Abstract: Described herein is an anoxic submerged attached growth reactor which provides for removal of nitrate from wastewater as well as the process and/or method for using the reactor. Denitrifying bacterial grow on a support media within the reactor, and remove the nitrates from the wastewater. The reaction is carried out under anoxic conditions without agitation. Excess denitrifying bacterial release from the support media and collect at the bottom of the reactor.

Abstract: A diffuser for oxygenation of aqueous media comprises a manifold connectable to a source of pressurized oxygen-containing gas and having a plurality of outlet ports communicating a hollow interior of the manifold with an exterior thereof. A plurality of flexible microporous tubular membranes each have a coupled end secured to the manifold at a respective one of the outlet ports thereof to communicate an internal passage of the tubular membrane with the hollow interior of the manifold. An elongated rod extends along each tubular membrane within the internal passage thereof to maintain a length of the tubular membrane in an orientation projecting outward from the manifold with the free end of the tubular membrane further outward from the manifold than any other portion of the tubular membrane. The rods prevent curling of the tubular membranes over time when the diffuser is submerged in a liquid medium for use.

Abstract: Described herein is a Submerged Attached Growth Reactor (SAGR) which provides nitrification (ammonia removal) from wastewater in cold to moderate climates. The system described herein is novel in that the SAGR reactor includes more than one influent distribution point. Specifically, in addition to the first influent distribution point at the front end of the reactor, there is provided at least one additional distribution point(s) downstream of this first distribution point for introduction of influent into the reactor. As a result of this arrangement, when a second low carbonaceous biochemical oxygen demand (CBOD), high nitrogen influent is distributed into the reactor at a location downstream of the initial influent entry point, a second (or more) population of bacteria (mainly nitrifying bacteria) is established and/or maintained in a physically discrete part of the overall treatment reactor.

Abstract: A diffuser for oxygenation of aqueous media comprises a manifold connectable to a source of pressurized oxygen-containing gas and having a plurality of outlet ports communicating a hollow interior of the manifold with an exterior thereof. A plurality of flexible microporous tubular membranes each have a coupled end secured to the manifold at a respective one of the outlet ports thereof to communicate an internal passage of the tubular membrane with the hollow interior of the manifold. An elongated rod extends along each tubular membrane within the internal passage thereof to maintain a length of the tubular membrane in an orientation projecting outward from the manifold with the free end of the tubular membrane further outward from the manifold than any other portion of the tubular membrane.

Abstract: Described herein is a Submerged Attached Growth Reactor (SAGR) which provides nitrification (ammonia removal) from wastewater in cold to moderate climates. The system described herein is novel in that the SAGR reactor includes more than one influent distribution point. Specifically, in addition to the first influent distribution point at the front end of the reactor, there is provided at least one additional distribution point(s) downstream of this first distribution point for introduction of influent into the reactor. As a result of this arrangement, when a second low carbonaceous biochemical oxygen demand (CBOD), high nitrogen influent is distributed into the reactor at a location downstream of the initial influent entry point, a second (or more) population of bacteria (mainly nitrifying bacteria) is established and/or maintained in a physically discrete part of the overall treatment reactor.