Water, water everywhere, and what a drop to drink!
Print Edition
THE new Chedun Town Water Plant, with a capacity to treat 40,000 cubic meters a day, has gone into full operation, completing a six-year project to create an integrated system providing quality tap water to the residents of the Songjiang District.
“The water quality is so much better than before,” said Lu Deyong, 58, a farmer in Pengjia Village, Maogang Town. “It even tastes a little sweet.”
Since the end of last year, residents in Maogang have been able to drink quality tap water that has been run through advanced treatment processes at the Xiaokunshan Water Plant.
Same price, same quality
Years of “same price, different quality” water for Songjiang farmers and urban residents are now history, thanks to the integrated system providing the same high quality of water to everyone.
The project not only provides good, safe drinking water but also uninterrupted services. If water contamination occurs in any part of the system, the culprit pipes are by-passed and clean water is provided from elsewhere in the system.
The Songjiang tap water project has meant the closure of old town-level water plants and the construction of new advanced treatment plants. Some regional plants were overhauled and upgraded.
Construction began on the Xiaokunshan Water Plant, which treats 200,000 cubic meters of water a day, in 2008. It became the first advanced water treatment plant of its kind in the suburbs of Shanghai.
“The biggest problem we had was the upgrading of district-level plants,” said Tao Ming, an engineer at the Songjiang Water Utility Co.
The No.2 Songjiang Water Plant was one example.
To turn it into an advanced treatment plant required at least 6,667 square meters for the requisite pumping stations, ozone contact reactors, activated carbon filtering tanks and a substation.
Refitting the water plant
However the No. 2 plant was located in a downtown area and there was no available land nearby. So experts sat down to solve the problem. After studies and long evaluation, they finally came up with a Plan B.
An open space in the middle of the old plant was used to install ozone contact reactors. A third of the space occupied by an old sedimentation tank was used to build activated carbon filtering tanks, and the sedimentation tank itself was refitted with sloped tubes to lower water turbidity.
In the end, the revamped plant didn’t need any additional land, and the internal improvements actually saved up to 75 percent on electricity.
The integrated tap water project, involving such a large area and such complicated geological structures, faced no end of hurdles. One of the biggest headaches was installing pipes across the Huangpu River.
The Xietang, Hengliaojing and Huangpu rivers and numerous canals divide the district into southern and northern segments. With a “pipe dragging” technique, seven water pipes were installed about five meters above the river bottom, successfully carrying clean water from the north to the towns of Shihudang, Xinbang, Maogang and Yexie in the south.
The seven pipes together are 3,748 meters long, with the biggest 70 millimeters in diameter. In fact, the Songjiang project created a record number of pipes crossing the Huangpu in the Shanghai area.
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