This work aimed to Study the treatment of wastewater generated from fruit juice industry (24-30 m(3)/batch) Three treatment schemes have been investigated The first treatment scheme was a batch activated sludge (AS) system and was operated at different aeration time tip to 48 h The second scheme was two-stage up-flow anaerobic sponge reactors (UASRs) Two-stage UASRs were operated at a total hydraulic retention time (HRT) of 13 h corresponding to art organic loading rate (OLR) of 8 7 kg COD/m(3) d. While, the third treatment scheme consisted of a two-stage UASR followed by an AS system which was operated at three different HRTs namely 10, 12. and 14 h Long term experiments indicated the superiority of the third treatment scheme which operated at a total HRT of 23 h (UASRs 13 11 and AS 10 h) in terms of chemical oxygen demand (COD). biochemical oxygen demand (BOD5) total Suspended solids (TSS) and oil & grease removal The integrated system achieved an overall removal efficiency of 97 5% for COD, 99 2% for BOD5. 94 5% for TSS and 98 9% for oil & grease The treated wastewater produced from the UASR-AS system complied with the standards set by the Egyptian law regulating the reuse of treated wastewater in agricultural purposes. (C) 2009 Elsevier B V All rights reserved