Abstract
This study investigated long-term operation (370 days) of a psychrophilic anaerobic membrane bioreactor for malting wastewater treatment and biogas production. At 18 ± 1 °C, despite changing the hydraulic retention time (HRT) and fluctuations of the influent COD, steady operation with an average COD removal efficiency of 92 ± 2 % was achieved. The biogas yield was 0.26 ± 0.04 L at STP/g CODremoved with an average methane content of 79.43 ± 2.69 %. The COD of supernatant and effluent decreased as the experiment proceeded. The membrane performance sustained the targeted flux for each period until day 325 of the operation. The results of membrane permeability recovery tests showed that cake layer formation was the predominant fouling mechanism. The microbial community study showed that the microbial community changed in response to variations of HRT and temperature.
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