Patent ID: 11919791
Assignee: BKT CO., LTD.
Field: Environmental technology (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. An apparatus for removing nitrogen in sewage and/or wastewater, the apparatus comprising:
a pretreatment unit for removing solids or organic matters in influent sewage and/or wastewater;
a sludge treatment unit for receiving, thickening, and digesting the solids removed in the pretreatment unit to separate them into a dewatered cake and a supernatant liquid;
a sequencing batch biofilm reactor which receives sewage and/or wastewater that has passed through the pretreatment unit and adjusts a ratio of ammonia nitrogen and nitrite nitrogen in sewage and/or wastewater to a preset ratio;
an anammox reaction tank which receives sewage and/or wastewater that has passed through the sequencing batch biofilm reactor and removes ammonia nitrogen and nitrite nitrogen in sewage and/or wastewater with nitrogen gas; and
a control unit for controlling the sequencing batch biofilm reactor and performing controlling so that a supernatant liquid separated from the sludge treatment unit, not sewage and/or wastewater that has passed through the pretreatment unit, is flowed into the sequencing batch biofilm reactor when a concentration of nitrate nitrogen in the sequencing batch biofilm reactor is a preset concentration or more,
wherein the pretreatment unit removes solids or organic matters that are not required for nitrogen removal in the sequencing batch biofilm reactor and the anammox reaction tank,
the sequencing batch biofilm reactor discharges the entire amount of sewage and/or wastewater in the sequencing batch biofilm reactor to the anammox reaction tank when the concentrations of ammonia nitrogen and nitrite nitrogen in the flowed-in sewage and/or wastewater have a preset ratio, and
the sequencing batch biofilm reactor includes a carrier that allows ammonia-oxidizing bacteria to be selectively immobilized or attached to grow, and prevents the carrier from being discharged when the sewage and/or wastewater or supernatant liquid flowing into the inside of the sequencing batch biofilm reactor is discharged to the outside of the sequencing batch biofilm reactor.