Provided is a sand setting circulating device for wave-current tank test tailings. A sand collection device is arranged at a front end of a tail gate of a tank body for performing primary collection on a bed-load sand body with a large particle size; a sand-water separating device is arranged at a tail end of the tank body for performing sand-water separation on tail water subjected to energy dissipation so as to perform secondary collection on a suspended load sand body with a small particle size, the sand-water separating device comprising a collection barrel and a sand suction device mounted in the collection barrel; a water outlet is formed in an upper part of the collection barrel, and separated clear water flows into a clear water reservoir through a water return pipe for cyclic utilization; and a computer is arranged for intelligent control.

Provided is a sand setting circulating device for wave-current tank test tailings. A sand collection device is arranged at a front end of a tail gate of a tank body for performing primary collection on a bed-load sand body with a large particle size; a sand-water separating device is arranged at a tail end of the tank body for performing sand-water separation on tail water subjected to energy dissipation so as to perform secondary collection on a suspended load sand body with a small particle size, the sand-water separating device comprising a collection barrel and a sand suction device mounted in the collection barrel; a water outlet is formed in an upper part of the collection barrel, and separated clear water flows into a clear water reservoir through a water return pipe for cyclic utilization; and a computer is arranged for intelligent control.

An apparatus to remove sludge from a reservoir of liquid. A downwardly opening enclosure is positioned atop the floor of a reservoir with the enclosure having inlets for sludge and liquid to flow into the cavity. The cavity includes a channel for the sludge and liquid to flow upward in the channel which increases in size. Gas emitters on the edge portions of the enclosure assist the flow of sludge and liquid into the cavity.

Apparatus for collecting solids settling at the bottom of a liquid reservoir, the apparatus including: a plurality of suction head assemblies, each suction head assembly including a hollow suction head configured to cause agitation of solids settling in or around the suction head and draw the solids entrained in a liquid flow into one or more outlets of the suction head; a manifold including a body having one or more inlets coupled to the one or more outlets of each suction head to permit the collected solids entrained in the liquid flow to pass into the manifold and one or more discharge ports configured to expel the collected solids entrained in the liquid flow from the manifold; and a pumping arrangement that draws in liquid and entrained solids from the suction head assemblies via the manifold and discharges the liquid and entrained solids via a discharge pipe.

Non-clogging airlift pumps and associated systems and methods employing said pumps. The airlift pumps generally include an enclosed air tank within which is located a hollow cylinder having an open top and a closed bottom wall. A gas (e.g., air) line passes into the air tank for supplying gas thereto. A suction port is located in the bottom wall of the cylinder, and a substantially vertically-oriented discharge pipe passes through a top wall of the air tank such that an intake end of the discharge pipe resides within the cylinder. Multiple airlift pumps may be used in conjunction in a given application.

A method for recovering fine tailings from a tailings pond includes selecting a desired density of fine tailings to be removed from the tailings pond. Positioning a hollow shell having a closed bottom and holes formed through a sidewall of the shell within the tailings pond such that the holes are located at a depth of a layer of the fine tailings of the desired density and such that a top of the shell is disposed above a free water surface of the pond. Causing a flow of the fine tailings of the desired density through the holes into into the shell and removing the fine tailings of the desired density from within the shell.

Apparatus for collecting solids settling at the bottom of a liquid reservoir, the apparatus including: a plurality of suction head assemblies, each suction head assembly including a hollow suction head configured to cause agitation of solids settling in or around the suction head and draw the solids entrained in a liquid flow into one or more outlets of the suction head; a manifold including a body having one or more inlets coupled to the one or more outlets of each suction head to permit the collected solids entrained in the liquid flow to pass into the manifold and one or more discharge ports configured to expel the collected solids entrained in the liquid flow from the manifold; and a pumping arrangement that draws in liquid and entrained solids from the suction head assemblies via the manifold and discharges the liquid and entrained solids via a discharge pipe.

A method for recovering fine tailings from a tailings pond includes selecting a desired density of fine tailings to be removed from the tailings pond. Positioning a hollow shell having a closed bottom and holes formed through a sidewall of the shell within the tailings pond such that the holes are located at a depth of a layer of the fine tailings of the desired density and such that a top of the shell is disposed above a free water surface of the pond. Causing a flow of the fine tailings of the desired density through the holes into into the shell and removing the fine tailings of the desired density from within the shell.

Waste water treatment systems and methods are described that remove screenings, objects, and grit from waste water. The system includes a tank for receiving unfiltered waste water from an inlet and a flow screen installed in the tank to capture screenings that are objects too large to pass through the flow screen. A washing compactor ejects the screenings out of the system. Filtered water containing grit passes through the flow screen and under a velocity-diffusing baffle surrounding the flow screen into the tank to produce a grit slurry. A pump removes the grit slurry from the tank through piping to a dewatering device, and the dewatering device removes water from the grit slurry to produce dewatered grit. Filtered waste water and objects are transmitted out of the tank via an outlet after it flows over an overflow weir installed around an interior surface of a wall of the tank.

An apparatus to lift liquid from a reservoir of liquid and aerate the liquid. A downwardly opening enclosure has an inlet for liquid to flow from a reservoir into the enclosure. The enclosure includes a channel for the liquid to flow upward. An inner cone within an outer cone forms a gas chamber connected to an external gas compressor. Holes in the gas chamber walls allow the gas to flow into the channel and aerate the liquid which is returned to the reservoir.