Abstract—The paper proves the feasibility of using the
ultrafiltration combined with reverse osmosis to desalt sea water
in Bohai Bay over four-month pilot running. The results show
that the influent quality is not influenced by the UF effluent
quality and the optimum operational parameters are the flux 62.5
L/m2 .h, the quality of UF permeate was excellent, with turbidity
measured below 0.13 NTU and 94% of the SDI15 below 3.0. The
ultrafiltration membrane could feed water into the reverse
osmosis systems sequentially and steadily, and the salt rejection
of reverse osmosis membrane was above 99.1% and stable during
the experimental time. Therefore, this method can be used to
provide clean materials for multipurpose development of the
seawater due to being simple process and low-cost investiment.