METHOD FOR ENHANCING NITROGEN AND PHOSPHORUS REMOVAL BY COMBINING MULTI-STAGE AO SHORT-RANGE DENITRIFICATION COUPLING ANAMMOX PROCESS WITH SLUDGE HYDROLYTIC ACIDIFICATION

摘要

A device and method for enhancing nitrogen and phosphorus removal by combining a multi-stage AO short-range denitrification coupling ANAMMOX process with a sludge hydrolytic acidification mixture belong to the technical field of activated sludge method sewage treatments. A system comprises a water tank, a water pump, a biochemical reaction zone, a hydrolytic acidification tank and other devices; a multi-stage AO segmented water inlet pipeline injects raw water into the reaction zone in segments to ensure the efficient utilization of organic matter in the raw water; a biofilm carrier is added into anaerobic and anoxic zones to enrich anaerobic ammonia oxidizing bacteria, and short-range denitrification produces nitrite nitrogen to provide a substrate for the anaerobic ammonia oxidizing bacteria to facilitate the autotrophic removal of nitrogen; nitration and aerobic phosphorus absorption by phosphorus accumulating bacteria take place in an aerobic zone; part of residual sludge in a secondary sedimentation tank enters the hydrolytic acidification tank to convert macromolecular organic matter into micromolecular organic matter, the hydrolytic acidification mixture and residual sludge in the secondary sedimentation tank are synchronously returned to the anaerobic zone, and the micromolecular organic matter is used as a high-quality carbon source to promote short-range denitrification. The system provides a new method for the efficient and energy-saving treatment of urban sewage.