In 2021, the second sewage treatment plant in Yiyuan County purchased a 185Kw air suspension fan from Shandong Shuyuan Power Technology Co., Ltd, which runs 360 days a year, 24 hours a day, to supply oxygen to the aerobic tank. 2021 May air suspension fan for start-up, the aeration effect is better than the old sewage plant, dissolved oxygen concentration. At the time of going to press, the air suspension fan of the water plant is running normally.