The Problems And Solutions Of Secondary Water Supply System In Hangzhou

With the development of social economy,the life quality has been improved and the quality requirement for the secondary water supply is getting higher and higher.However,drinking water is always polluted after getting through the secondary water supply system,and thus the water quality is affected,so the contradiction between the water quality requirement and the current situation has been deepened day by day.In order to improve the quality of secondary water supply,a large amount of analytical investigation has been done by domestic and foreign experts and many suggestions and methods have been put forward.In this article,through the investigation of the secondary water supply in Xiamen,Shanghai,Hangzhou and other domestic cities,the pool(water tank)and pipeline are most easily affected equipment by water pollution,and the pollution is proportional to the time of water staying in the two facilities.Conventional indexes like the residual chlorine in water,p H,total bacterial count are directly affected by the tank material and internal pipe cleanliness.The problems,such as difficulty of charging water fee,unreasonable management,the lack of fund and so on can be found in the management of the secondary water supply.In order to improve the water quality situation of the secondary water supply,through studying the cases about washing pipe network in the east village Zhanongkou and transforming pipe network in Renshou Hill,we proposed to wash pipe network using new techniques and processes like gas-water flushing or improving the water quality of pipe network through transforming it.Through participating in the case oftransforming the pool of Zhuantang pump station,we put forward the method in practice of using cement-based infiltration of crystalline waterproof material lining to replace conventional cement mortar plaster to improve the water quality of concrete pool.The secondary water supply facility can be received and managed by water-supplying enterprises to change the current situation of disorderde management of the secondary water supply,the management aer therefore more professional,water quality is examined more efficiently and the water quality is guaranteed more forcefully.