Comparison of reverse osmosis and nanofiltration membranes in the treatment of biologically treated textile effluent for water reuse

► Both NF and RO could effectively remove COD and salinity of the biologically treated textile effluent. ► Membrane NF90 exhibited better COD removal efficiency than membrane BW30. ► Membrane BW30 reduced salinity to a greater extent than membrane NF90. ► Pressure had a larger effect on the performance of the more permeable membrane NF90. ► Cross-flow velocity had a larger effect on the performance of membrane BW30 with rougher surface.