Abstract

A device in the form of an air distributor container is provided for effecting intermittent aeration of waste water, with several of such containers being arranged beneath the water level and connected with an air intake. Each container comprises a tube-like support and an air distributor foil covering such support and having fine air exit openings therein which are opened during the aeration process by the air introduced through the intake, and which close once the air intake is discontinued. Each container comprises an oval barrel jacket, serving as the support and having upper and lower outwardly arched walls. A plurality of lateral air passage openings are located in the upper wall of the barrel jacket and extend along opposite longitudinal edges thereof. Cover plates air-tightly close opposite ends of the barrel jacket, and one of the plates contains an air intake opening. An elongated tie rod extends axially over the entire length of the container and through holes in the cover plates for securing them in place and for further strengthening the container. The foil is connected to the jacket at its opposite ends in an air-tight manner and is stretched over the upper wall including the air passage openings, with the exit openings of the foil lying inwardly of such openings. Accordingly, an interspace is defined between the foil and the upper wall during air intake as the foil is caused to raise from the barrel jacket to a level higher than the air passage openings.