Anaerobic membrane bioreactor was used to treat the effluent from an industrial UASB reactor receiving seafood processing wastewater. Operation in liquid circulation (LQ) was compared with the addition of granular activated carbon (LQ+GAC) and the introduction of biogas to partially replace the liquid recirculation flow (LQr+GAC+G). In all treatments, COD was removed to well under the secondary effluent standard of 120 mg/L. HRT did not cause much difference in performance but GAC addition provided superior performance in membrane fouling control. Fouling rate, the transmembrane pressure developed over time in mbar/d, was reduced by 90%, 93%, and 87% in LQ+GAC, and the additional of 54%, 55%, and 90% with biogas circulation at HRT 4, 6, and 8 h, respectively. Minimal substitution of liquid with biogas in circulation with GAC was effective and less energy intensive. SEM image showed that GAC and partial biogas supply could shift the fouling behavior. (C) 2016 Elsevier B.V. All rights reserved.