The　deep　denitrification　problem　of　sewage　plant　effluent　was　addressed　using　type-A　molecular　sieve,　with　high　purity,　regular　crystalline　shape,　uniform　size,　and　large　adsorption　capacity.　It　was　prepared　by　hydrothermal　synthesis　using　natural　zeolite.　The　ammonia　adsorption　and　regeneration　properties　of　such　zeolitic　molecular　sieve　were　examined,　and　the　related　mechanisms　were　analyzed　from　Zeta　potential,　FTIR　and　XRD　results.　The　results　showed　that　both　the　quasi-first　and　quasi-second　order　reaction　kinetics　could　well　represent　the　ammonia　nitrogen　adsorption　process,　which　can　be　described　by　the　Langmuir　isothermal　adsorption　model.　The　maximum　saturated　adsorption　capacity　of　ammonia　nitrogen　reached　41.68mg/g.　The　regeneration　of　molecular　sieve　with　adsorption　saturation　was　simple　and　easy,　and　its　adsorption　capacity　could　be　recovered　after　desorption　by　2mol/L　NaCl　solution.　The　regeneration　rate　was　above　95%　after　five　cycles　of　adsorption　and　desorption.　Both　the　adsorption　and　regeneration　were　reversible　processes　of　each　other,　involving　ion　exchange　reactions　of　Na+　and　NH4+.　The　application　of　zeolitic　molecular　sieves　provided　an　economic　and　feasible　new　idea　for　the　deep　denitrification　in　sewage　treatment　plant.　©　2020,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.