(811f) Emergency Plan of Nanofiltration Integrated System for Saline Water From Tide of Qiantang River

Qiantang River is the main drinking water source for Hangzhou area in China. Last decade, Hangzhou municipal supply drinking water system were affected seriously in view of the saline water going upstream by the tide in Qiantang River, and the wastewater excessive discharged into the river.

In order to ensure drinking water safety in tidal period, a pilot plant with 500 m³/d of drinking water had been designed and manufactured used nanofiltration integrated technique with ultrafiltration as a pretreatment unit and reverse osmosis as a postreatment unit. The system had been set up in third drinking water company in Xiaoshan and it has been run nearly one year, The demonstration results show that the system is stability, and the quality of drinking water meet the Chinese standards for drinking water. That means this new technique and process can be scale up for the high quality of drinking water especially for where the source of water was slightly polluted.

According to the Qiantang River’s water salinity level, the four emergency response grades for this kind of integrated system were set up. The suitable scale equipment and the response emergency security system for three corresponding drinking water plants respectively were designed due to water salinity by tide of Qiantang River.