The present invention relates to a membrane fouling reduction type sewage treatment apparatus and a method of operating the same, and more particularly, to a membrane fouling reduction type sewage treatment apparatus and method for treating a membrane fouling by introducing particulate matter together with air into the membrane separation vessel, The present invention relates to a membrane fouling reduction type sewage elevation treatment apparatus and a method of operating the same. The present invention relates to a sewage treatment apparatus for treating sewage, comprising: an anaerobic tank for phosphorus discharge and organic matter removal of the sewage; An anoxic tank for denitrification and organic matter removal of the sewage; A membrane separation tank including a membrane for nitrification, organic oxidation and solid-liquid separation of the sewage; Aeration means for injecting air to impinge air on the membrane to said membrane separation vessel; And particulate material injecting means for injecting particulate matter that may collide with the membrane together with the air injected by the aeration means into the membrane separating tank.
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