Process and device for treating water by fluidized bed type suspension and photocatalytic oxidization in built-in depositing separation area

Abstract

A system for treating industrial sewage has fluidized bed type reactor with forced circulation. Said reactor is divided into reaction region and deposition separating region. Said reaction region is the lower part of reactor and is divided into central and peripheral areas. Multiple ultraviolet lamps are arranged in reaction region. The lower part of reactor has water inlet. The deposition separating region and water outlet are positioned at upper part of reactor. Its advantages are high reaction speed and treated water capacity, easy operation, reuse of catalyst, and continuous running.

Description

technical field [0001] The invention belongs to the technical field of water treatment methods and devices using photocatalysts, and in particular relates to photocatalytic oxidation treatment methods and devices suitable for water containing refractory organic matter. Background technique [0002] In recent years, with the development of industry and economy, many discharged water containing toxic and harmful substances that are difficult to biodegrade have continuously entered the environment, causing great harm to industrial and agricultural production, people's lives and human health. How to effectively dispose of these polluted water has become a hot spot in the field of environment. Photocatalytic oxidation technology is a newly emerging advanced oxidation technology, because it has (1) the ability to completely mineralize organic matter into CO which is almost harmless to the environment 2 、H 2 O and mineral acid; (2) It can oxidize almost all organic substances wit...

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Problems solved by technology

[0005] There are following defects in the above-mentioned reactor: (1) this reactor is a batch reactor, and it is very inconvenient to operate; (2) a feature of the plate reactor is exactly that the catalyst is fixed on the surface of the plate, which greatly reduces the available The specific surface area of ​​the catalyst used in the catalytic reaction greatly reduces the removal rate of pollutants in the reactor; (3) the flat-plate reactor mostly uses the sun light source, because the intensity of the sun light varies significantly with seasons, weather and time, giving the reaction (4) The proportion of ultraviolet rays that can trigger photocatalytic oxidation reactions in sunlight is very low (about 4%), which greatly limits the speed of the reaction

Due to the above reasons, the practical application of photocatalytic oxidation technology has been greatly restricted.

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