Advanced treatment device and method for dejectas collecting wastewater in high-speed train

Abstract

An embodiment of the invention provides an advanced treatment device and method for dejectas collecting wastewater in a high-speed train. The device comprises an electrochemical-ozone composite catalysis unit, an ozone-activated carbon secondary catalysis unit, an ozone generation unit and an ozone detection unit, wherein the electrochemical-ozone composite catalysis unit comprises a barrel-like titanium-based coating anode, a catalyst filling type stainless steel aeration cathode and a pulsed direct-current power supply; the ozone generation unit adopts a low-energy-consumption plate type ozone generator and a micro-nano bubble generation device to reinforce ozone mass transfer. The dejectas collecting wastewater in the high-speed train is treated by the composite catalysis unit and the secondary catalysis unit sequentially, efficient, rapid and safe treatment of routine indexes and novel drug type pollutants in the dejectas collecting wastewater is realized, and treated effluent meets reuse requirements. The advanced treatment device and method have the characteristics of high yield of hydroxyl radicals, high oxidizing capacity, concise structure, modular design, easy popularization and the like and can be used for pretreatment or advanced treatment of refractory organic wastewater.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to an advanced treatment device and method for waste water collected by high-speed railways. Background technique [0002] Water pollution caused by high-speed railway operation is an important environmental problem to be solved in the leap-forward development of my country's high-speed railway. As we all know, after more than ten years of development, my country has become the country with the most complete high-speed rail system technology, the strongest integration capability, the longest operating mileage, the highest operating speed, and the largest scale of construction in the world. By the end of 2015, the total scale of high-speed railways in my country had reached more than 40,000 kilometers, basically covering cities with a population of more than 500,000, and the operating mileage of railways reached 18,000 kilometers, accounting for more than 60% of the wor...

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Problems solved by technology

[0007] Wang Yujue and others took the lead in combining electrochemistry with peroxide (O3 / H2O2) reaction, and the oxygen in the ozone / oxygen mixed gas generated by the ozone generator was placed on the carbon electrode (air diffusion cathode: prepared by carbon black-polytetrafluoroethylene material) ) The surface of the electrode is electrochemically reduced to hydrogen peroxide, and then undergoes ozone catalytic reaction (O3 / H2O2) with ozone to generate a large number of hydroxyl radicals, so it has the characteristics of strong oxidation ability and no secondary pollution. The carbon black used in this process - Polytetrafluoroethylene electrodes are usually two-dimensional flat electrodes, which are not only easily limited by mass transfer, but more importantly, the electrodes are poor in stability, easy to pulverize, expensive, and difficult to apply on a large scale

In addition, the process oxidation occurs in the cathode area, and the anodes used in the system are mostly platinum anodes, which have weak oxidation ability and low contribution to the removal of pollutants.

Since then, Wang Kaijun and others have invented a device and method for pipe-type electrocatalysis and ozone synergistic oxidation treatment of sewage (CN104326530 A), which uses a mesh barrel-shaped cathode and anode, wherein the cathode is a flat carbon electrode, which not only has limited ability to generate H2O2, Also highly susceptible to mass transfer

More importantly, in previous studies, the aeration device, the anode and the cathode are independent of each other and have a certain distance. The gas needs a long mass transfer distance from the inside of the aeration device to the electrode surface and the resistance is huge. In addition, the solubility of ozone is low, so In the past, the reaction process of the electro-ozone device was often limited by mass transfer and diffusion, which affected the operation of the system

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