The present invention relates to a granular activated sludge granulating method for granular activated sludge, which effectively removes contaminants contained in raw water through a granular sludge containing granular activated sludge and filtration through a movable membrane provided on the granular sludge tank, The present invention relates to a combined water treatment system using sludge and membrane bioreactor and a water treatment method using the sludge and membrane bioreactor. The problem of conventional biological water treatment apparatus not only minimizes membrane contamination, but also prolong membrane washing cycle, can do. In addition, the installation cost is reduced because additional equipment such as an aeration device, pump, piping, and the like is not required to increase the period of use of the membrane cleaning and membrane, and since the membrane is provided inside the granulation tank, Not only can the equipment CAPEX be reduced, but OPEX can also be reduced by reducing energy consumption during system operation.
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