| 摘要 |
PURPOSE:To improve the quality and stability of the produced water in the salt-to-fresh water distallation by using a two stage reverse osmosis membrane apparatus consisting of a preceding and a succeeding stage, by dividing the succeeding stage reverse osmosis membrane apparatus into two parts, and adjusting the electric conductivity of the transmitted water in one of the two parts. CONSTITUTION:The seawater F1 is sent into a preceding stage reverse osmosis membrane apparatus 2 through a pretreatment apparatus 1, and the transmitted water T1 is stored in a pit 3. The concentrated water is sent to a turbine-driven pump 4. The water F21 fed from the pit 3 is sent to the first succeeding stage reverse osmosis membrane apparatus 6 by the pump 4, and the transmitted water T21 is sent to a succeeding stage pit 8. The water F22 fed from the pit 3 is sent to the second succeeding stage reverse osmosis membrane apparatus 7 by a motor-driven pump 5, and the transmitted water T22 is sent to the pit 8. The electric conductivity of the produced water in the pit 8 is detected by an electric conductivity control meter 9, and the motor-driven pump 5 is started when the detected value becomes higher than the set value. The motor 5 is stopped when the detected value becomes lower than the set value, and a part of the transmitted water T1 in the pit 3 is sent to the pit 8 through a pipe 10 by overflowing to keep the electric conductivity of the produced water constant.
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