VOCs treatment mainly involves harmless treatment of volatile substances (such as tar, phenol water, sulfur, etc.) in gasification, and comprehensive treatment is carried out from the source investigation, process control, tail gas treatment, etc. During operation, in order to prevent the volatilization of odors, we control external emissions by maintaining a slight negative pressure at the emission end. Then, volatile substances are separated from the gas through condensation, filtration, adsorption, and photodegradation. Finally, the purified odorless substance is discharged into the air or reused.