How to treat chemical waste gas? For chemical waste gas, the first step is to determine the main components of the waste gas, and then according to the composition of which to develop different processes. Currently there are many methods of waste gas treatment, but there is no single method can be completely dealt with, because each process has its own advantages and disadvantages, so the current chemical waste gas treatment is generally a combination of several processes to deal with the following with the Everest blue editorial take a look at the chemical waste gas treatment methods are.
Chemical waste gas combustion method
The combustion method is mainly divided into direct combustion and catalytic combustion according to the temperature of combustion and different auxiliary media.
Catalytic combustion method is more suitable for high concentration, small air volume of chemical waste gas purification, in the treatment of low concentration of waste gas, because of the need to maintain the catalytic combustion temperature of 300 ~ 400 ℃, with the help of activated carbon adsorption and other enrichment processes to improve the combustion calorific value of the waste gas, but the chemical waste gas of the water and gas, oil and particulate matter can easily cause the decline in the capacity of the activated carbon adsorption and the catalyst poisoning inactivation and other topics, making the promotion and use of this method is limited to some extent. The use of this method is limited to a certain extent.
Direct combustion method is to add auxiliary fuels and chemical waste gas together into the incinerator combustion, direct incineration process is mature, control a certain temperature under the premise of pollutant removal efficiency, incineration, but in the process of using the general will have the following questions:
① If the incineration of chlorine-containing, bromine-generating organics and aromatic hydrocarbons is very easy to produce dioxin-like strong carcinogenic substances, especially in the incinerator start-up and closed process is more likely to produce, in order to avoid the production of dioxin-like substances, must progress in the combustion temperature of more than 1,200 ° C. If you keep the combustion temperature as high as not only high operating costs, but also on the incinerator's requirements have also been greatly improved.
② incineration of chlorinated organic matter will produce hydrogen chloride erosion, especially at high temperatures, hydrogen chloride erosion function is greatly enhanced, not only the existence of pipeline erosion, more serious is to cause the erosion of the incinerator.
③ incineration there is a latent danger of explosion, especially volatile combustible gases, if it reaches its explosive limit in case of open flame may cause an explosion.
In addition, if the exhaust gas contains halogens, nitrogen and sulfur elements, combustion method is very easy to produce secondary pollutants dioxins, nitrogen oxides and sulfur oxides.
Chemical waste gas oxidation method
This method mainly uses chlorine, ozone, hydrogen peroxide, permanganate and other strong oxidising agents to destroy the pollutant molecules, with the advantages of fast reaction and simple treatment device. The disadvantage is that the purification efficiency is not high, and it is difficult to control the dosage of oxidant.
Chemical waste gas absorption method
The use of physical and chemical properties of pollutants, the use of water or chemical absorption of chemical waste gas absorption removal method. The method in the design of fair operation of the removal efficiency is very high, the operation of the management is convenient, but the equipment and operation of the management requirements *, and only can be dissolved in the absorbing liquid or can react with the absorbing liquid of the pollutants can be effectively removed.
Chemical waste gas adsorption method
This method is when the pollutant passes through the adsorption tower equipped with adsorbent (e.g. activated carbon, hydrophobic molecular sieve, etc.), the adsorbent's strong adsorption of pollutants is utilised so as to achieve the purpose of purifying the waste gas. This method is simple equipment, good removal effect, mostly used in the purification process of the final treatment. The disadvantage of this method is that the high concentration of chemical waste gas treatment efficiency is low, covers a large area, gas resistance, adsorbent often need to be replaced or regeneration and other shortcomings, and adsorbent desorption of the gas is difficult to collect and zui finally discharged back to the atmosphere, is a kind of solution to the problem is not complete.
Chemical waste gas biological treatment
Biological method is a treatment process in recent years more research, the method zui highlights the advantages of low processing costs, basic no secondary pollution. Biological method is certainly effective in purifying low concentration of organic pollutants, has the advantage of low energy consumption, but there is a large gas resistance, slow degradation rate, equipment volume is huge, susceptible to the concentration of pollutants and the influence of temperature, and the method is only used for hydrophilic and easily biodegradable substances, the hydrophobicity and difficult to biodegradable substances are still difficult to deal with.
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Guangdong Public Security Bureau No. 44190002006305
