The　nitrogen　removal　performance　of　granules　R1　(1~2.5mm)　and　flocs　R2　(0~0.25mm)　retrieved　from　SNAD　(simultaneous　partial　nitrification,　anaerobic　ammonium　oxidization　and　denitrification)reactor　was　investigated　by　serum　bottle　batch　tests　under　30.　To　the　granules,　the　aerobic　ammonium　and　aerobic　nitrite　oxidation　activity　were　0.166　and　0　kgN/(kg　VSS·d),　respectively.　The　specific　anammox　activity,　denitrification　activity　over　nitrite,　denitrification　activity　over　nitrate　were　0.158,　0.105,　0.094kgN/(kg　VSS·d),　respectively.　To　the　flocs,　the　aerobic　ammonium　and　aerobic　nitrite　oxidation　activity　were　0.180　and　0kgN/(kg　VSS·d),　respectively.　The　specific　anammox　activity,　denitrification　activity　over　nitrite,　denitrification　activity　over　nitrate　were　0.026,　0.096,　0.108　kgN/(kg　VSS·d),　respectively.　Both　granules　and　flocs　exhibited　good　partial　nitrification　activity　and　denitrification　activity.　The　specific　anammox　activity　of　granules　was　obvious　while　the　flocs　showed　little　specific　anammox　activity.　The　SEM　indicated　that　the　bacteria　in　the　outer　part　of　the　SNAD　granule　were　mainly　short　rod-shaped　and　spherical.　In　the　inner　part　of　the　SNAD　granule,　the　bacteria　were　mainly　crater-shaped.　In　flocs,　the　bacteria　were　mainly　short　rod-shaped,　spherical　and　crater-shaped.　©,　2015,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.