Integrating　endogenous　denitrification　(ED)　into　partial　nitrification-anammox　(PNA)　systems　by　adequately　utilizing　organics　in　municipal　wastewater　is　a　promising　approach　to　improve　nitrogen　removal　efficiency　(NRE).　In　this　study,　a　novel　strategy　to　inhibit　phosphorus-accumulating　organisms　(PAOs)　by　inducing　phosphorus　release　and　exclusion　was　adopted　intermittently,　optimizing　organics　allocation　between　PAOs　and　glycogen-accumulating　organisms　(GAOs).　Enhanced　ED-synergized　anammox　was　established　to　treat　real　municipal　wastewater,　achieving　an　NRE　of　97.5±2.2%　and　effluent　total　inorganic　nitrogen　(TIN)　of　less　than　2.0　mg/L.　With　low　poly-phosphorus　(poly-P)　levels　(poly-P/VSS　below　0.01　(w/w)),　glycogen　accumulating　metabolism　(GAM)　acquired　organics　exceeded　that　of　phosphorus　accumulating　metabolism　(PAM)　and　dominated　endogenous　metabolism.　Ca.　Competibacter　(GAO)　dominated　the　community　following　phosphorus-rich　supernatant　exclusion,　with　abundance　increasing　from　3.4%　to　5.7%,　accompanied　by　enhanced　ED　capacity　(0.2　to　1.4　mg　N/g　VSS　/h).　The　enriched　subgroups　(GB4,　GB5)　of　Ca.　Competibcater　established　a　consistent　nitrate　cycle　with　anammox　bacteria　(AnAOB)　through　endogenous　partial　denitrification　(EPD)　at　a　∆NO2−-N/∆NH4+-N　of　0.91±0.11,　guaranteeing　the　maintenance　of　AnAOB　abundance　and　performance.　These　results　provide　new　insights　into　the　flexibility　of　PNA　for　the　energy-efficient　treatment　of　low-strength　ammonium　wastewater.　©　2023