Patent ID: 11919790
Assignee: SHANDONG JIANZHU UNIVERSITY
Field: Environmental technology (Chemistry)
Classification: CPC C | IPC C

Claim 4:
5. An anaerobic-AO-SACR combined advanced nitrogen removal method for high ammonia-nitrogen wastewater by the system according to claim 2 comprising the following steps:
(1) high ammonia-nitrogen wastewater enters the anaerobic reactor from the adjusting pool, macromolecular and refractory organic matters in the high ammonia-nitrogen wastewater are decomposed into small molecules, and most of organic matters in the high ammonia-nitrogen wastewater are removed;
(2) an effluent water of the anaerobic reactor enters the AO reactor for pre-denitrification in the anoxic zone and aerobic nitrification in the aerobic zone; thereafter the effluent water looks like a sludge water mixture, which undergoes sludge water separation in the sedimentation pool, one part of effluent water enters the intermediate pool, and the other part returns to the front end of the anoxic zone through the nitrification liquid reflux pump of the AO reactor for pre-denitrification; and one part of sludge returns to the front end of the anoxic zone through the sludge reflux pump of the AO reactor, and the other part is drained as the remaining sludge;
(3) the one part of effluent water of the AO reactor enters the intermediate pool, under the adjustment and control by the water quality testing device and the PLC controller, a part of high ammonia-nitrogen wastewater of the adjusting pool is introduced by the water pump into the intermediate pool to adjust the carbon nitrogen ratio:
after wastewater entering the SACR from the intermediate pool, the wastewater first undergoes anoxic agitation, when a pH value of the wastewater changes from increasing to decreasing, a pre-denitrification of the wastewater in the SACR is over; after T hours, agitation is stopped, and aerated nitrification is started; when a pH value of the pre-denitrificated wastewater in the SACR changes from decreasing to increasing, and DO increasing, the nitrification of the pre-denitrificated wastewater in the SACR is over; at this time, aeration is closed, agitation is continued, endogenous denitrification is started, and a change of ORP in the SACR is observed; when the ORP in the SACR decreasing, the denitrification of the nitrificated wastewater in the SACR is over; and at this time, agitation is closed, and sedimentation and drainage are carried out.