Hazards and treatment of organic waste gas

 Air pollution is one of the most prominent environmental problems in China. A large number of industrial exhaust gas into the atmosphere, the air quality is bound to decline, bring serious harm to human health. The most difficult to deal with the industrial waste gas is the organic waste gas, organic waste gas through respiratory tract and skin into the human body, can give people's breathing, blood, liver and other systems and organs caused temporary and permanent lesions, especially benzopyrene polycyclic aromatic hydrocarbons can make the human body directly carcinogenic, has caused human attention. Industrial production will produce a variety of organic waste gas, mainly including a variety of hydrocarbons, alcohols, aldehydes, acids, ketones and amines, etc., these organic waste gas will cause air pollution, harm to human health, but also will cause waste, so the treatment and purification of organic waste gas is imperative. In the 21st century, with the development of social economy and people's awareness of environmental protection, people put forward higher requirements for environmental quality. At present, the environmental problem is still outstanding, has seriously restricted the economic development and the improvement of people's living standards, including toxic organic compounds to the environment pollution is very serious, the pollutant emissions has big, wide pollution level and the characteristics of difficult to degrade, their pollution control has been the focus of environmental protection worker research topic.

Organic waste gas to the harm of human body is various, different industry organic waste gas of toxicity is also each are not identical, including industrial waste gas of 10 kinds of common organic waste gas main performance is: the harm of human body benzene class organic damage of central nervous, cause nervous system disorders, when benzene vapor concentration is too high (in the air content of 2%), can cause fatal acute poisoning. Polycyclic aromatic hydrocarbons (pahs) have strong carcinogenicity. Benzoic acid organics can deform or solidify cell proteins, resulting in systemic poisoning. The poisoning of nitrile organic compounds can cause dyspnea, severe suffocation, loss of consciousness and death. Organic nitrobenzene affects the nervous system, blood, liver and spleen functions, and can cause death in large areas of skin absorption. Aromatic amine organic carcinogenic, diphenylamine, benzidine into the human body can cause hypoxia. Organic nitrogen compounds can cause cancer. Organophosphorus compounds reduce the activity of cholinesterase in the blood, resulting in nervous system dysfunction. In organic sulfur compounds in waste gas treatment equipment of granulator, low concentration of mercaptan can cause discomfort and high concentration can cause death. In organic compounds containing oxygen, inhalation of high concentration of ethylene oxide can cause death. Acrolein has strong stimulation to mucous membrane. Amyl alcohol can cause headache, vomiting, diarrhea and so on. Oil refining, storage, printing, paint, chemical industry, organic raw materials and synthetic materials, pesticides, dyes, paint and other chemical products, coking, fixed burner oil refining process, chemical products production process that leaks and evaporation in storage facilities, waste water evaporation of the organic matter, organic matter in printing ink, coating evaporation, disinfectants, such as pesticide dye processing of organic matter in the process of evaporation, incomplete combustion in the garbage incinerator, Fried, Fried, grilled foods in catering mobile source emissions from cars, ships, aircraft crankcase air leakage。

　  At present, the purification method of the lower concentration of the gas phase pollutants in China is mainly the adsorption method, the application of the strong adsorption of activated carbon adsorption pollutants, and the dynamic change of the mass concentration of organic waste gas has a better buffer regulation. Printing machine waste gas treatment equipment manufacturers commonly used adsorbents are porous carbon materials, cellular activated carbon, spherical activated carbon, activated carbon fiber, new activated carbon and molecular sieve, zeolite, porous clay ore, activated alumina and silica gel. Activated carbon is powder or granular, most cases can not be directly used in a variety of purification equipment, must make activated carbon has a certain shape and support strength to use. After special processing, activated carbon can produce abundant microporous structure, these invisible micropores can rely on molecular forces, adsorption of various harmful gas and liquid molecules, so as to achieve the purpose of purification. The adsorption process of activated carbon includes adsorption purification and thermal desorption. The process of adsorption and purification is to send the organic waste gas into the adsorption bed by the exhaust fan. The organic waste gas is adsorbed by the adsorbent in the adsorption bed to purify the gas. The purified gas is discharged to the atmosphere to complete the purification process. The process of thermal desorption and regeneration is that when the adsorbent adsorbed organic matter in the adsorption bed reaches the permitted adsorption capacity, the adsorption bed is no longer able to carry out adsorption operations and is transferred to desorption and regeneration. Desorption and regeneration means that the adsorbent is purged by hot air from the catalyst so that the adsorbent can be desorbed to achieve the purpose of recycling the adsorbent's adsorption capacity.