Method for preparing hydroxyl radicals by hydrodynamic cavitation coordinated with high concentration active oxygen

Abstract

The invention provides a method for preparing hydroxyl radicals by hydrodynamic cavitation coordinated with high concentration active oxygen and belongs to the technical field of gas discharge and environmental protection application. According to the method comprises the following steps: high-concentration active oxygen containing active particles such as O3, O2<+> and O2<-> is produced in a large scale in a mode of barometric pressure micro-flow and micro-glow alternately form discharge by adopting a zoning excitation type barometric pressure panel plasma reactor array; the high-concentration active oxygen is effectively injected into water with a high mass transfer efficiency by a hydrodynamic cavitation gas-liquid mixing technology; and when the high-concentration active oxygen is fully mixed and dissolved in water, the reaction of converting active oxygen to hydroxyl radicals is carried out efficiently under the driving of transient high temperature and high pressure generated by the hydrodynamic cavitation effect and existence of hydroxyl radicals is maintained by means of a hydroxyl radical chain reaction so as to produce the hydroxyl radicals in a large scale. The invention provides the method for preparing hydroxyl radicals by hydrodynamic cavitation coordinated with high concentration active oxygen for application of advanced oxidation water treatment projects.

Description

technical field [0001] The invention belongs to the technical field of gas discharge and environmental protection applications, and relates to an advanced oxidation technology method, in particular to a method for preparing hydroxyl radicals by hydrodynamic cavitation and high-concentration active oxygen. Background technique [0002] Water pollution is one of the severe environmental problems that China has to solve at present. Every year, more than 60 billion m 3 Untreated sewage is directly discharged into water bodies, causing pollution of rivers and lakes in our country. 75% of the country's lakes have been eutrophicated to varying degrees, and 90% of the urban waters are seriously polluted; a survey of groundwater in 118 large and medium-sized cities in my country shows that 115 cities have polluted groundwater, of which about 40% are heavily polluted. For a long time to come, water pollution will be an urgent environmental problem to be solved in our country. [00...

AI Technical Summary

Problems solved by technology

[0012] To sum up, the current methods for generating hydroxyl radicals have the following problems: the concentration and yield of hydroxyl radicals are low, and only experimental research and small-scale applications can be carried out; the time to complete the biochemical reaction is as long as 15 to 360 minutes; The base needs to add a large amount of chemicals, the production cost is high, and there are potential safety hazards; it needs to add huge auxiliary equipment such as high-efficiency bubble towers, rotating packed beds, fluidized bed photocatalysis and impinging flow reactors, etc.; there is a lack of dedicated equipment for preparing hydroxyl radicals. equipment, it is difficult to realize the engineering application of water pollution control

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