Jiangsu Zhenhu sewage treatment plant, located in Suzhou City, Jiangsu Province, has a designed treatment capacity of 40000 cubic meters of sewage per day. After the completion of Zhenhu sewage treatment plant, the urban water environment has been greatly improved, which plays a very important role in pollution control, water quality protection and ecological balance of the local river basin. At the same time, it plays a positive role in improving the investment environment of Suzhou and realizing the sustainable economic and social development of Suzhou. The waste gas produced by the waste water in the sewage plant area is treated by the waste gas purification equipment of Fengjing environmental protection. The low-temperature plasma purification equipment is used to crack the waste gas molecules. After the industrial waste gas is cracked, the cracking molecules are reduced to carbon dioxide and water by the photodegradation equipment. It provides an integrated solution to the problem of enterprise exhaust gas.