In a filtration membrane treatment apparatus that performs ozone treatment on the filtration membrane (1), a first supply unit (3) that supplies an ozone-containing fluid to the filtration membrane (1), and a measured value based on the pressure of the filtration membrane (1) ( The supply amount of the ozone-containing fluid supplied by the first supply unit (3) is adjusted based on the change in the measurement value (H) measured by the measurement unit (8) and the measurement value (H) measured by the measurement unit (8). And a control unit (11).
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