Industrial　wastewater　discharged　into　sewer　systems　is　often　characterized　by　high　nitrate　contents　and　low　C/N　ratios,　resulting　in　high　treatment　costs　when　using　conventional　activated　sludge　methods.　This　study　introduces　a　partial　denitrification-anammox　(PD/A)　granular　process　to　address　this　challenge.　The　PD/A　granular　process　achieved　an　effluent　TN　level　of　3.7　mg/L　at　a　low　C/N　ratio　of　2.3.　Analysis　of　a　typical　cycle　showed　that　the　partial　denitrification　peaked　within　15　min　and　achieved　a　nitrate-to-nitrite　transformation　ratio　of　86.9%.　Anammox,　which　was　activated　from　15　to　120　min,　contributed　86.2%　of　the　TN　removal.　The　system　exhibited　rapid　recovery　from　post-organic　shock,　which　was　attributed　to　significant　increases　in　protein　content　within　TB-EPS.　Microbial　dispersion　and　reassembly　were　observed　after　coexistence　of　the　granules,　with　Thauera　(39.12%)　and　Candidatus　Brocadia　(1.25%)　identified　as　key　functional　microorganisms.　This　study　underscores　the　efficacy　of　PD/A　granular　sludge　technology　for　treating　low-C/N　nitrate　wastewater.