Abstract:
A liquid/solids separation device is provided in which a tubular feed chamber (5) extends vertically downwards within a container. The feed chamber is open at its lower end (28) which is located well above a central outlet (4) in the bottom of the container to provide for a compacted zone of dewatered solids located below the lower end of the feed chamber. A usually semi-circular furcated mixing rake (26) is positioned within the feed chamber and a dewatering ring (24) is positioned around the lower end of the feed chamber. An inlet to the feed chamber in the upper region directs inlet slurry in a circumferential direction by conveniently making the inlet pipe (9) follow a tangential path or that of an involute, relative to the tubular feed chamber. Means (15) are also provided for introducing clarified liquid from the top region of the container into the inlet slurry. Thickened underflow material is withdrawn from the base of the container through a sleeve and clarified liquor exits from the top of the container.
Abstract:
A method of separating, recovering and reusing components of an exhausted slurry used in slicing silicon wafers from a silicon ingot. In the method, the viscosity of the exhausted slurry is reduced and the lubricating fluid component of the slurry is separated from solids and collected, the collected lubricating fluid component being suitable for reuse in the preparation of a fresh slurry without any additional separation steps being necessary. Additionally, the separated solids may be collected and further separated into an unspent abrasive grain component, which is suitable for reused in the preparation of a fresh slurry, and a waste product containing silicon particulate and spent abrasive grains.
Abstract:
Hydrogen sulfide is removed from water by methods and apparatus (1) that cause sufficient oxygen to be dissolved in the water for sufficient time at sufficient pressure to precipitate out solid elemental sulfur (30) and other solid sulfur particles.
Abstract:
A method for removing a sludge (62) from a crude oil tank (60) while recovering hydrocarbons from the sludge (62). The method is carried in the crude oil tank (60), is studied to determine a preferred treatment fluid. Once the treatment fluid is in place in the tank (60), the contents are vigorously mixed and agitated. Subsequently, the contents of the tank (60) are sampled and any recovered hydrocarbons are removed, followed by removal of the treatment fluid.
Abstract:
Disclosed is a clarifier for use in treating a liquid containing non-soluble particles in suspension in order to separate these particles from the liquid. It comprises a tank, a liquid supply duct opening into the bottom portion of the tank and an injector for injecting a gas under pressure into at least part of liquid supplied to the supply duct in order to saturate this liquid with said gas and thus to generate gas bubbles as the saturated liquid is subject to depressurization within the tank. The gas bubbles that are so-generated adhere to the particles in suspension in the liquid and lift them up to form a floating layer of sludge in the top portion of the tank. A scraper is provided in the top portion of the tank for skimming off the layer of sludge while it is formed. A plurality of plates extend at an angle within the tank above the supply duct. These plates define a set of upwardly inclined channels each having an upper end that is opened and through which the liquid fed into the tank may enter the channel. A liquid outlet mounted within the lower end of each channel to collect and remove from the tank the liquid that has been treated within the same. Thanks to its shape and structure, this clarifier occupies a surface area on the ground that 50 % or less smaller than any known clarifier of the same capacity. Its structure also permits to maintain much more microbubbles of requested size for a same amount of injected air in order to increase the probability of contact between the particles and the air bubbles.
Abstract:
In an extended aeration wastewater treatment system having wastewater flowing into a retention basin (2) so as to form mixed liquor within the retention basin, a mixed liquor wasting system (1) including: a thickener tank (13) having a sidewall and a bottom; a waste line (10) having a first end fluidly connected to the retention basin and a second end fluidly connected to the thickener tank; a first flow control device, such as a pump (18), for continuously removing a portion of the mixed liquor from the basin at a desired constant flow rate through the waste line, positioned in the waste line; a sludge removal line (20) having a first end fluidly connected to the bottom of the thickener tank and a second end fluidly connected to a sludge disposal system (23); a second flow control device, such as a pump (27), for removing a concentrated portion of the mixed liquor from the thickener tank, positioned in the sludge removal line; and a return line (28) having a first end fluidly connected to the thickener tank above the bottom and a second end fluidly connected to the retention basin.
Abstract:
A process and device are disclosed for removing sand from water loaded with sand and organic substances. The water is made to swirl in a standing container, so that the organic substances are moved upwards to an overflow (13) whereas the sand sinks downwards to a discharging conveyor (3) connected to the bottom of the container and is only discharged after a settling time. In order to achieve a substantial separation of sand and organic substances, the settled sand is agitated by an agitator mechanism (4) at the same time as it is rinsed with fresh water supplied to the bottom area of the container (1) and is only discharged in an amount such that a predetermined minimum height of the settled sand (18) is ensured.