For　cities　and　various　types　of　constructions,　the　recycling　and　reuse　of　wastewater　can　be　an　important　and　unconventional　water　source.　However,　water　quality　must　meet　relevant　standards,　especially　with　respect　to　organic　matter.　In　this　study,　secondary　effluents　from　a　large　sewage　plant　in　a　northern　city　in　China　were　analyzed.　The　removal　efficiencies　for　soluble　organic　matter　and　the　characteristics　of　nanofiltration　(NF)　membrane　fouling　of　UV-TiO2　photocatalysis　and　GAC　adsorption　were　studied,　and　a　combined　UV-TiO2/GAC/NF　process　was　developed.　The　removal　of　organic　matter　and　the　controlling　effect　of　membrane　fouling　in　the　combined　UV-TiO2/GAC/NF　process　was　evaluated.　The　types　and　molecular　weights　of　organic　matter,　which　influenced　the　degree　of　membrane　fouling,　were　analyzed.　The　results　indicated　that　both　the　UV-TiO2　and　GAC　techniques　can　alleviate　irreversible　NF　membrane　fouling　and　reduce　the　attenuation　rate　of　membrane　flux　to　some　extent.　Compared　to　individual　UV-TiO2　or　GAC　processes,　the　degree　of　irreversible　membrane　fouling　in　the　combined　UV-TiO2/GAC　process　was　reduced　by　48.7%　and　61.4%,　respectively.　Protein-like　and　humus-like　components　were　dominant　in　the　irreversible　membrane　fouling,　and　organic　components　with　relative　molecular　mass　of　less　than　3×103　and　between　30×103　and　100×103　were　dominant　in　causing　a　decrease　in　NF　membrane　flux.　Organic　content　was　efficiently　removed　using　UV-TiO2/GAC/NF　combined　process,　achieving　a　removal　rate　for　COD,　DOC,　and　UV254　of　45.7%,　74.5%,　and　89.2%,　respectively.　This　study　provides　technical　support　for　the　advanced　treatment　and　multi-path　reuse　of　unconventional　water　sources　for　cities　and　various　types　of　constructions.　©　2019,　Science　Press.　All　right　reserved.