Apparatus for the intermittent aeration of liquids

A device for the aeration of liquid in an aeration tank having a water surface comprising:

• a rigid supporting body of random shape bearing an aeration face having first perforations therein, said supporting body having a center of gravity and a periphery being disposed slightly higher than said center of gravity;
• a diaphragm of airtight material covering said supporting body and having second perforations in parts thereof out of register with said first perforations;
• a frame structure adapted for locking said supporting body in a chosen position in said aeration tank;
• an air supply adapted for feeding air into said supporting body and substantially in the center of gravity thereof, through said first perforations so as to enter a deflecting zone adapted to direct said air towards said periphery and to pass that air between said diaphragm and said supporting body with decreasing pressure into said liquid to be aerated.

A device for the aeration of a liquid in an aeration tank having a water surface, comprising:

• a rigid supporting body having an aeration face with a first set of perforations therein, said supporting body having a center of gravity and a periphery being disposed slightly higher than said center of gravity;
• a diaphragm of airtight material covering said supporting body, being sealingly secured around the periphery thereof, and having second perforations in parts thereof out of register with said first perforations;
• and
• an air supply connected to said supporting body and adapted for feeding air into said support body through said first perforations and substantially in said center of gravity, so as to direct said air towards said periphery and to pass that air between said diaphragm and said supporting body and through the perforations in said diaphragm with decreasing pressure into said liquid to be aerated.