Device and method for treating refractory pollutants through electrocatalytic oxidation

Abstract

The invention relates to a device for treating refractory pollutants through electrocatalytic oxidation. The device comprises a housing and a conducting material, wherein the whole housing is cylindrical; the conducting material is arranged close to the inner wall of the housing, and is also cylindrical as a cathode; a beta-PbO2 catalyst layer-loaded conducting filter element as an anode is fixed at the center of the device; a layer of permeable partitioning net wraps the outside of the conducting filter element; conducting granular materials are fully filled between the permeable partitioning net and the cathode; the cathode and the anode are connected to a negative electrode and a positive electrode of a constant-current constant-voltage power supply separately; a water inlet is formed in the center position at the bottom of the device; and a water outlet is formed in the upper end of the conducting filter element. According to the device, the degradation efficiency of the refractory pollutants can be improved, meanwhile, the energy consumption is reduced and refractory organic wastewater can be efficiently and economically treated. The invention further relates to a method for treating the refractory pollutants through electrocatalytic oxidation by using the device.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a device and method for electrocatalytic oxidation treatment of refractory pollutants. Background technique [0002] The chemical structure of refractory pollutants is stable, and most of them have certain biological toxicity. They will exist in the environment for a long time and accumulate in organisms, eventually endangering human health. For the treatment of refractory pollutants, advanced oxidation technology has unique advantages. Advanced oxidation technology uses different methods to generate hydroxyl radicals (OH), which have extremely strong oxidation ability (2.80V), and can non-selectively oxidize most organic substances into carbon dioxide and water. Advanced oxidation technologies mainly include ozone oxidation, Fenton oxidation, electrochemical oxidation, supercritical water oxidation, photocatalytic oxidation, ultrasonic oxidation, wet catalytic oxidation, etc. Am...

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Problems solved by technology

The ozone oxidation process has the disadvantages of complex ozone generation equipment, low ozone yield and utilization rate, high treatment cost, and incomplete degradation. In order to achieve emission standards, it is often necessary to add catalysts or couple with other processes

However, the Fenton oxidation method needs to be carried out under acidic conditions, and additional acid and chemicals are required, and the effluent after the reaction contains a large amount of Fe. 2+ And generate a large amount of iron-containing sludge, thus restricting the further development of the Fenton method in the field of sewage treatment

[0007] Electrocatalytic oxidation technology has the advantages of high controllability of oxidation conditions, thorough decomposition of organic matter, easy operation, and environmental friendliness. It is an advanced oxidation technology with great development potential, but the current efficiency is still low.

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