Discussion on the progress of volatile organic was

2022-08-14
  • Detail

Brief discussion on the progress of volatile organic waste gas treatment technology

Abstract: volatile organic waste gas (VOCs) belongs to a kind of harmful gases, its boiling point is very high, and the boiling point of VOCs is at a higher temperature, and the saturated vapor pressure of organic waste gas is higher than 133.3. Researchers at the Plekhanov University of economics in Moscow reported in the new issue of the Dutch Journal of polymers and environment that PA, Reaching such conditions may produce volatile organic compounds, which will affect air quality and cause harm to human health. Based on this, this paper expounds the importance of organic waste gas treatment, and discusses and analyzes the current volatile organic waste gas treatment technology and its progress, in order to improve the level of volatile organic waste gas treatment

key words: organic waste gas treatment; importance; volatility; Governance technology; Progress

with the improvement of industrialization, the increase of industrial exhaust emissions leads to increasingly serious environmental pollution, which seriously affects people's health and hinders the development of the national economy. This requires strengthening the treatment of organic waste gas, and reasonable application of some effective treatment technologies. In order to give full play to its role, the progress of volatile organic waste gas treatment technology is discussed and analyzed below

first, the importance of organic waste gas treatment

at present, environmental pollution has become a global problem, among which air pollution is one of the most prominent problems, and industrial waste gas is an important source of air pollutants. 1. Gear wear testing machine. The exhaust gas from the preparation machine before the experiment is the most difficult part of industrial exhaust gas. This gas can cause serious damage to people's health and cause serious losses to the national economy. If the human body is exposed to organic waste gas for a long time, it will be absorbed into the body through the human or skin through the respiratory system, causing damage to the liver, nerve and hematopoietic system. The symptoms mainly include dizziness and headache, nausea and vomiting, palpitation and asthma, fatigue and weakness, hemogram changes, etc., and there are serious "teratogenic, carcinogenic and mutagenic" hazards to human body and animals. Therefore, people pay more and more attention to the treatment of organic waste gas, which has become one of the focuses of air pollution treatment

II. Analysis of current volatile organic waste gas treatment technology

1. Apply catalytic combustion to treat volatile organic waste gas. Applying catalytic combustion to treat volatile organic waste gas is to add a catalyst during the combustion of waste gas. The purpose of using catalyst is to reduce the ignition point of VOCs, so that VOCs can be fully burned, so that VOCs can be burned to produce CO2 and H2O, which can be discharged into the air. At present, there are many kinds of catalysts used in the market, mainly divided into noble metal (such as Pt, PD) and non noble metal (such as Ti, Fe, Cu, etc.) catalysts. When the noble metal catalyst reacts with VOCs, it has strong fusion with the organic matter of chlorinated hydrocarbons, which makes the noble metal catalyst and VOCs prone to catalytic decomposition. If we compare catalytic combustion with direct thermal combustion, we can see that their respective advantages are different. The combustion temperature of catalytic combustion method only needs to be maintained at 200 ℃ - 400 ℃, and catalytic combustion is carried out at a lower temperature, which avoids the production of NOx secondary pollutants and is more environmentally friendly. However, the stability of the catalysts we use at present is not high, and they are easy to be destroyed by substances containing s, P, as and so on under some specific conditions. Once the activity of these catalysts is destroyed, the catalytic performance will be reduced. In order to carry out sufficient chemical reactions, new catalysts need to be replaced, resulting in higher treatment costs

2. Apply direct combustion to treat volatile organic waste gas. Using direct combustion to treat volatile organic waste gas is to connect VOCs directly to the boiler that can be incinerated. When the concentration of VOCs we connect is high, it can be fully burned in the furnace, and CO2 and H2O can be generated through combustion chemical reaction. If the concentration of VOCs connected to the boiler is low, it will not be fully burned. We need to add auxiliary fuel, so that VOCs can be completely burned, and eventually CO2 and H2O will be generated, In this way, the produced CO2 and H2O can be directly discharged into the air. This direct combustion method has the advantages of low investment cost and simple equipment. However, this direct combustion method needs to maintain a high combustion temperature, and NOx compounds will be produced under such a continuous high temperature, causing the second pollution to the air

3. Apply biological law to treat volatile organic waste gas. The application of biological rule of law to treat volatile organic waste gas is to treat VOCs through biofiltration. The organic waste gas treated by this method mainly comes from industrial production, municipal sewage, sludge treatment, etc

biofiltration can treat VOCs with low concentration. Through the treatment effect of the core biofilter, VOCs are reacted through the biofilm filler in the biofilter. In this way, VOCs can be adsorbed and reacted by the organisms on the biofilm in the filter bed to produce CO2 and H2O, so that the generated CO2 and H2O can be directly discharged into the air

