Scouring method

A method of removing accumulated solids from outer surfaces of porous hollow fiber membranes, wherein the membranes are situated in a vessel, the method comprising:

• backwashing the membranes with a liquid so as to dislodge accumulated solids from the outer surfaces of the membranes;
• providing, by means other than gas passing through the pores of the membranes, gas bubbles to the membranes, wherein the gas bubbles scour the outer surfaces of the membranes;
• and
• removing dislodged accumulated solids from the vessel.

A method of removing accumulated solids from outer surfaces of porous hollow fiber membranes, wherein the membranes are situated in a vessel, the method comprising:

• backwashing the membranes with a gas so as to dislodge accumulated solids from the outer surfaces of the membranes;
• providing, by means other than gas passing through the pores of the membranes, gas bubbles to the membranes, wherein the gas bubbles scour the outer surfaces of the membranes;
• and
• removing dislodged accumulated solids from the vessel.

A method of removing accumulated solids from outer surfaces of porous hollow fiber membranes, wherein the membranes are situated in a vessel, the method comprising:

• backwashing the membranes so as to dislodge accumulated solids from the outer surfaces of the membranes;
• thereafter
• providing, by means other than gas passing through the pores of the membranes, gas bubbles to the membranes, wherein the gas bubbles scour the outer surfaces of the membranes;
• and thereafter
• removing dislodged accumulated solids from the vessel.