As you can see from above image, some workers of No.4 Sewage Treatment Plant which is one of the key projects of Chenzhou city located in Changchongpu village of Suxian district were working hard on the construction of biological pool. It was introduced by the construction party that the project covered with 283mu lands and the total investment for the first phase was about 242million yuan. Currently, 70% of the total project has been completed and its main body project was estimated to be finished in this October and would be placed to trial operation at that time. In this December, it would be placed to operation officially. Its capacity of dispose of sewage is 60000tons/day and the effluent quality well meets national first class A level standard.