Reusing　treated　greywater　indoors　in　buildings　is　an　advanced　strategy　to　increase　the　utilization　of　limited　water　resources,　but　currently　there　is　a　lack　of　feasible　technologies　for　efficiently　purifying　greywater　indoors.　In　this　study,　we　construct　the　heterogeneous　TiO2-stainless　steel　mesh　(SSM)　interface　with　photocatalytic　degradation　of　sodium　dodecylbenzene　sulfonate　(SDBS)　by　under　vacuum　ultraviolet　(VUV)　irradiation.　At　the　initial　SDBS　of　10　mg/L,　the　degradation　rates　of　SDBS　with　UV/TiO2-SSM　and　VUV/TiO2-SSM　process　were　53　%　and　74　%　respectively　within　50　min.　The　results　of　specific　scavengers　experiments　and　EPR　analysis　revealed　that　the　·OH,　h+　and　direct　photolysis　contributed　to　SDBS　degradation　and　mineralization.　The　degradation　rate　of　SDBS　in　VUV/TiO2-SSM　process　was　higher　at　weak　acid　or　weak　alkali　conditions,　while　the　performance　of　UV/TiO2-SSM　process　was　better　at　alkaline　conditions.　Both　Cl−　and　HCO3−　could　inhibit　SDBS　degradation,　while　SO42−　slightly　promoted　the　degradation.　Active　oxygen　species　mainly　degrade　SDBS　in　two　ways:　by　attacking　the　α　carbon,　β　carbon,　or　branched　chain　carbon　on　the　alkane　chain;　or　by　attacking　the　adjacent　carbon　on　the　alkane　chain,　resulting　in　the　formation　of　three　branch　forms　of　products.　The　toxicity　of　the　intermediate　products　shows　a　decreasing　or　stable　trend.　The　experiment　shows　that　UV　or　VUV　photocatalytic　TiO2-SSM　has　a　good　prospect　of　removing　anionic　surfactant　in　the　real　greywater.　This　study　provides　strategies　for　the　development　and　design　of　indoor　water　reuse　technologies　and　devices　in　buildings.　©　2024