Ultraviolet light hydrogen peroxide catalytic oxidation device and process

Abstract

The invention relates to an ultraviolet light hydrogen peroxide catalytic oxidation device and a process thereof. The device comprises a chemical mixing tank communicated with an MBR water outlet, a stirring device is arranged in the chemical mixing tank, and a liquid injection port for adding hydrogen peroxide is formed in one side of the upper portion of the chemical mixing tank; wherein a pipeline is arranged below the chemical mixing tank and is communicated with an ultraviolet oxidation reactor, a wastewater injection port is formed below the ultraviolet oxidation reactor, and a producedwater outlet is formed above one side surface, opposite to the wastewater injection port, of the ultraviolet oxidation reactor. A water treatment ultraviolet lamp used in the invention adopts ultraviolet light (with the wavelength of 185-254nm) with high light energy density and higher excitation energy, and is beneficial to generating more hydroxyl radicals in a reaction system, thereby playing agood role in degrading COD. The ultraviolet oxidation reactor is a plug flow reactor, water can be continuously fed and discharged, and the treatment efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an ultraviolet light hydrogen peroxide catalytic oxidation device and a process thereof. Background technique [0002] After biochemical treatment of wastewater, most of the residual COD is refractory organic matter, which brings great difficulty to COD degradation, and it is difficult to decompose by conventional methods. [0003] At present, the commonly used advanced oxidation processes mainly include Fenton oxidation, electrocatalytic oxidation, iron-carbon micro-electrolytic oxidation, and UV-AOP internal photocatalytic oxidation. These technologies are compared first. [0004] Photocatalytic oxidation: the advantages are 1) mild reaction conditions, strong oxidation ability, and wide application range; 2) the treatment process is very clean, no other substances will be introduced, and no secondary pollution will be caused; 3) it can completely transform organic mat...

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Problems solved by technology

[0005] But the disadvantages are 1) the absorption range of ultraviolet light is narrow, and the utilization rate of light energy is low; 2) it is not suitable for wastewater treatment with a lot of suspended matter and darker chroma

Disadvantages are: 1) large amount of chemicals used, high operating costs; 2) large amount of sludge generated by the reaction, increasing sludge dewatering load; 3) long reaction time; 4) oxidation ability is not too strong, for some refractory organic matter can't handle

[0008] The disadvantages are: 1) The electrode consumption is too large, the current efficiency is low, and the reactor efficiency is not high; 2) The energy consumption is large, and the equipment investment and operating costs are high

[0010] The disadvantages are: 1) the reaction rate is slow; 2) after a period of operation, a passivation film will be formed on the surface of the seasoning, which reduces the processing efficiency; 3) the bed is easy to harden, causing short circuits and dead zones; 4) the amount of iron and carbon supplemented is large; 5 ) under acidic conditions, the amount of dissolved iron filings is large, and there are many sediments produced during addition and subtraction neutralization, which increases the burden of dehydration treatment

However, the wavelength range of ultraviolet light is too large, and the current technology has not studied the influence of ultraviolet light wavelength, and the current ultraviolet photocatalytic oxidation technology generally adopts static treatment method, and the work efficiency is not high

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