A　three-dimensional　biofilm-electrode　reactor　(3DBER)　was　integrated　with　sulfur　autotrophic　denitrification　(SAD)　to　improve　nitrogen　removal　performance　for　wastewater　reclamation.　The　impacts　of　influent　carbon/nitrogen　(C/N)　ratio,　electric　current,　and　hydraulic　retention　time　(HRT)　were　evaluated.　The　new　process,　abbreviated　as　3DBER-SAD,　achieved　a　more　stable　denitrification　compared　to　the　recently　studied　3DBER　in　literature.　Its　nitrogen　removal　improved　by　about　45　%　as　compared　to　3DBER,　especially　under　low　C/N　ratio　conditions.　The　results　also　revealed　that　the　biofilm　bacteria　community　of　3DBER-SAD　contained　21.1　%　of　the　genus　Thauera,　19.3　%　of　the　genus　Thiobacillus　and　Sulfuricella,　as　well　as　5.3　%　of　the　genus　Alicycliphilus,　Pseudomonas,　and　Paracoccus.　The　synergy　between　these　heterotrophic,　sulfur　autotrophic,　and　hydrogenotrophic　denitrification　bacteria　was　believed　to　cause　the　high　and　stable　nitrogen　removal　performance　under　various　operating　conditions.