Abstract: An apparatus for aerating water contained at a dam site includes a force main pipe for receiving water from a dam site water reservoir therethrough and a dam aeration assembly in communication with the force main pipe. The dam aeration assembly, via an array of aerators, aerates water delivered from the force main pipe and introduces the aerated water into a dam site discharge waterway.

Abstract: The present invention is a gas scrubbing system for removing hydrogen sulfide gas from a wastewater system. Pumps draw wastewater from a wastewater source within the system for injection through aerators which aerats aspirate hydrogen sulfide gas and oxygen from the wastewater source. The aerators mix the wastewater with the hydrogen sulfide gas and oxygen which is returned to the system as oxygenated wastewater containing elemental sulfur. The water and sulphur are then delivered to the treatment plant for final treatment.

Abstract: This invention relates to a process for making a lightweight article which involves the steps of: (1) feeding a thermoplastic resin composition into an extruder, wherein the thermoplastic resin composition contains (a) from about 94 to about 99 weight percent polyethylene terephthalate, and (b) from about 1 to about 6 weight percent of at least one polyolefin; (2) mixing an inert gas into the thermoplastic resin composition in the extruder while the thermoplastic resin composition is in the molten state; (3) extruding the thermoplastic resin composition containing the inert gas through a sheet forming die to produce a substantially amorphous cellular sheet which contains a sufficient amount of inert gas cells to provide the cellular sheet with a density which is within the range of about 0.4 to about 1.25; and (4) thermoforming the cellular sheet in a heated mold to produce the lightweight article. Dual-ovenable trays and other types of food containers can be made utilizing the process of this invention.

Abstract: The invention provides for a process for inducing immediate high slip properties in a silicone modified, unorientated polyester. The process comprises heating the polyester film, article, etc., in a fluid at a temperature of from about 70.degree. C. to about 200.degree. C.

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.