Achieving　economic　and　efficient　removal　of　nutrients　in　mainstream　wastewater　treatment　plants　(WWTPs)　continues　to　be　a　challenging　research　topic.　In　this　study,　a　continuous-flow　anaerobic/aerobic/anoxic　system　with　sludge　double　recirculation　(AOA-SDR),　which　integrated　partial　nitrification　(PN),　endogenous　denitrification　(ED)　and　nitrite-type　denitrifying　phosphorus　removal　(nDNPR),　was　constructed　to　treat　real　carbon-limited　municipal　wastewater.　The　average　effluent　concentrations　of　total　inorganic　nitrogen　(TIN)　and　PO43--P　during　the　stable　operation　period　were　1.8　and　0.3　mg/L,　respectively.　PN　was　achieved　with　an　average　nitrite　accumulation　ratio　of　90.4　%　by　combined　strategies.　Adequate　storage　of　polyhydroxyalkanoates　and　glycogen　in　the　anaerobic　zone　promoted　the　subsequent　nitrogen　removal　capacity.　In　the　anoxic　zone,　nitrite　served　as　the　main　electron　acceptor　for　the　denitrifying　phosphorus　removal　process.　Mass　balance　analysis　revealed　that　nDNPR　contributed　to　23.6　%　of　TIN　removal　and　44.7　%　of　PO43--P　removal.　The　enrichment　of　Nitrosomonas　(0.45　%)　and　Ellin　6067　(1.31　%),　along　with　the　washout　of　Nitrospira　(0.15　%)　provided　the　bacterial　basis　for　the　successful　implementation　of　PN.　Other　dominant　endogenous　heterotrophic　bacteria,　such　as　Dechlormonas　(10.81　%)　and　Candidatus　Accumulibacter　(2.96　%),　ensured　simultaneous　nitrogen　and　phosphorus　removal　performance.　The　successful　validation　of　integrating　PN,　ED　and　nDNPR　for　advanced　nutrient　removal　in　the　AOA-SDR　process　provides　a　transformative　technology　for　WWTPs.