The　objective　of　this　work　was　to　investigate　the　disinfection　effectiveness　of　several　technologies,　i.e.　chlorination,　ultraviolet　(UV)　irradiation,　ozonation,　and　the　combination　chlorination　with　UV　irradiation　or　ozonation,　on　the　removal　of　indicator　microorganisms　and　the　formation　of　trihalomethanes　(THMs)　related　to　available　chlorine　dosage　from　a　pilot-scale　MBR　effluents.　The　combination　technologies　exhibited　much　higher　disinfection　effectiveness　than　that　of　single　one.　The　total　coliform　of　disinfected　MBR　effluents　disinfected　in　both　UV-chlorination　combination　process　(at　an　UV　dose　of　25　mJ/cm2,　and　an　available　chlorine　dose　of　3　mg/L)　and　ozonation-chlorination　combination　process　(at　an　ozone　dose　of　6　mg/L　and　an　available　chlorine　dose　of　4　mg/L)　could　meet　the　requirement　of　Reuse　of　Urban　Recycling　Water-Water　Quality,　a　standard　for　Urban　Miscellaneous　Water　Consumption　(GB/T18920-2002).　The　concentration　of　THMs　increased　with　the　increase　of　available　chlorine　dosage.　In　comparison　with　UV-chlorination　combination　process,　ozonation-chlorination　combination　process　could　effectively　reduce　the　THM　formation..　The　concentration　of　THMs　was　14.11　μg/L　at　an　available　dose　of　4　mg/L,　which　decreased　by　37.19%　compared　with　chlorination　disinfection.　©,　2014,　Science　Press.　All　right　reserved.