Device and method for photochemical treatment of wastewater containing cr(vi)

Abstract

A photochemical treatment device and method for wastewater containing Cr(VI), the aforementioned photochemical treatment device for wastewater containing Cr(VI) includes a serpentine tube, a light source and a light source control system, and a light guide hole is opened in the curved section of the serpentine tube, and a light guide hole is opened in the curved section of the serpentine tube. In the straight section, two monitoring holes spaced apart by a certain distance are opened and a light sensing device is installed; when the photochemical reaction starts, the power of the light source is adjusted so that the light intensity at the monitoring holes is within the preset range. During the photochemical reaction process, according to the monitoring holes The distance from the light guide hole, the distance between the two monitoring holes, and the detected changes in the light intensity at the two monitoring holes are used to calculate the light intensity at the monitoring holes caused by changes in the sediment coverage at the beginning of the reaction. Increase or decrease the value, and adjust the power of the light source accordingly to keep the light intensity at the monitoring hole within the preset range. The above-mentioned photochemical treatment device for wastewater containing Cr(VI) has higher overall efficacy and operational reliability than traditional photochemical reaction devices, and is more suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, in particular to a photochemical treatment device and method for wastewater containing Cr(VI). Background technique [0002] Chromium generally exists in two stable valence states, Cr(VI) (hexavalent chromium) and Cr(III) (trivalent chromium). Among them, Cr(VI) is a highly toxic heavy metal pollutant, containing Cr(VI). ) There are many treatment technologies for wastewater. Among them, the photocatalytic method uses photocatalysts to catalyze the reduction of Cr(VI) to Cr(III) under the irradiation of light, and then adjust the pH to form precipitation to remove Cr(VI). Photocatalytic removal of Cr(VI) is considered to be a promising, energy-saving and environmentally friendly green treatment method. [0003] Most of the existing photochemical reaction equipment are similar to those in Chinese patent document CN107073433A figure 1 In the structure shown, a transparent...

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Problems solved by technology

Since the light source is concentrated in the center of the reaction chamber, and the sewage has multiple components, the transparency is poor at the initial stage of the reaction, and the light intensity difference between the center and the edge of the reaction chamber is obvious. Luminous power, which in turn will lead to too high light intensity at the center of the reaction chamber, and too high light intensity sometimes leads to reduced photochemical reaction efficiency and waste of energy, and the overall efficiency of the equipment is low

In addition, as the sewage reaction process continues, a layer of deposits will gradually form on the surface of the transparent casing, resulting in a decrease in the light transmittance of the casing. For industrial production equipment, the reaction tank cannot be used like an experimental instrument. Made of transparent glass, it is often difficult for workers to directly observe the deposition on the surface of the casing, and it is easy to reduce the reaction effect due to untimely sediment cleaning. Therefore, the reliability of traditional equipment in the photochemical reaction process needs to be improved.

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