In　order　to　explore　the　characteristics　and　mechanisms　of　ammonia　adsorption　by　ANAMMOX　granular　sludge,　the　ammonia　adsorption　characteristics　by　ANAMMOX　granular　sludge　in　different　initial　ammonia　concentrations　and　sludge　concentrations,　as　well　as　the　influences　of　temperature,　pH,　salinity　and　metal　cations　on　the　ammonia　absorption　were　studied　respectively;　moreover,　the　adsorption　isotherms,　kinetics　models　and　thermodynamics　analysis　were　employed　to　investigate　the　adsorption　process.　Adsorption　equilibrium　was　achieved　in　about　20minutes;　the　ammonia　adsorption　capacity　was　increased　with　the　increasement　of　the　initial　ammonia　concentration,　however,　showed　a　decline　trend　with　the　increasement　of　ANAMMOX　granular　sludge　concentration;　low　temperature　was　in　favor　of　ammonia　adsorption;　the　optimal　pH　was　7.0.　Salinity　and　metal　cations　had　an　obvious　affect　on　the　ammonia　adsorption:　when　the　concentration　of　NaCl　was　5　g/L,　the　ammonia　adsorption　process　was　inhibited　completely　almost;　under　the　same　mass　concentration,　Fe3+　showed　the　strongest　inhibition　effect,　Mg2+　and　Ca2+　took　the　second　place　and　Cu2+　was　the　weakest　relatively.　The　ammonia　adsorption　process　by　ANAMMOX　granular　sludge　was　fitted　to　the　Freundlich　isotherm,　and　the　adsorption　process　was　in　line　with　the　pseudo-second-order　kinetic　model,　moreover,　was　the　combined　results　of　surface　diffusion　and　internal　diffusion.　Thermodynamic　studies　demonstrated　that　the　adsorption　process　was　a　spontaneous　exothermic　process.　©　2016,　Chinese　Society　for　Environmental　Sciences.　All　right　reserved.