Method and device for preparing hydroxyl radical solution

Abstract

The invention relates to a method and a device for preparing a hydroxyl radical solution, and belongs to the technical field of gas discharge physics and radical chemistry. The method comprises the following steps: switching on a power supply so that a feed gas enters an oxygen plasma producing source for ionization and dissociation to generate an oxygen plasma gas, then introducing a part of the oxygen plasma gas into an oxygen plasma gas concentration detector from the outlet of the oxygen plasma producing source, and introducing the rest oxygen plasma gas into a high-pressure jet device, wherein water is pumped into a filter, then flows into the high-pressure jet device to be subjected to gas-liquid mixed dissolution with the oxygen plasma gas which enters the high-pressure jet device and then flows into a gas-liquid separator for further mixed dissolution, and the oxygen plasma gas which is not dissolved in the water is thermally decomposed into oxygen by virtue of a rest gas remover to be discharged so as to generate the hydroxyl radical solution. The device is provided with the oxygen plasma producing source, the power supply, plasma diagnostic equipment, the oxygen plasma gas concentration detector, the gas-liquid high-pressure jet device, the filter, a pump, the gas-liquid separator, the rest gas remover, a total oxidant TRO detector and a main pipeline.

Description

technical field [0001] The invention belongs to the technical fields of gas discharge physics and free radical chemistry, and relates to a method and a device for preparing a hydroxyl radical solution by injecting gas-liquid miscible oxygen plasma into an advanced oxidation technology. Background technique [0002] With the rapid growth of China's economic GDP at a rate of more than 8% every year, environmental problems are very prominent, and it is facing a serious environmental crisis, which even threatens the survival of human beings, and has seriously restricted my country's economic development, harmonious society construction and people's Improvement of living standards. Among them, toxic organic pollutants are very serious to the environment. This kind of pollutants has the characteristics of large discharge, wide pollution area and difficult to degrade by conventional biochemical methods. Its pollution control has always been a research hotspot in the field of environ...

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Problems solved by technology

[0010] However, the above-mentioned methods for generating hydroxyl radicals have the following problems: 1. The concentration of producing OH is low and the amount of production is small, so it can only be used for experimental research and small-scale applications; 2. The time to generate OH is as long as 1min to 6h; 3. The preparation of OH needs to add a large amount of agent H 2 o 2 and catalysts such as TiO 2 , Fe 2+ (iron salt), etc., there is a high treatment cost, and the use of H 2 o 2 safety and other issues; ④It needs to add huge auxiliary equipment such as high-efficiency bubble tower, rotating packed bed, fluidized bed photocatalysis and impinging flow reactor, etc. to improve the treatment efficiency; ⑤ultraviolet (UV) has poor penetration ability in sewage , it is difficult to apply in engineering, etc.

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