Abstract: A self-contained waste-liquid extraction, aeration and return system including an aspirator having an elongate mixing chamber downstream of the aspiration point and a liquid pump carrying the aspirator in a unit which is independent of the structure or of the liquid circuit of the system to which it is applied.A particularly effective and structurally rugged aspirator is included.

Abstract: The present invention is a system for treating sewage waste commonly called sludge. An aerator shears the solid particles while simultaneously adding oxygen to the sludge. After being pumped through the aerator, the sludge exits into a large tank. The sludge in the tank is continually circulated, drawn from the bottom of the tank and pumped through the aerator. As additional sludge is periodically added, supernatant water is removed through an overflow line of a stilling well in the center of the tank. After a lengthy period of time, part of the sludge in the bottom of the tank will be withdrawn and moved to the drying beds. With some modifications, existing anaerobic systems may be changed to the present aerobic system for a much greater capacity. Entire collection and waste treatment plant facilities may be designed utilizing the aerators at various stages.

Abstract: A self-contained waste-liquid extraction, aeration and return system including an aspirator having an elongate mixing chamber downstream of the aspiration point and a liquid pump carrying the aspirator in a unit which is independent of the structure or of the liquid circuit of the system to which it is applied.A particularly effective and structurally rugged aspirator is included.