Abstract: A method is provided herein for the treatment of sewage or other impure water. The method includes adding, to the sewage or other impure water in a mixing zone, all three individually but no more than two premixed together of the following: (a) an inorganic coagulant, (b) an anionic polymer, and (c) a cationic polymer, with intimate mixing of the added chemicals with the sewage or other impure water, with the proviso that (d) the inorganic coagulant, either alone or with the anionic polymer or the cationic polymer, cannot be added last; and (e) the anionic polymer and the cationic polymer cannot be intimately mixed and added together. This provides chemically-treated effluent having large, compact, firmly bonded, substantially-shear resistant and rapidly-separatable flocs therein. The flocs are separated from the liquid in a separating zone. Finally treated effluent effluent is removed from the separating zone.

Abstract: A novel sewage purification method is provided herein. The method includes adding particular amounts of at least alum, a cationic polyelectrolyte and an anionic surface active compound to the sewage or other impure water in any order, then turbulently mixing the added chemicals within the sewage or other impure water, then allowing particulate matter to settle as sludge, and finally drawing off pure water. Preferably, part of the sludge is recycled to the sewage or other impure water to be treated.

Abstract: A novel sewage purification system is provided herein. The system includes a pump for drawing sewage into the system and an injection inlet for injecting chemical into the effluent line from the pump. The pump leads to a pair of interconnected U-shaped mixing chambers connected to the effluent line from the pump, the U-shaped mixing chambers being baffled and being of a particular construction. There is also a recycle line from the inlet line to the mixing chambers back to the pump for recycling about 1-20% of the total flow rate, which is generally about 5-40 gallons/minute through the system. The U-shaped mixing chambers are also provided with at least two injection inlets for injecting chemicals thereinto. A splitter chamber is connected to the outlet from the mixing chambers to provide a pair of parallel flow outlets therefrom.

Abstract: A stem securing assembly for conduits and a method for its use is provided herein. The conduit, e.g., of polyethylene tubing, is apertured through the wall thereof and a hollow stem to be secured thereto, e.g., for sprinkler heads and the like, is provided with a frusto-conical bulbous base. Preferably, it is provided with a double sloping shouldered base with the diameter of the frusto-conical bulbous base being slightly less than the diameter of the conduit aperture so that the lower end of the hollow stem is insertable through the aperture. A malleably deformable, e.g., resilient, sleeve is positioned to surround the stem and to rest on the frusto-conical bulbous base, or on the second shoulder if both are provided. The assembly so provided is inserted into the aperture. The sleeve has an outside diameter enabling snug insertion of the sleeve into the aperture. A clamping member, e.g., a screw-threaded nut or the like, engages the stem and is urged, e.g.

Abstract: Improvements are provided in a sprinkler head assembly including a hollow sprinkler head assembly tube, a sprinkler tip secured in the upper portion of that tube and a valve secured in the lower portion thereof. The sprinkler tip body is secured in the upper portion by cooperation between a securing structure which depends from the sprinkler tip, (e.g., a central tube having an internally threaded bore, the tube having a slit through the walls at its lower end forming bifurcated portions provided with a pair of wings, each having an upwardly facing abutting shoulder thereon), and retainers on the inner wall of the hollow sprinkler head assembly within the upper portion thereof, (e.g., a downwardly facing abutting shoulder spaced downwardly from the upper end of the tube) with an actuator for urging the securing structure into engagement with the retainers (e.g.