Exemplary embodiments are directed to pool cleaners that remove debris from water using a plurality of cyclonic flows, or that include a removable impeller subassembly, a check valve for a debris canister, a particle separator assembly having a handle that locks to the pool cleaner, a modular roller drive gear box, or a roller latch that secures a roller to the pool cleaner. Exemplary embodiments are also directed to the check valve and the roller latch themselves. Exemplary embodiments are directed to a filter medium for pool cleaners that includes embossments providing flow channels for water, and to roller assemblies for pool cleaners. Exemplary embodiments are directed to pool cleaners including alternative pump motor engagements. Exemplary embodiments are directed to pool cleaners power supplies that include a potted and contoured power board assembly, and to kickstands therefor. Exemplary embodiments are directed to a pool cleaner caddy, and removable wheels therefor.

In alternative aspects, the invention provides process for the use of ionic liquids in the remediation and amelioration of oilsand materials, including treatment of tailings products including but not limited to mature fine tailings (MFT), separation of bitumen from oilsand, bitumen transportation, remediation of spilled bitumen and dilbit, treatment (breakage) of steam assisted gravity drainage (SAGD) and heavy oil emulsions, solids removal from oil processing streams, in-situ bitumen recovery, in-situ extraction from mineral reservoirs, production well chemicals, CO2 sequestration and fracking fluids.

In alternative aspects, the invention provides process for the use of ionic liquids in the remediation and amelioration of oilsand materials, including treatment of tailings products including but not limited to mature fine tailings (MFT), separation of bitumen from oilsand, bitumen transportation, remediation of spilled bitumen and dilbit, treatment (breakage) of steam assisted gravity drainage (SAGD) and heavy oil emulsions, solids removal from oil processing streams, in-situ bitumen recovery, in-situ extraction from mineral reservoirs, production well chemicals, CO2 sequestration and fracking fluids.

A centrifugal, liquid-liquid separator relies on a sweep flow in excess of the flow rate naturally occurring in the heavy constituent or species being separated out from a lighter species, in order to prevent access by the long-chain polymers of the lighter species to solids that may separate out and make a durable composition of polymers and particles that adheres and compacts against the shell wall of the centrifuge.

A method and system treat contaminated water. In one embodiment, the method comprises treating contaminated water by introducing a methylmorpholine-N-oxide solution to a vessel. The vessel contains the contaminated water and iron oxide. The contaminated water comprises contaminants. In addition, the methylmorpholine-N-oxide solution comprises methylmorpholine-N-oxide and water. The method further comprises contacting the methylmorpholine-N-oxide solution with the contaminated water. In addition, the method comprises treating the contaminated water by allowing the methylmorpholine-N-oxide to react with the contaminants in the presence of the iron oxide.

A method and system treat contaminated water. In one embodiment, the method comprises treating contaminated water by introducing a methylmorpholine-N-oxide solution to a vessel. The vessel contains the contaminated water and iron oxide. The contaminated water comprises contaminants. In addition, the methylmorpholine-N-oxide solution comprises methylmorpholine-N-oxide and water. The method further comprises contacting the methylmorpholine-N-oxide solution with the contaminated water. In addition, the method comprises treating the contaminated water by allowing the methylmorpholine-N-oxide to react with the contaminants in the presence of the iron oxide.

A method and installation for treating wastewater containing ammonia includes feeding activated sludge from an aeration tank into a hydrocyclone. The sludge is separated into a specifically heavy fraction containing mostly anaerobic ammonia-oxidizing bacteria (anammox) and a specifically light fraction containing mostly aerobic oxidizing bacteria (AOB), which are returned to the aeration tank. The hydrocyclone includes a roughened inner wall surface for at least partially removing an organic or inorganic cover layer disposed on the anaerobic ammonium-oxidizing bacteria (anammox).

An inlet arrangement for a tray-based grit removal system utilizes a set of separate inlet hoses to connect the vertical stack of trays to a horizontally-disposed inlet chute, thus eliminating the inlet duct utilized in prior art configurations. Each hose is configured to have about the same length and diameter, providing an essentially uniform influent pressure at the input to each tray. The hoses are directly connected between the trays and the inlet chute, where each tray may be formed to include a hose coupler of the same diameter as the hose. The inlet chute may take the form of a trough or tube (or other suitable geometry), with the plurality of hoses all terminating along a common, horizontal output face of the chute.

A method to remove oil from an oily water stream includes the step of pressure controlling a release of dissolved gases from the stream as the stream passes through two or more stages of gas flotation treatment. The operating pressure of the first stage of flotation treatment is purposefully reduced relative to that of an upstream unit so that a certain controlled percent volume of dissolved gases is released. The operating pressure of the second stage of flotation treatment is then purposefully reduced relative to that of the first stage so that another controlled percent volume of dissolved gases is released. Any subsequent flotation treatment stage is at a lower operating pressure than that of the previous stage so that the subsequent treatment stage releases a controlled percent volume of dissolved gases. By controlling the operating pressure in this way, overall separation performance is improved.

A method to remove oil from an oily water stream includes the step of pressure controlling a release of dissolved gases from the stream as the stream passes through two or more stages of gas flotation treatment. The operating pressure of the first stage of flotation treatment is purposefully reduced relative to that of an upstream unit so that a certain controlled percent volume of dissolved gases is released. The operating pressure of the second stage of flotation treatment is then purposefully reduced relative to that of the first stage so that another controlled percent volume of dissolved gases is released. Any subsequent flotation treatment stage is at a lower operating pressure than that of the previous stage so that the subsequent treatment stage releases a controlled percent volume of dissolved gases. By controlling the operating pressure in this way, overall separation performance is improved.