"There is a lake in the Olympic Green. Maintaining the quality of the water in the lake is also a highlight in the Olympic projects," Ding said.

"We have used the wetland as the bio-purification and some artificial purification technologies to ensure the water quality, which we can draw experience for the future," he said.

Ding, however, admitted that large investment in the initial stage could be the top obstacle to promote these new technologies.

"The foremost obstacle to widely use the new technology is huge spending on setting up the systems, whether it is solar energy system or water recycling system. But the benefits will be unfolded when you use it. The maintenance fee is smaller than the traditional ways," he said.

"The advantage falls on the users," he added.