Abstract: A method of minimizing head loss in a filter system including a plurality of drop pipes, a plurality of filter cells having a maximum influent level, and a distribution box having a maximum influent level, a base, and a plurality of distribution cells. The method includes positioning a first end of each of the plurality of drop pipes within one of the distribution cells such that the first end of the pipe is disposed within the distribution cell and defines a weir having a weir height. The method further includes positioning a second end of each of the pipes in fluid communication with one of the plurality of filter cells. The method also includes supporting the distribution box such that the maximum influent level of the filter cells is above the base of the distribution box and below the maximum influent level of the distribution box.

Abstract: The invention recites a filter comprising a block including an outer wall defining an inner chamber and a block exterior, and a conduit having a conduit wall, a first conduit end, a second conduit end, and an inner flow path providing fluid communication between the first and second conduit ends. The conduit wall includes an orifice therethrough. The conduit is coupled to the block such that the first conduit end is in fluid communication with the inner chamber of the block and the second conduit end and the orifice are in fluid communication with the block exterior.

Abstract: An electrodeionization apparatus comprising an endblock formed from a resilient material, and method for making the same. The resilient material may include various types of thermoplastic elastomers, such as, styrene block copolymers, copolyesters, plolyurethanes, polyamides, thermoplastic elastomeric olefins, and thermoplastic vulcanizates. The resilient material may have a Shore A hardness of between about 40 and about 90.

Abstract: A novel process and apparatus are disclosed for cleaning wastewater containing metal ions in solution, hydrogen peroxide, and high solids, e.g., greater than about 50 mg/l particulate solids. A carbon adsorption column removes hydrogen peroxide in the wastewater feed containing high solids. A ion exchange unit removes the metal ions from solution. The process and apparatus remove metal ions such as copper from a high solids byproduct polishing slurry from the chemical mechanical polishing (CMP) of integrated circuit microchips to form an environmentally clean wastewater discharge.

Abstract: A reciprocating scotch yoke drive mechanism connectable to a motor drive shaft, includes a yoke member connectable to the shaft which moves the yoke member in a linear reciprocating motion and a guide having one or more slide tracks configured to define a reciprocal sliding path for the yoke member. The yoke member also has a sliding formation configured for slidingly engaging the slide track. And the sliding formation and the slide track have complementary configurations for maintaining alignment of the yoke member during reciprocal sliding motion and engagement of the yoke member in the slide track under a variety of angular stresses.

Abstract: Water purity indicating apparatus is adapted to operate on AC input power and includes a housing and a pair of test probes extending from the housing for measuring a resistance of water. Also included is a circuit connected to the test probes and provided within the housing for outputting a signal indicating a purity level of the water based on a first AC voltage generated as a result of the measured resistance of the water.

Abstract: A backwash sealing shoe is provided for a filtration system including a tank having an undivided filtration bed and a plurality of side-by-side headers within the bed, each header in communication with a respective port in a wall of the tank. The sealing shoe includes a hydraulic section including an opening surrounded by a seal and adapted to sealingly engage the wall in surrounding relationship to at least one of the ports; and at least one blocking section adjacent the hydraulic section on one side thereof and including a plate surrounded by a seal and adapted to sealingly engage the wall in surrounding relationship to at least one adjacent port to thereby block flow from the tank through at least one adjacent port during a backwash operation.

Abstract: Mixing apparatus includes a tank having an upright draft tube extending from above an operating level of liquid contained in the tank to a level near the bottom of the tank, the draft tube being in fluid communication with the tank at a level near the bottom of the tank below the operating level of the liquid. A nozzle is disposed within the draft tube for directing a stream of liquid downwardly against an impingement surface transverse to the draft tube at the level of fluid communication to entrain gas drawn down the draft tube and create a pattern of bubbles flowing radially outwardly from the draft tube. The impingement surface is close to, or is a portion of, the tank bottom so that the radially flowing bubbles sweep across at least a portion of the bottom of the tank.

Abstract: An upflow liquid treatment method is provided with a vibrator which is used to facilitate the settling of granular solids down through a grate used to hold the solids in a static condition during the treatment cycle when liquid to be treated is passed upwardly through the bed.

Abstract: Process for effecting the selective removal of sulfur dioxide values from industrial waste gases or the like and conversion thereof to elemental sulfur wherein a particularly constituted solution of mixed ammonium phosphates is exposed to absorbent contact with the sulfur dioxide bearing gas stream followed by recovery of the sulfur values therefrom and regeneration of the absorbent solution preparatory to reexposure thereof to the sulfur dioxide bearing gas stream.

Abstract: Closed circuit process for effecting the selective removal of sulfur dioxide values from industrial waste gases or the like wherein a particularly constituted confined solution of mixed ammonium phosphates is exposed to absorbent contact with a sulfur dioxide bearing gas stream in an electrostatic force field followed by a thermally induced desorption of recoverable sulfur dioxide values therefrom and regeneration of the solution preparatory to reexposure thereof to the suflur dioxide bearing gas stream.

Abstract: An improved multi-jet nozzle construction for pulse-jet dust collectors including a multi-stage blow-pipe assembly incorporating at least one selectively located internal restriction disposed in facing relation to the direction of flow of compressed cleaning gas therethrough.

Abstract: Removal of dissolved hydrogen sulfide and a reduction in BOD is achieved by the addition of nitrate ions to waste systems in an amount sufficient to stimulate growth of bacteria which utilize dissolved hydrogen sulfide in their metabolism. Specifically, about 2.4 lbs. nitrate oxygen per lb. of sulfide is required.