Abstract
A new RO system for the large–scaled SWRO plant has been developed in the project named “Mega–ton Water System”with the private–public cooperation in Japan. The characteristics of the newly developed RO system to increase the recovery rate are to use the short vessel that contain 2~4 elements for the first stage, and to use relative-ly long vessel for the second stage after inter booster pump in order to reduce the pressure and the flux of the lead element. The new RO system used by the new low pressure SWRO elements studied by this project is capable of the high recovery rate (under 65%)and allows the scale of the intake and the pretreatment equipment to reduce com-pared to a conventional system. Considering also to the new isobaric Energy Recovery Device (ERD)that has been developed in this project, the energy consumption was estimated and compared the results with that of a conventional system. It is suggested that the reduction of energy consumption is to be about 20% compared with a conventional system.
