Anaerobic/aerobic/anoxic　(AOA)　is　suitable　for　advanced　nitrogen　removal　of　low　C/N　wastewater　as　an　energy-saving　process.　Investigations　of　the　temperature　impact　on　the　AOA　process　are　critical　to　its　application　in　cold　regions　or　seasons.　In　this　study,　the　nitrogen　removal　performance　in　AOA　at　low　and　room　temperatures　was　investigated.　The　nitrification　capacity　of　the　AOA　process　was　recovered　at　low　temperature　and　the　endogenous　denitrification　performance　was　enhanced　by　converting　the　partial　aerobic　zone　into　anoxic.　At　15　degrees　C,　treating　real　municipal　sewage　with　a　low　C/N　ratio　(3.36),　TIN　and　NH4+-N　removal　efficiencies　of　84.3　+/-　6.6%　and　97.4　+/-　3.3%　respectively,　were　achieved.　The　oxygen　uptake　rate　test,　quantitative　PCR,　and　high-throughput　sequencing　results　indicated　that　the　activity　and　abundance　of　ammonia-oxidizing　bacteria　(AOB)　increased　at　low　temperature,　which　was　the　key　for　nitrification　capacity　recovery.　Overall,　the　recoverability　of　nitrification　capacity　in　the　AOA　system　made　advanced　nitrogen　removal　possible　at　low　temperatures.　(c)　2021　Elsevier　B.V.　All　rights　reserved.