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Yangjiang Xinhuan Water Service Co., Ltd. was established in 2010 as a holding enterprise of the group, with a total investment of 130 million yuan and a registered capital of 40 million yuan. It has invested, constructed, and operated four sewage treatment plant projects in Yangjiang City, including Gaoxin, Yinling, Chengnan Phase I, and Chengbei Phase I, through BOT for 26 years, with a daily treatment capacity of 50000 tons.

The PPP project for the expansion and upgrading of the Chengbei Sewage Treatment Plant (Phase II) is located on Wangshan Fourth Road, Jinjiao Neighborhood Committee, Chengbei Street, Jiangcheng District, Yangjiang City. The main process of the Phase II expansion project adopts "A/A/O micro aeration oxidation ditch+magnetic coagulation sedimentation tank+ultraviolet disinfection", and the upgrading process is "magnetic coagulation sedimentation tank+ultraviolet disinfection transformation". The total planned land area for the project is 23377 square meters, with a first phase land area of 13147 square meters and a second phase land area of 10230 square meters. The construction scale of the second phase expansion project is 30000 tons per day, and the project cooperation period is 24 years, including a construction period of 1 year and an operation period of 23 years. The first phase of the bidding project was officially put into operation on October 1, 2019, and the second phase of the expansion project was officially put into operation on June 1, 2020. The service scope includes the northern area of Yangjiang City, the Xianke River area, some areas of Hongfeng Town, and the Longtao area.