Abstract: The biological process is for treating wastewater in order to remove the phosphorus therefrom and thus obtain clarified water. The process is using two sequencing batch reactors (SBR) in series filled with a sludge-mixed liquor. The process consists of: continuously feeding wastewater into the first (SBR) operating under anaerobic conditions for equalization and anaerobic treatment by controlling in-time any fermentation reaction occurring therein in order to produce an acidogenesis fermenting phase of organic materials and prevent the methanogenesis phase. Then, the fermented wastewater from the first SBR is rapidly transferred by batch into the second SBR. In the second SBR, the wastewater is first anaerobically treated to store a maximum amount of volatile fatty acids (VFAs) in the phosphorus removal biomass.

Abstract: The process for treating waste water uses the combination of a septic tank operating in series with a biological reactor such as a sequencing batch reactor. In this process, waste water is supplied and accumulated in a septic tank. In the septic tank, the waste water and the settling sludge are biologically treated under anaerobic conditions. A given amount of treated waste water is then transferred from the septic tank into a biological reactor such as a sequencing batch reactor, where it is mixed and aerated. Such a mixing and aerating causes activation of the sludge and clarification of the waste water. The activated sludge in suspension in the liquor is then allowed to settle and an upper layer of clarified water formed above the mixed liquor after the settling period is decanted. The excess activated sludge in the biological reactor may then be removed therefrom and supplied into the septic tank so that the excess sludge be treated by digestion therein.

Abstract: A process for treating wastewater in a dynamic bio-sequenced manner in a single SBR reactor already filled with an activated sludge mixed liquor. In this process which is simple, fast and biologically and hydraulically "on going" and which allows one single SBR reactor to process typically twice as many batches of water per day as is presently processed within the existing SBR process, a given amount of wastewater rapidly introduced into the SBR reactor below the clear water level to cause the level of the wastewater within the tank to raise relatively uniformly and vertically and the supernatant clarified water to enter decantation pipes and be discharged out of the reactor. Then, the scum floating on top of the wastewater is collected and discharged and the mixed liquor is mixed and aerated as long as necessary to achieve the required treatment.

Abstract: A jet aeration header is disclosed, for use in water and wastewater process and treatment system. The header comprises a first pipe defining a cylindrical water passage, a second pipe extending parallel to the first pipe and defining a cylindrical air passage, at least one water outlet conduit connected to the first pipe to allow water to be expelled out of the water passage, an air-feed pipe connecting the second pipe to the outlet conduit to allow air to be delivered from the air passage to the water flowing through this conduit, and a venturi cone mounted in the outlet conduit to allow air to be FED from the air passage and be mixed with a water expelled through the outlet conduit.

Abstract: Disclosed is a decanter device for use to withdraw supernatant liquid from a reactor tank containing a mixture of liquids of different densities or a liquid mixed with solid particles to be separated. The device comprises a perforated pipe mounted inside the tank. The pipe has a plurality of inlets in the form of small orifices opening into the tank, and at least one outlet leading out of the tank. An inflatable membrane is mounted inside the pipe in such a manner as to extend over the small orifices and sealingly close the inlets of the pipe when it is inflated, and to extend away from the small orifices and away from the outlet to allow supernatant liquid to flow out of the tank through the pipe when the membrane is not inflated. A source of air or water under pressure is used for inflating the membrane whenever desired to sealingly close the inlets of the pipe and thus prevent liquid or solids to penetrate in the pipe during reaction within the reactor tank.

Abstract: A waste water and sewage treatment system for use in a facultative aeration-sedimentation basin or lagoon includes a submerged water pump mounted in a well in water communication with the basin. This pump supplies water under pressure to a water header on which a plurality of water jets are mounted in such a manner as to create the forced water circulation inside the basin. Each water jet incorporates an air-sucking venturi to oxygenate the waste water or sewage. Valves are provided in the well for disconnecting the water pump from the water header and then connecting it to a sludge collecting duct extending from the well over a given distance into the basin in such a manner as to drain off the accumulated sludge at the bottom of the basin through the sludge collecting duct and drain-out through a sludge disposal pipe. The system is particularly interesting in that it makes use of the same pump to aerate the waste water or sewage and drain-off the accumulated sludge.

Abstract: An aeration device is immersed in an aeration-sedimentation basin for oxygenating the water contained therein. The aeration device comprises a vertical, hollow aeration column with a lower inlet and an upper outlet. A pipe supplied with pressurized air has an orifice to produce in the column an upward jet of air. A skirt surrounds the lower portion of the column including the inlet, which skirt has a closed, lower end but an open, upper end above the level of the solid accumulations in the basin. Water substantially free from solid accumulations is therefore pumped by the air jet through the open, upper end of the skirt and the water inlet, the pumped water flowing through the column from the inlet to the outlet while being oxygenated by the air jet, and the so oxygenated water being returned in the basin through the outlet.