An aeration device includes a pipe, connection members and a first connection unit which is connected to the connection member. The first connection unit includes a first connector, a first connection part, a one-way member, a second connector, a turbine unit and a shell. When air enters into the pipe, the shell guides the air and liquid in the pound into the turbine unit via the second and third rooms so as to increase the mixing feature of the air and the liquid in the pound.

Underwater gas pressurization units and liquefaction systems, as well as pressurization and liquefaction methods are provided. Gas is compressed hydraulically by a rising pressurization liquid that is separated from the gas by a water immiscible liquid layer on top of an aqueous salt solution. Tall vessels are used to reach a high compression ratio that lowers the liquefaction temperature. The pressurizing liquid is delivered gravitationally, after gasification, transport to smaller water depths and condensation. Cooling units are used to liquefy the compressed gas. A cascade of compression and cooling units may be used with sequentially higher liquefaction temperatures, which allow eventual cooling by sea water. The pressurizing liquid, dimensions of the vessels, the delivery unit, the coolants and the implementation of the cooling units are selected according to the sea location, to enable natural gas liquefaction in proximity to the gas source.

Underwater gas pressurization units and liquefaction systems, as well as pressurization and liquefaction methods and gas field development methods are provided. Gas is compressed hydraulically by seawater introduced into vessels and separated from the gas by a water immiscible liquid layer. Tall, possibly vertical helical vessels are used to reach a high compression ratio that lowers the liquefaction temperature. Cooling units are used to liquefy the compressed gas, possibly by a coolant which is itself pressurized by a similar mechanism. The coolant may be selected to be liquefied under surrounding seawater temperatures. The seawater which is used to pressurize the gas may be used after evacuation from the vessels to pressurize intrastratal gas in the production stages and broaden the gas field development.

An air-powered water circulation system for ponds, lakes, municipal water tanks, and other bodies of water having a draft tube extending along and about a vertical axis between upper and lower end portions and supported by a flotation arrangement with the upper end portion slightly below the water surface. A pneumatic, air flow arrangement is then provided to supply pressurized air from an aft pump to a plurality of submerged air pipes positioned within the draft tube below the upper end portion thereof and extending inwardly from a submerged manifold toward the interior of the draft tube. In operation, pressurized air is supplied from the air pump through an air delivery conduit to the submerged air manifold and into the submerged air pipes where it is discharged as air bubbles through series of discharge holes extending along the pipes to create an overall circulation pattern in the body of water.

This document describes a gas streaming device for use between an injection port and a mixing chamber within an airlift pump, and an airlift pump with the gas streaming device. The gas streaming device includes a planar plate with multiple holes extending therethrough, where the holes are dimensioned to direct the gas into multiple micro-streams for streaming air from the injection port into the mixing chamber. An airlift pump in combination with such a gas streaming device is useful for removing anomalously high concentrations of dissolved gas in a liquid. The increased efficiency for this invention may also enable this type of pump to be economic in other applications where it is desirable to lift a liquid or induce flow.