In recent years, the chemical, pharmaceutical, automobile, oil and gas industries… have been growing with the number of factoriesconstantly increasing. The production process of these factories produce a large amount of emissions contains VOCs. The emission of VOCs into the atmosphere causes environmental problems. Exposure to VOCs can be hazardous to human health.
Where do volatile organic compounds (VOCs) come from? What are these compounds?
VOCs are used in many different industries, and are found in paints, adhesives, pharmaceuticals, cosmetics, refrigerants, fragrance chemicals, gasoline, etc.
VOC are often industrial solvents industrial chemicals such as trichloromethane, dichloromethane, benzene, toluene, xylene, etc. VOCs are found in petroleum fuels, paint solvents, pesticides, etc.
VOCs commonly used in the paint industry include aliphatic hydrocarbon mixtures, alcohols, esters, ketones…
VOCs are an element that makes ozone an environmental pollutant. VOCs will react with sunlight and nitrogen oxides (NOx) to form ozone. This ozone combines with fine dust particles and other materials to form smog. Photochemical reactions under the influence of nitrogen oxide decompose VOCs to create oxidizing agents.
VOC + light + NO2 + O2 O3 + NO + CO2 + H 2
In the above reaction, we also see that the reaction forms a product containing CO2, a gas that causes the greenhouse effect.
Illustration of VOC reaction process
Effects on humans
VOCs can cause immediate or long-term harm to human health. Immediate harmful effects when exposed to VOCs can cause eye, skin and respiratory tract irritation, headaches, dizziness, visual disturbances, fatigue, nausea and weakness. memory.
Prolonged exposure to VOCs affects the liver, kidneys and central nervous system. VOCs can also be cancer-causing agents.
Therefore, VOCs need to be analyzed, evaluated, treated and controlled from sources that emit VOCs into the environment.
Measures to treat exhaust gases containing volatile organic compounds (VOCs)
Exhaust gas containing VOCs is collected in the treatment system through an exhaust hood and brought into the adsorption tower by an exhaust fan.
Here, the VOC adsorption tower will be adsorbed with activated carbon. Exhaust gas is brought up from the bottom of the tower. The tower body has layers of activated carbon to perform the adsorption process. The exhaust gas then continues to be guided through the absorption tower.
At the absorption tower, the exhaust gas stream will be introduced into the device from the bottom and the absorption solution will go from the top down. The absorption solution is pumped from the tank through the nozzle system and sprayed evenly into the absorption tower.
The absorption tower has a two-stage structure corresponding to the treatment process being divided into two stages. At the lower level of the tower, the gas flow and the absorption solution come into contact with each other. Makes small sized dust particles wet and fall down with the liquid stream. At the same time, pollutants will be partially absorbed. The absorption of remaining pollutants will take place in the upper floors of the tower.
The gas flow after leaving the treatment equipment will be clean gas that meets environmental standards
At HASY ENVIRONMENT, we have the appropriate technologies to treat exhaust gases containing volatile organic compounds vapors (VOCs) from industrial processes. For advice on exhaust gas treatment systems containing volatile organic compounds (VOCs), please contact us immediately at 0972221608 or website https://xulymoitruong360.com/
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