NOVELTY - Wastewater treatment method involves carrying out intermittent aeration process by performing aeration process of aerobic tank (2) which processes to-be-processed water with activated sludge, setting time for not aerating aerobic tank, performing optimal time calculation process of calculating optimal aeration time based on dissolved oxygen of liquid phase of aerobic tank in aeration process, and performing optimal aeration process of performing aeration process in optimal aeration time obtained at optimal aeration time calculation process.    USE - Wastewater treatment method (claimed).    ADVANTAGE - Membrane fouling is reduced, and wastewater treatment capacity and power saving effect can be improved.    DETAILED DESCRIPTION - Wastewater treatment method involves carrying out intermittent aeration process by performing aeration process of aerobic tank (2) which processes to-be-processed water with activated sludge, setting time for not aerating aerobic tank, performing optimal time calculation process of calculating optimal aeration time based on dissolved oxygen of liquid phase of aerobic tank in aeration process, and performing optimal aeration process of performing aeration process in optimal aeration time obtained at optimal aeration time calculation process, and performing membrane separation process of separating liquid phase of aerobic tank into solid and liquid by separation membrane (3). An INDEPENDENT CLAIM is included for wastewater treatment equipment (1A) comprising aerobic tank (2) which processes to-be-processed water with activated sludge, membrane separation tank (4) provided with separation membrane (3), water quality measurement unit (5), and control part (6).    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the wastewater treatment equipment. (Drawing includes non-English language text).    Wastewater treatment equipment (1A)    Aerobic tank (2)    Membrane (3)    Membrane separation tank (4)    Water quality measurement unit (5)    Control part (6)