Analysis and Prospect of the hottest organic waste

Analysis and Prospect of organic waste gas treatment technology

at this stage, the treatment of organic waste gas in waste gas is the difficulty of treatment. This paper analyzes the basic content of organic waste gas treatment technology, focuses on several organic waste gas treatment technologies, and comprehensively analyzes several new organic waste gas treatment technologies in the future development, so as to ensure that the level of waste gas treatment can be effectively improved. Chinese Library Classification Number:

1 basic overview of organic waste gas treatment technology

according to the composition of different waste gases, relevant operators have obtained a variety of technologies suitable for the treatment of organic waste gases after years of analysis and research. According to the basic form of removing organic waste gases, there are mainly two technologies for the treatment of organic waste gases, which are concentration, recovery and decomposition. First, concentration and recycling actually refers to the use of adsorption, absorption, separation, condensation and other technologies to concentrate and recycle low concentration organic waste gas. Second, decomposition and elimination is actually based on electricity, light, plasma, catalyst and other technologies to decompose plasma, so that volatile and low concentration organic waste gas can be decomposed to form carbon dioxide, water and other substances, so as to realize the role of detoxification. When organic waste gas treatment technology is actually applied, including thermal combustion, adsorption, catalytic combustion and other conventional treatment technologies, with the progress and development of science and technology, a variety of new technologies gradually appear. At this stage, although there are diversified technologies for treating organic waste gas, all treatment technologies have certain limitations and applicability. Different components of organic waste gas will also lead to different treatment 3 heat aging performance technologies

2 several organic waste gas treatment technologies

2.1 activated carbon adsorption method

adsorption generally refers to the gas or liquid acting centrally on the solid surface, and activated carbon has the basic function of adsorption. According to the different adsorption mechanism and the selection of adsorption materials, the adsorption methods mainly include physical and chemical adsorption. Chemical adsorption is mainly to treat organic pollutants by using water dispersing bonds, such as using phenolic resin as adsorbent to treat dimethyl phthalate and other substances in organic waste gas. The chemical adsorbent is suitable for the removal of aqueous pollutants when it is actually applied, but it has not been reasonably applied in the treatment of organic waste gas, mainly because the gas and adsorbent do not have enough contact time and cannot react fully, so that it cannot meet the actual design effect. In practical application, physical adsorption materials, such as zeolite and activated carbon, are generally used to treat organic waste gas. This structure has relatively large specific surface area and relatively strong physical adsorption capacity, which can meet the basic needs. After a lot of practice, it can be found that compared with particle adsorbent and honeycomb adsorbent, fiber adsorbent has higher mass transfer rate, so it is suitable to use fiber adsorbent in the actual treatment of organic waste gas. This method is suitable for the treatment of ground solubility pollutants lower than 200mg/m3, and the acidic environment has more obvious advantages than the alkaline environment. It is suitable for operation at room temperature. If there is too high temperature, cooling equipment should be used to reduce the temperature at this time to ensure the activated carbon with the best state

2.2 absorption method

absorption method is actually a liquid absorption method. The application mechanism is mainly to fully contact the absorbent and waste gas. The absorbent can absorb harmful substances in time, and then remove the waste gas in the organic waste gas by connecting the absorption process. The absorbent should be obtained in time, so that the absorbent can be recycled. At this stage, the absorption principle is used to treat the spray equipment in the waste gas treatment device. Generally speaking, physical absorbents are based on the similarity between substances, such as methanol, acetone, ether and other absorbents. Water is suitable for the situation that it is easily soluble in water, but can not deal with substances with poor water solubility. At this time, chemical adsorption technology is suitable. The basic application principle of this technology is mainly the reaction between organic waste gas and adsorbent surface groups. According to the actual situation of the current application of absorption method, it can be found that, In the process of domestic research, the treatment effect of the same solvent absorption method in organic waste gas treatment is mainly analyzed. Water, surfactants and organic solvents are the main absorbents, and new environmental protection absorbents should also be applied

2.3 catalytic oxidation combustion method

this treatment technology is suitable for the treatment of toxic gases without recycling value, such as VOCs waste gas treatment, oxidation method is the most effective way. The principle of catalytic oxidation combustion method is mainly that oxygen and VOCs are oxidized to form carbon dioxide and water. The oxidation process is similar to the combustion process, and finally carbon dioxide and water that do not pollute the air can be obtained. The operation is carried out according to catalytic oxidation technology and thermal oxidation method. First, thermal oxidation method is heating up to ensure the lowest treatment temperature in the reaction. Second, catalytic oxidation. This technology is actually to reasonably add different catalysts, such as PD, Pt and other metal catalysts, oxidants and organic pollutants to the reaction without affecting the pressure and temperature, so as to appropriately reduce the reaction temperature. Catalytic oxidation combustion method has a very wide range of applications, involving catalytic reaction, environmental engineering, chemical engineering and other disciplines, but there will still be some problems in the actual research. Research and development of high-performance, low-cost catalysts, in order to reduce costs, improve anti-virus ability, prolong service life, research and development of functional, environmental protection and other equipment. It is suitable for the treatment of pollutants with a concentration of 2000-6000mg/m3. If it is as high as 180 ℃, pollutants with a concentration lower than 2000mg/m3 can also appear. If sulfur exists in the exhaust gas, this method is not suitable

3 development prospect of organic waste gas treatment technology

3.1 biofilm method

people use natural microorganisms and other organic organisms to treat waste that can show experimental curves in real time, which is an excellent treatment technology. Using biofilm technology to treat organic sewage has a long history, but the technology of purifying organic waste gas and industrial production is in the development stage. At present, the domestic technology of analyzing and studying the treatment of organic waste gas by biofilm technology is still in the theoretical stage and cannot be widely applied in practice, but all sectors of society have begun to attach great importance to this technology, which has good prospects and is also a hot topic of research. When biofilm technology is used to treat organic waste gas, microorganisms are generally used on the surface of porous media to treat the polluted gas in the packed bed, which can remove most of the pollutants, and there will also be degradation reactions. Porous microorganisms can consume organic pollutants to a certain extent and degrade them to form neutral salts, carbon dioxide, water and other substances, but most of them are low-end products. When this method is applied, it has the advantages of low investment, low cost, simple equipment, no secondary bench operation and y-axis secondary pollution. At present, there have been centralized and different purification systems, such as biological scrubbers, biological filters, etc. It is suitable for application in waste gas with high pollution concentration, small purification gas volume, low metabolic rate and easy volume

3.2 plasma decomposition method

this treatment technology is mainly based on the plasma decomposition technology to decompose organic waste gas in chlorofluorocarbons. At present, it has been widely used in industrial production, and it can decompose in a short time. At the same time, it does not need to strictly require the scale of equipment. This technology can be applied to both small and large equipment. The operation of plasma decomposition technology includes two subsystems. The first is that the plasma can be rapidly heated according to high-frequency plasma to ensure that the temperature can rise to 10000 ℃ in a short time. At this time, the system can be decomposed in an ultra-high temperature environment. The chemical reaction between water vapor and plasma is the basic principle of decomposing organic waste gas. Second, in fact, according to the plasma subsystem, the synthetic dioxin exhaust quenching system can be avoided, and the temperature can be reduced to below 80 ° C

4 Conclusion

to sum up, the level of organic waste gas treatment will seriously affect the atmospheric environment. After industrial development, the emission of organic gas in the atmosphere has been greatly changed, and the related problems of environmental treatment need to be solved urgently in the future development