4. Apply adsorption method to treat volatile organic waste gas. The application of adsorption method to treat volatile organic waste gas is to use an adsorbent with microporous structure to adsorb the toxic substances of volatile harmful gases on the surface of the adsorbent, so as to separate the organic substances from the main body. It should be pointed out that there is a big gap between China and developed countries in the governance of VOCs. The above governance methods can only adapt to the governance of medium and high concentrations of VOCs, and the governance effect of low concentrations of VOCs is not obvious. Therefore, for the innovative research on the governance technology of VOCs in China, scientific and technological workers need to actively develop new technologies, so as to bring benefits to human health and avoid the harm of VOCs to human beings

III. progress analysis of volatile organic waste gas treatment technology

the progress of volatile organic waste gas treatment technology is mainly shown as follows: (1) microwave catalytic oxidation technology. Microwave oxidation technology integrates the advantages of filler adsorption technology, air purification technology and desorption technology, and successfully transforms the traditional treatment technology into modern microwave oxidation technology. When using microwave oxidation technology to treat organic waste gas, it can effectively reduce the time required for desorption and adsorption, reduce the consumption of energy costs, and avoid unnecessary waste. In addition, another advantage of microwave oxidation technology is that the cost is low, that is, it is economical. Even after repeated and continuous use for more than 20 times, it still has a good adsorption effect. At the technical level, it is similar to the principle of sewage treatment technology, and only a little modification can improve the treatment effect of volatile organic waste gas. (2) Activated carbon fiber. Different from the commonly used carbon adsorption technology, activated carbon fiber technology provides a basis for industry management and scientific decision-making. It is novel and has better adsorption effect. The principles applied to activated carbon fiber treatment technology are: activated carbon has the characteristics of strong adsorption, and does not harm the surrounding environment. Its internal and external surfaces are full of adsorbable carbon atoms, which form a surface structure with good adsorption, and can meet the requirements of volatile organic waste gas treatment. Superior to traditional carbon adsorption materials, activated carbon has a special chemical and physical structure, slightly better in adsorption speed, adsorption capacity and carbon content. (3) machine size, and can be used repeatedly. The advantages of activated carbon fiber technology make it achieve good results in the treatment of volatile organic waste gas, which is worthy of being widely promoted. (3) Biological treatment technology. The use of biological treatment technology is actually the biodegradability of microorganisms in Li Yongle's volatile organic waste gas, and then the microorganisms in the organic waste gas are metabolized into inorganic substances. However, the degradation method of biological treatment technology is inevitable, and unpredictable harmful substances may be produced again. This is different from the application of biological treatment technology in wastewater, but with the help of its application characteristics in wastewater, the volatile organic waste gas can be liquefied, and the pollutants in it can be adsorbed and degraded in liquid state. The effect is better than that in gas phase state, The production of harmful substances can be avoided as far as possible, but the technology of biological treatment of volatile organic waste gas still needs in-depth research to form an overall system. (4) Nano material purification technology. Nano material is a kind of super fine material. The grain size is usually nanometer, the surface area of nano particles is large, and there are more active centers than ordinary materials. It can have a higher conversion rate in the treatment of volatile organic waste gas. In addition, nano catalysts can convert substances that do not have the ability to react into substances that have the ability to react. In particular, the particle size of nano-TiO2 is very small, ranging from 1nm to 100nm, which has a significant effect on waste gas treatment. TiO2 can convert the organic substances in the exhaust gas into inorganic substances such as water and carbon dioxide under good lighting conditions. It has more prominent advantages in indoor air purification and has unlimited application prospects

conclusion

to sum up, volatile organic waste gas has a wide range of transmission, many sources of pollution, great harm, and brings great harm to people's production and life. Therefore, it has attracted more and more attention, and the selection and application of treatment technology need to pay attention to its timeliness. At present, volatile organic waste gas has become a stubborn disease of environmental pollution. Therefore, in order to control volatile organic waste gas, we must strengthen the analysis of the progress of volatile organic waste gas treatment technology

References:

[1] Chen Zheming, Xia Youchao, shaoxiaolin. Progress analysis of volatile organic waste gas treatment technology [j] Resource conservation and environmental protection, 2015

[2] Zhang Jiangang et al. Progress analysis of volatile organic waste gas treatment technology [j] Chemical management, 2017

Copyright © 2011 JIN SHI