Membrane　bioreactor　(MBR)　and　nanofiltration　(NF)　hybrid　process　has　dominated　in　the　treatment　of　leachate,　however,　NF　concentrate　generated　from　the　process　remains　a　challenge　to　be　addressed.　Given　the　high　content　of　humic　substances　(HS)　in　NF　concentrate,　a　promising　approach　by　using　a　two-stage　tight　ultrafiltration　(TUF)　process　for　recovering　HS　as　a　water-soluble　fertilizer　was　proposed.　The　effect　of　operating　factors　on　membrane　flux　and　rejection　of　organic　matters,　and　the　concentration　and　desalination　performance　of　this　TUF　process　were　investigated　on　pilot　scale.　The　pressure　and　temperature　posed　significant　influence　on　the　flux,　while　slight　impact　on　the　rejection　of　organics,　and　pH　had　negligible　effect　on　the　flux　and　the　retention　of　organics.　During　the　concentration　and　desalting　process,　the　chemical　oxygen　demand　(COD)　retention　increased　slightly　from　91%　to　94%,　and　the　rejections　of　divalent　and　monovalent　ions　had　the　respective　range　of　21-62%　and　10-26%,　except　chloride　ion　with　a　negative　rejection.　The　results　demonstrated　that　HS　dominated　in　organics　could　be　effectively　separated　and　refined　from　inorganic　salts.　The　end　concentrate　achieved　with　the　two-stage　TUF　process　can　meet　the　requirements　of　Chinese　nation　professional　standards　for　water-soluble　fertilizers　containing　HS.　This　study　illustrates　the　feasibility　of　recycling　HS　from　NF　concentrate.　(C)　2017　Elsevier　Ltd.　All　rights　reserved.