in that the reactor is equipped with a labyrinth liquid passage formed by parallel baffle plate, gas containing oxygen entering from bottom of reactor into distributing plate and bubble into reacting area, organic wastewater flows from liquid inlet pipe on upper of distributing plate and reactor side face, flows in labyrinth reacting area along baffle plate and contacts with rising bubble, and the particular light catalyst floats in gas and liquid mixing phase. The light catalystic reaction proceeds among gas, liquid and solid reacts phase under irradiation of ultraviolet light from upper side of reactor, the organic matter is degraded, the yielding water is separated through outer solid-liquid separator and the light catalytic reaction is continous proceeded under pump action. The invention is characterized by simple construction, convenient operation, long liquid retention time for thorough contact time of liquid and solid, high mass transfer efficiency and light catalytic reaction efficiency, no limit from light source for reactor design enlargement and easy for industrial application.

Description

technical field [0001] The invention relates to a high-efficiency photocatalytic reaction device and its organic wastewater treatment method, in particular to a labyrinth cross-flow bubbling photocatalytic reaction device and its organic wastewater treatment method technical background [0002] Photocatalytic oxidation technology uses ultraviolet light or near ultraviolet light to activate semiconductors (usually TiO 2 ) The photogenerated holes on the valence band generate hydroxyl radicals with strong oxidizing ability in water, which completely mineralizes organic pollutants that are difficult to degrade in water. The degradation process can be carried out at normal temperature and pressure and the substrate is almost non-selective , In addition, this method does not need to add chemical reagents and has no secondary pollution, so it has become the research frontier and development hotspot of current water purification technology at home and abroad. [0003] Reactor, lig...

AI Technical Summary

Problems solved by technology

At present, researchers generally use an annular fluidized bed reactor with a built-in light source to achieve this purpose, but this type of reactor needs to be equipped with an internal cooling system to dissipate heat, and the combination of the light source (ultraviolet lamp) and the cooling system must be considered when designing and scaling up. It is complex and reduces the effective volume of the reactor. The light energy needs to pass through the multi-layer cooling jacket to reach the surface of the catalyst, and the light efficiency has not been maximized. See the patent publication No. CN1261056; A flat-plate reactor with an external light source, but this reactor has problems such as small waste water treatment, low light energy utilization rate, low reactor efficiency and difficult catalyst recovery and regeneration. See patent publication numbers CN1431155 and CN1508073

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