Patent ID: 11878926
Assignee: VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A mainstream deammonification process for removing ammonium from a wastewater stream, comprising:
clarifying the wastewater stream in a primary clarifier and producing a primary effluent;
directing a first portion of the primary effluent to a biological treatment reactor and removing carbon from the primary effluent to produce treated wastewater;
after treating the first portion of the primary effluent in the biological treatment reactor, directing the treated wastewater into an integrated fixed film activated sludge (IFAS) deammonification reactor that is provided with intermittent aeration including periods of air on and periods of air off;
directing a second portion of the primary effluent to the IFAS deammonification reactor and in the process bypassing the biological treatment reactor;
injecting the second portion of the primary effluent into the IFAS deammonification reactor during periods of air off and refraining from injecting the second portion of the primary effluent into the IFAS deammonification reactor during periods of air on, wherein the second portion of the primary effluent is mixed with the treated wastewater in the IFAS deammonification reactor to form a wastewater mixture;
in the IFAS deammonification reactor, removing ammonium from the wastewater mixture by a nitritation and anammox process; and
after removing ammonium from the wastewater mixture, directing the wastewater mixture to a secondary clarifier and producing a secondary effluent and a clarifier underflow, and recycling at least a portion of the underflow to the IFAS deammonification reactor.