To　reduce　the　cost　of　using　sludge　anaerobic　fermentation　products　as　carbon　source　and　simplify　the　process,　a　novel　method　was　proposed　to　study　the　feasibility　of　employing　sludge　fermentation　products　directly　without　separating　fermentation　broth　and　sludge　or　removing　nitrogen　and　phosphorus.　Different　dosages　of　sludge　alkaline　fermentation　products　(i.e.,　0,　20,　50,　100,　and　200　mL,　whose　SCOD　are　0,　79,　198,　396,　and　792　mg)　were　poured　into　low　C/N　ratio　municipal　waste　water　to　investigate　nitrogen　removal　and　phosphorus　release.　Results　show　that　the　nitric　oxide　(NOx--N)　decreased　first　and　then　increased　with　the　increase　of　the　dosage　of　fermentation　products.　When　the　dosage　was　50　mL　with　SCOD　of　198　mg,　nitrogen　of　12.9　mg,　and　C/N　ratio　of　15.3,　the　concentration　of　NOx--N　was　the　lowest,　being　only　1.2　mg/L　and　in　the　form　of　NO2--N,　and　the　corresponding　denitrification　efficiency　was　94.9%.　However,　with　the　increase　of　the　addition　of　fermentation　products,　the　amount　of　phosphorus　release　was　not　increased　but　decreased.　When　the　dosage　was　20　mL　with　SCOD　of　79　mg,　nitrogen　of　5.2　mg,　phosphorus　of　1.6　mg,　C/P　ratio　of　15.3,　and　C/N　ratio　of　49.5,　the　amount　of　phosphorus　release　was　the　highest　at　the　end　of　the　reaction,　reaching　23.8　mg/L.　Moreover,　nitrification　and　denitrification　processes　showed　that　the　bacteria　activity　was　inhibited　due　to　the　damage　of　the　cell　structure　of　nitrifying　bacteria　and　denitrifying　bacteria　in　fermentation　products,　which　was　also　proved　by　cell　morphology.　It　indicated　that　the　introduction　of　fermentation　did　not　affect　the　stability　of　main　microbial　community　structure　in　sewage　nitrogen　and　phosphorus　removal　system.　Therefore,　it　is　feasible　for　sludge　anaerobic　fermentation　products　to　be　directly　used　as　carbon　source.　In　this　study,　the　optimal　amount　for　denitrifying　nitrogen　removal　was　50　mL,　and　that　for　anaerobic　phosphorus　release　was　20　mL.　©　2019,　Editorial　Board　of　Journal　of　Harbin　Institute　of　Technology.　All　right　reserved.