VOCs (volatile organic compounds) are the main component of industrial waste gas, which have a great impact on the atmospheric environment and human body, and their sources and components are relatively complex, making it difficult to handle them. Therefore, environmental protection related departments and enterprises pay more attention to VOCs waste gas treatment. In order to improve the VOCs waste gas treatment effect, it is necessary to identify the source of waste gas, fully understand the hazards of waste gas, and then carry out the treatment work. What are the common treatment processes for VOCs waste gas? How can an enterprise choose its own treatment process according to its own actual situation?
On September 2, 2022, the live sharing activity on "Special Sharing of VOC · Pollution Prevention and Control Solutions for Key Industries" hosted by the Environmental Circle Research Society was in full swing. Our general manager, Dr. Mao Xiulin, as the sharing guest, made a live sharing of "VOCs end treatment technology and case sharing", and answered the above questions one by one.

The figure above intuitively shows the approximate range of organic concentration and waste gas flow applicable to different unit treatment technologies. For the exhaust gas flow, the figure shows the maximum processing capacity of a single set of treatment equipment and the relatively economical flow range. When the waste gas flow is large, multiple sets of equipment can be used for separate treatment.
Summary:
For example, Dr. Mao shared during the live broadcast that the most basic elements of organic waste gas treatment are the composition and concentration of waste gas. When selecting the treatment route, it is necessary to consider factors such as air volume, temperature, production conditions, energy consumption, etc., and select the scheme with the highest treatment efficiency and the highest economic benefit.
General principle: in case of high concentration waste gas, the treatment of high concentration and low concentration waste gas shall be separated as far as possible, so as to achieve the goal of maximum treatment efficiency, minimum total emission and minimum energy consumption.
Waste gas with low concentration and large air volume: it is advisable to use activated carbon adsorption, zeolite runner adsorption, air reduction and concentration enhancement and other concentration technologies to improve the VOCs concentration and then conduct purification treatment;
High concentration waste gas: solvent with high value shall be recovered first, but after recovery, secondary waste gas treatment equipment shall be installed at the rear end to meet the emission standard; The concentration is 2000mg-10000mg/m ³ High temperature oxidation technology mainly based on RTO should be adopted for h;
Oil gas (solvent) recovery: condensation+adsorption, adsorption+absorption, membrane separation+adsorption and other technologies should be adopted, but secondary waste gas treatment system is usually required at the rear end;
Odor and odor control: Photocatalysis, photooxidation and other technologies should be used as appropriate;
It is prohibited to spray and absorb the non water-soluble VOCs waste gas with water or aqueous solution;
If disposable activated carbon adsorption technology is adopted, the activated carbon shall be replaced regularly, and the waste activated carbon shall be regenerated or treated;
What are the common end governance portfolio technologies?
High concentration VOCs waste gas generally adopts RTO incineration technology. For relatively complex waste gas components, combined technologies can be used for an effective treatment, such as runner+RTO; Zeolite bed+RTO/CO; Activated carbon adsorption+CO, etc.

RTO technology: oxidize and decompose VOCs waste gas through incineration, and store heat energy through the heat accumulator to save energy consumption for incineration.