Two-phased UASB-septic tank was feasible, as defined by high removal of organic material, for on-site treatment of synthetic BW (HRT 4.4 d+1.4 d; OLR 0.301 kgCOD/m3 d) and DPWW (HRT 3.5 d+1.5 d; OLR 0.191 kgCOD/m3 d) at low temperatures (10–20 °C). Moreover, CODdis removal was around 70% at 15 and 10 °C indicating good biological activity of the reactor sludges.