To　further　utilize　carbon　source,　endogenous　denitrification　reactor　(ED-SBR),　partial　nitrification　reactor　(PN-SBR)　and　anammox　reactor　(AMX-UASB)　were　used　to　treat　low　C/N　domestic　wastewater　and　industrial　wastewater　rich　in　nitrate.　The　feasibility　of　simultaneous　denitrification　of　domestic　wastewater　and　nitrate　wastewater　was　discussed.　77.5%　of　the　organic　matter　in　the　influent　could　be　converted　into　internal　carbon　source　in　the　ED-SBR　anaerobic　stage,　and　endogenous　denitrification　was　carried　out　in　the　anoxic　stage.　The　average　NO3--N　concentration　in　the　effluent　was　3.4mg/L,　reaching　an　average　removal　rate　of　90.4%;　PN-SBR　can　achieve　stable　half　shortcut　nitrification　under　low　do　(0.1~0.3mg/L),　Nitrite　Accumulation　Ratio　(NAR)　is　96.3%,　and　the　ratio　of　NO2--N/NH4+-N　in　effluent　is　about　1.01,　which　can　provide　stable　substrate　for　anammox;　AMX-UASB　reduces　NH4+-N　and　NO2--N　in　influent　is　converted　to　N2　and　NO3--N.　The　average　effluent　of　NO3--N　was　7.12mg/L.　The　average　TIN　concentration　of　inlet　and　outlet　water　was　77.5　and　8.2mg/L　respectively,　and　the　average　TIN　removal　rate　was　89.2%.　In　order　to　couple　domestic　sewage　with　high　NO3--N　content,　providing　an　effective　way　to　remove　nitrogen　from　wastewater　simultaneously.　©　2022,　Editorial　Board　of　China　Environmental　Science.　All　right　reserved.