Abstract

It goes back for 25 years in 1972, low pressure reverse osmosis (RO) membrane was developed in USA. Since that time, this low pressure RO membrane has been made rapid progress in producing of semiconductor-grade water in Japan. On the other hand, in USA and Europe, the low pressure RO membrane has been greatly developed for desalination of brackish water and refinement or condensation in food processing.Later we will explain the latest information of the low pressure composite RO membranes, especially in respect of the forefront of the ultra low pressure RO membrane which was developed for saving the energy and in respect of the module for food processing or vessel structure.

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