Filtration membrane cleaning device, filtration membrane cleaning method, and water treatment system

摘要

Ozone gas is dissolved in water to generate ozone water, and the ozone water generation tank (12) that accumulates the generated ozone water and the waste ozone gas of by-products and the filtration unit (5) that filters the raw water are accumulated. Backwashing mechanism for backwashing the filtration membrane (51) with ozone water, membrane surface washing mechanism for washing the membrane surface of the filtration membrane (51) by releasing bubbles containing ozone in the biological reaction tank (4), reverse Prior to the reverse cleaning by the cleaning mechanism, the control unit (30) that controls the operations of the reverse cleaning mechanism and the film surface cleaning mechanism so as to perform the film surface cleaning by the film surface cleaning mechanism, and the gas released as bubbles in the film surface cleaning. The exhaust ozone gas dilution unit for diluting the accumulated exhaust ozone gas and supplying the diluted exhaust ozone gas to the film surface cleaning mechanism is configured.