| 摘要 |
PROBLEM TO BE SOLVED: To provide a desalination method and apparatus which can efficiently and stably perform reverse osmosis membrane filtration for a long period of time.SOLUTION: A desalination apparatus comprises: a filtration membrane 10 which removes soluble organic substances and suspended matter in raw water; a filtrate tank 20 which stores filtrate; a reverse osmosis membrane module 30 which desalts the filtrate; a filtrate pipe 22 which sends the filtrate from the filtrate tank 20 to the filtration membrane 10 as washing water; a reverse osmosis membrane permeate pipe 31 which sends reverse osmosis membrane permeate from the reverse osmosis membrane module 30 to the filtration membrane 10; flow control valves 23 and 32 which are provided to the filtrate pipe 22 and the reverse osmosis membrane permeate pipe 31, respectively; a washing waste water pipe 11 which draws washing waste water used for washing the filtration membrane 10; a residual chlorine analyzer or oxidation-reduction potentiometer 40 which measures the residual chlorine or oxidation reduction potential of washing wastewater; and a control system 50 which controls the flow control valve 22 or 32 based on the residual chlorine concentration or oxidation reduction potential measured by the residual chlorine analyzer or oxidation-reduction potentiometer 40. |
