**5. Outlook of the Di**ff**erent Kinds of Technologies**

Different kinds of VOCs were emitted from different parts of pharmaceutical production processes. With the new VOCs discharge standards coming into force, it is critical for the pharmaceutical companies to eliminate VOCs exhaustively in China. According to the production processes and conditions, the suitable VOCs elimination technologies must be selected with the highest efficiency and at the lowest cost. Adsorption, absorption, incineration, catalytic combustion, biodegradation, and non-thermal plasma technologies have been applied in factories for the abatement of VOCs. Adsorption and absorption are commonly the first used methods to recycle useful VOCs. Then, the rest of the VOCs were decomposed by other technologies, such as incineration, catalytic combustion, non-thermal plasma, biodegradation, and non-thermal plasma. The key point for the improvement of catalytic combustion and non-thermal plasma is the development of efficient catalysts or packed bed materials. Some new technologies are emerging for the abatement of VOCs, such as photocatalysis and electron beam radiation. These new technologies have shown good potential for the elimination of VOCs with a high efficiency and low energy cost. However, they still have some engineering problems for the industrial application. It is important to develop VOCs elimination technologies to decrease the amounts of VOCs in the discharged waste gas. The final solution for the VOCs is avoiding the emission of VOCs from the whole pharmaceutical production processes by developing new chemical and engineering technologies for the production of medicine.

**Author Contributions:** L.Z. has written the main content of this paper. C.M. has added some new research papers of this topic and summarized the catalysts used in different researches. J.H. has improved the English writing of the whole paper and written parts of photocatalysis parts. R.L. has written the parts of VOCs elimination policies in China and improve the structure of the paper. J.Y. has designed the whole structure of the paper and improved the manuscript a lot. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the Scientific Technology Research Program for the University in Hebei Province Youth Project (No. QN2020126).

**Acknowledgments:** The authors gratefully acknowledge the help of Jing Wang and Ping Chen from Tianjushi Engineering&Technology Group Co., Ltd. who gave us a lot of suggestions about the VOCs treatment technologies and policies in China. The authors gratefully acknowledge the help of Rose Amal for the help of improvement the parts of catalytic processes for the treatment of VOCs.

**Conflicts of Interest:** The authors declare no conflict of interest.
