Method and device for preparing hydroxyl radical solution

A free radical, solution technology, applied in chemical instruments and methods, special compound water treatment, water/sludge/sewage treatment, etc., can solve the problems of poor UV penetration, high treatment cost, low concentration, etc., to achieve optimization Miscible process mode and parameters, improving gas-liquid mass transfer efficiency, and the effect of short time

Active Publication Date: 2015-02-18
XIAMEN UNIV
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AI Technical Summary

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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  • Method and device for preparing hydroxyl radical solution
  • Method and device for preparing hydroxyl radical solution
  • Method and device for preparing hydroxyl radical solution

Examples

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preparation example Construction

[0040] Provide the concrete steps of the preparation method of hydroxyl radical solution below:

[0041] 1) Start the high-frequency high-voltage power supply 2, which applies an external excitation power to the oxygen plasma generator, and the raw material gas enters the oxygen plasma generator 1 through the polytetrafluoroethylene pipeline for ionization and dissociation. The strong ionization discharge that occurs in the discharge gap of the micro-fluid and the micro-glow alternately cooperates. The characteristic physical parameters of the atmospheric pressure ionization discharge, such as discharge power, critical electric field strength, high-energy electron occupancy, etc., can be used by Stark broadening method and fiber optic spectroscopy. Measure and control the plasma diagnostic method combined with numerical simulation; the concentration of the generated oxygen plasma, especially O 2 + , can be adjusted by the external excitation power of the high-frequency high-v...

Embodiment 1

[0079] Adjust the discharge power at 100~400W, O 2 The intake air volume is 3.0L / min, and different concentrations of oxygen plasma gas are obtained. The water flow rate is 6-12L / min, and different concentrations of total oxidant (TRO) can be obtained after the oxygen plasma gas is injected into the water. Under the premise of not changing other experimental conditions, 750mL of water samples containing the capture agent 4-HBA with an initial concentration of 1mmol / L, a water body temperature of 15°C, and a pH of 7 were passed through the system, and 150mL of the resulting sample solution was filtered through 0.22μm After membrane filtration, HPLC is used to analyze the content of 3,4-DHBA, which is calculated by measuring the difference of total organic carbon TOC before and after the reaction. OH oxidizes 4-HBA and mineralizes it into CO 2 amount. The content of OH is calculated indirectly by the generation of 3,4-DHBA The amount of OH is related to the mineralization into...

Embodiment 2

[0087] Energy consumption test of hydroxyl radical solution preparation device.

[0088] The amount of OH generated by the hydroxyl radical generator is 25 to 50 m 3 / h, the total flow of water to be treated in the main pipeline is 400~500m 3 / h. Externally commissioned Dalian Energy Saving Technology Service Center to test the energy consumption of OH generators and the production of hydroxyl solution, and the Modern Analysis Center of Dalian Institute of Chemical Physics, Chinese Academy of Sciences to test the concentration of total oxidant (TRO) to calculate the energy consumption per ton of water treated and cost. The test results are shown in Table 2.

[0089] Energy consumption of OH generating device: power quality analyzer (model: FLUKE 435-II, accuracy level 0.5), detect voltage, current, power factor and electric energy at the power input terminal of OH device.

[0090] ·OH solution generation: intelligent electromagnetic flowmeter (model: LDBE-80, precision gra...

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/72
CPCC02F1/72C02F2305/023
Inventor 白敏冬张芝涛白敏菂郑琦琳
Owner XIAMEN UNIV
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