Polyvinylidene　fluoride　(PVDF)　hollow　fiber　ultrafiltration　membranes　were　modified　with　carbon　nanotubes　(CNT).　Hybrid　pre-ozonation　and　CNT　modification　were　investigated　by　experimentally　manipulating　the　ozonation　process,　threshold　flux,　and　membrane　fouling.　The　results　showed　that　the　threshold　fluxes　of　the　unmodified　membrane　and　hybrid　process　were　45　L•(m2•h)-1　and　81　L•(m2•h)-1,　respectively.　Additionally,　the　fouling　rate　of　the　hybrid　process　was　about　0.001　37　kPa•min-1•L-1•m2•h,　which　was　notably　lower　compared　to　other　process.　The　results　showed　that　the　filtration　volume　under　threshold　flux　was　higher　than　that　under　critical　flux　with　the　same　CNT　loading　mass　and　ozone　dosage.　This　comparison　indicated　that　membrane　fouling　was　alleviated　under　threshold　flux　and　that　the　corresponding　operation　period　was　extended.　Through　the　carbon　balance　experiment,　the　fouling　capacity　and　recoverability　improved　remarkably　after　CNT　modification.　Additionally,　ozonation　could　enhance　the　recoverability　of　membranes.　The　hybrid　process　examined　in　this　study　could　dramatically　improve　the　permeability　and　extend　the　operation　time　of　the　ultrafiltration　membrane.　©　2019,　Science　Press.　All　right　reserved.