Activated Carbon Adsorption Activated carbon adsorption is one of the mainstream technologies for VOCs treatment. It is mature in technology, easy to operate, low in management cost and adaptable to a wide range of applications. It occupies the largest market share in all treatment technologies. In coating, packaging and printing, Chemical, chemical manufacturing, pharmaceutical and chemical and odor control and other fields have been widely used, spraying, packaging and printing companies preferred governance techniques.

VOCs governance, technology is the key

VOCs (Volatile Organic Compounds) have been used as pollutants in our country to start systematic control and prevention. From October 1, 2015 onwards, the petrochemical, packaging and printing industries began to collect VOCs sewage charges.

There are many issues that need attention and discussion about this pollution control industry around the policies and regulations, standards, technologies and engineering practices.

Activated carbon adsorption technology is simple, low cost, is spraying, packaging and printing enterprises preferred governance techniques. However, for a single enterprise, the cost of building a corresponding activated carbon regeneration device is high and it is difficult for local environmental protection departments to reduce the investment burden of VOCs governance in individual enterprises. Organize the construction of a unified activated carbon off-site regeneration system, collect activated carbon after adsorption and conduct centralized regeneration Disposal is a viable and cost-effective model.

"At present, the most widely used VOCs treatment technologies include adsorption recovery technology, adsorption enrichment technology, catalytic combustion technology and high-temperature incineration technology, etc. In addition, the technologies of low-temperature plasma, biological treatment and combination technologies have been rapidly developed." Industry Association, Deputy Secretary-General for Exhaust Gas Management Committee, People's Liberation Army Research Institute Luan Zhiqiang researcher said in an interview.

In general, there are two basic technologies for VOCs treatment. One is recovery technology. The basic idea of ​​treatment is to absorb, filter and separate the VOCs emitted, then purify them and reuse them. Such as adsorption recovery technology, absorption technology and membrane technology. The other is the destruction of technology, the basic idea is to deal with through the chemical reactions such as combustion, the emissions of VOCs decomposition and conversion into other non-toxic and harmless substances. Such as combustion technology, biotechnology and plasma technology. At present, both types of technologies have been studied and applied.

The new adsorption (regeneration) process continues to develop and improve

Adsorption and recovery technology is the most mature, developed a new technology of nitrogen protection and regeneration, reducing the cost of solvent purification; low concentration of exhaust gas purification process using zeolite rotor adsorption; concentrated activated carbon adsorption technology to solve the problem of small business investment costs In the field of VOCs control, solvents (packaging Printing and other industries dissolve dye organic volatile matter) recovery generally has very good economic benefits, so the industry on the adsorption recovery technology has the most, is currently the most mature. Currently, VOCs treatment in many industries uses solvent adsorption and recovery technologies such as oil and gas recovery, packaging and printing, container spraying, petrochemicals, chemical and chemical industries and bulk drug manufacturing.

In recent years, the adsorption process has been continuously improved. Luan Zhiqiang said that in recent years has developed a new nitrogen regeneration technology to avoid the use of water vapor, reducing the cost of recovery of solvent purification, and improve the safety of the equipment, has been a large number of applications, especially in the packaging and printing industry, the most widely used .

In most of the industrial exhaust gases, VOCs are emitted in low concentration and high volume of air. In order to reduce the cost of treatment, it is common to adsorb and concentrate the low-concentration exhaust gas with the adsorbent material first, and then carry out condensation recovery, catalytic combustion or high-temperature incineration treatment. The application of adsorption and concentration technology has developed rapidly in recent years, mainly including fixed bed adsorption and concentration technology and zeolite runner adsorption and concentration technology.

According to the introduction of relevant enterprises, a large number of small-scale enterprises in China are spraying (such as 4S shop spraying) and printing (packaging, printing and book printing) industries. VOCs have low emissions and low emission concentrations, which can not be achieved. Emission standard requirements.

Activated carbon adsorption technology is simple, low cost, is spraying, packaging and printing enterprises preferred governance techniques. However, for a single enterprise, the cost of building a corresponding activated carbon regeneration device is high and hard to be borne.

"All local environmental protection departments are the most viable and low-cost model to reduce the investment burden of VOCs in individual enterprises, organize the construction of a unified activated carbon off-site regeneration system, collect the activated carbon after adsorption, and conduct centralized regeneration and disposal", said Luan Zhiqiang. It is understood that many regions have adopted this model to control VOCs and achieved good results.

Combustion technology is a more effective VOCs treatment technology

The regenerative (catalytic) combustion technology gradually replaces the traditional (catalytic) combustion technology; while the low-temperature plasma technology suddenly emerges but needs to be standardized; the development of biotechnology continues to deepen, and its scope of application is gradually broadened.

When it is not necessary to recycle the organic matter in the exhaust gas, the combustion method is usually used for treatment. Catalytic combustion and high temperature incineration are the most common VOCs combustion control technologies and are the most effective and thorough treatment technologies for VOCs.

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