A waste water treatment includes a biological filtration tank, a nitritation tank, and an anammox tank. The biological filtration tank performs biological filtration as a pretreatment process with regard to influent waste water and removes solids and organic matters. The nitritation tank performs a nitritation process with regard to waste water flowing from the biological filtration tank and supplies an electron acceptor needed for removing the organic matter in the biological filtration tank by returning some of the waste water back to the biological filtration tank. The anammox tank performs an anaerobic ammonium oxidizing process with regard to the waste water received from the biological filtration tank and the nitritation tank.

This invention is to the removal of organics and nutrients from wastewater. More specifically, the invention addresses the removal of nutrients such as nitrogen and/or phosphorus from wastewater and has specific adaptations that can be of added benefit in small systems including septic tanks, cluster wastewater systems, and other small treatment plants. The invention can also be used for larger treatment works and for sidestream treatment systems. The invention also has adaptations that can be used to treat wastewater in low gravity and other difficult environments. The invention also has adaptations to permit rapid startup, to induce dormancy, and to preserve organisms for extended periods of time.

Disclosed is a method for removing nitrogen and phosphorus from sewage and wastewater through a combination of a biological nitrogen and phosphorus removal process using nitrite nitrogen and an anaerobic ammonium oxidation process. An objective of an embodiment of the present invention is to provide an apparatus for removing nitrogen and phosphorus in which, by inducing a denitritation- and nitritation-based biological nitrogen and phosphorus removal process in a bioreactor and applying an anaerobic ammonium oxidation process, nitrogen and phosphorus can be economically and effectively removed without separately injecting organic materials.

Disclosed is a method for removing nitrogen and phosphorus from sewage and wastewater through the improvement of a process configuration and a method for determining internal flows in an existing biological nitrogen and phosphorus removal process in combination with a deammonification process. According to an embodiment of the present invention, provided is a nitrogen and phosphorus removal apparatus in which, to form conditions in an anaerobic ammonium oxidation tank to perform a deammonification reaction, the influent flow rate into the nitrogen and phosphorus removal apparatus, the flow rate of water returned between reaction tanks, and the amount of returned sludge are controlled.

Provided is a method for treating ammoniacal nitrogen in wastewater performed via biologically oxidizing ammoniacal nitrogen, and producing nitrite nitrogen and nitrate nitrogen at a desired rate. In the method, ammoniacal nitrogen is oxidized by bacterial sludges to produce at least either of nitrite nitrogen and nitrate nitrogen. Specifically, the method includes an inactivating treatment step of treating the bacterial sludges with an inactivating operation via sterilizing bacteria or causing bacteriostasis, and a nitrifying treatment step of oxidizing the ammoniacal nitrogen by the bacterial sludges thus treated in the inactivating operation. Production amounts of the nitrite nitrogen and the nitrate nitrogen are controlled by adjusting biomass of the bacterial sludges to be treated in the inactivating operation, and/or a time interval between the inactivating operations each repeatedly performed in combination with the nitrifying treatment step.

This specification describes a membrane aerated biofilm media and reactor (MABR) having a discontinuous layer of a porous material applied to the outer surface of a gas-transfer membrane. The porous material may have a void fraction of 50% or more. The porous material may have a thickness of up to about 500 microns and a pattern on the same order of magnitude as its thickness. The media may be used to carry on a deammonification reaction. In use, ammonia oxidizing bacteria (AOB) and annamox bacteria grown in or on the media, with the annamox bacteria located primarily in the porous material. The supply of oxygen through the gas-transfer membrane is limited to suppress the growth of nitrite oxidizing bacteria (NOB). Excess biofilm is removed, for example by coarse bubble scouring. The media may be placed in an anoxic zone of an activated sludge plant, which may be upstream of an aerobic zone.

A temperature controlled biological growth surface, including a biomass growth surface configured to support a biomass, and a temperature source in thermal communication with the biomass growth surface. Further, a method for removing one or more of nitrogen, carbon, or phosphate from a medium, including contacting a temperature controlled biological growth surface with the medium, where the biological growth surface comprises an organism configured to remove the one or more of nitrogen, carbon, or phosphate from the medium when within a temperature range, and heating the temperature controlled biological growth surface to within the temperature range in order to allow the organism to remove the one or more of nitrogen, carbon, or phosphate from the medium, or cooling the temperature controlled biological growth surface to within the temperature range in order to allow the organism to remove the one or more of nitrogen, carbon, or phosphate from the medium.

Provided is a wastewater treatment apparatus and a wastewater treatment method, in which denitrification process by anaerobic ammonium oxidation method can be stably performed at low cost. The wastewater treatment apparatus includes an ammonium oxidation tank and a heating tank in which the microbial sludge withdrawn from the ammonium oxidation tank is subjected to heat treatment. A wastewater treatment method is to heat the microbial sludge withdrawn from the ammonium oxidation tank by using heat supplied from a digestion tank in which waste sludge is digested by anaerobic microorganisms or from a heat source for heating the waste sludge to be digested in the digestion tank, and to return the microbial sludge, in which activity of nitrite oxidizing bacteria is reduced by the heat treatment, to the ammonium oxidation tank, so that the ammonium nitrogen contained in the wastewater is oxidized to nitrite nitrogen.

One or more reactor and one or more control methods are used for nitrogen removal in wastewater treatment to achieve measured control of maintaining high ammonia oxidizing bacteria (AOB) oxidation rates while achieving nitrite oxidizing bacteria (NOB) out-selection, using various control strategies, including: 1) ammonia and the use of ammonia setpoints; 2) operational DO and the use of DO setpoints; 3) bioaugmentation of anammox and lighter flocculant AOB fraction; and 4) implementation of transient anoxia in several reactor configurations and conditions for removal of oxidized nitrogen using anammox or heterotrophic organisms. Controls described maximize nitrogen removal with minimal aeration, through control of transient anoxia and aerobic SRT, out-selection of NOB, and control of DO concentrations or aeration interval by keeping the reactor ammonia (NH.sub.4) and oxidized nitrogen (NOx) concentrations approximately equal, and maximize total inorganic nitrogen (TIN) removal through nitrification, limited nitritation, nitritation, denitrification, denitritation or deammonification making use of the aforementioned strategies.

The present invention provides an aeration lateral system designated to be site specific for new septic disposal areas or retro fitting to existing septic disposal areas to break up the biological clogging slug mat at the interface of the wastewater and imported sand or native soil fill under or adjacent to disposal areas of a typical septic system. The lateral system provides uniform or other site specific distribution of fluids about the bio-mat of a wastewater disposal area, with lateral spacing and hole spacing varying based on the type of disposal area being utilized. The lateral system can also be utilized to provide continuous low volume air supply system to a wastewater disposal area or peat filter module. The air lateral installation includes methods to minimize airflow disturbance of the soil and methods to prevent air leakage.