Membrane module and membrane bioreactor, water treatment equipment using the same

A hollow fiber membrane module comprising:

• a hollow fiber membrane bundle consisting of a plurality of hollow fiber membrane filaments having a first end and a second end,
• an air inlet pipe;
• a first end part coupled to the first end of the hollow fiber membrane bundle and the air inlet pipe
• wherein the first end of the hollow fiber membrane bundle is cast in the first end part to form a first cast end part of the hollow fiber membrane bundle and a first near cast end part of the hollow fiber membrane bundle that is immediately adjacent to the first cast end part;
• and
• a first air distributing device coupled to the air inlet pipe and affixed to the first end part proximate to the first near cast end part of the hollow fiber membrane bundle, comprising
• air distributing holes opened towards the first near cast end part of the hollow fiber membrane bundle to direct flow from the air inlet pipe onto the first near cast end part of the hollow fiber membrane bundle;
• wherein an end surface of the first end part is a protruded end surface protruding in a direction towards a middle of the length of each of the hollow fiber membrane filaments, and the protruded end surface is of a truncated cone shape or prismoid shape;
• and
• wherein when the hollow fiber membrane module is vertically placed, the air distributing holes are positioned at a bottom of the protruded end surface away from the middle of the length of each of the hollow fiber membrane filaments and the air distributing holes are opened towards a top of the protruded end surface, wherein the top of the protruded end surface is closer to the middle of the length of each of the hollow fiber membrane filaments than the bottom of the protruded end surface to the middle of the length of each of the hollow fiber membrane filaments.