The new reverse osmosis system was developed for the purpose of elimination of pretreatment facility, that is, cost reduction and without coagulant injection. In order to prevent the accumulation of fine particles inside RO module, following two points are improved ; a.) Improvement of RO element construction b.) Development of washing procedure to be effective for discharge of fine particles in RO module.
Using raw seawater, the improved modules were tested more than two months. The conductivity of permeate was less than 850, μS/ cm and the differential pressure of RO module could be maintained less than 0.05MPa. So it is considered that application of this type of membrane to a small capacity facility for temporary use or for emergency use is practical.
