Aeration unit, aeration apparatus equipped therewith and method of aeration

An aeration unit installed in water comprising:

• an air diffuser for producing bubbles;
• a cylindrically-shaped liquid foam generating channel part installed above the air diffuser so that the bubbles can ascend internally;
• a cup-shaped gas retention chamber connected to the upper part of the liquid foam generating channel part;
• and
• a cup-shaped bubble accumulating part installed above the gas retention chamber to have an opening part on the upper face,
• wherein the upper end of the liquid foam generating channel part is disposed inside the gas retention chamber, liquid foam bodies (soap-bubble-like liquid foam aggregate) generated from the bubbles inside the liquid foam generating channel part are exposed to gas inside the gas retention chamber and burst, released into water below the gas retention chamber, thereby generating new bubbles, these bubbles are collected at the bubble accumulating part and fed above from the opening part.