Performance results of the treatment of stillage using two-stage anaerobic digestion coupled to membrane filtration at different operating conditions

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Courtesy of IWA Publishing

The production of ethanol is results in generation of large amounts of liquid residue (stillage). Anaerobic membrane bioreactors (AnMBRs) are a promising technology primarily for the treatment of high strength wastewater, having lower energy requirements as compared to aerobic ones and higher effluent quality as compared to conventional anaerobic reactors. AnMBR applied to stillage treatment offers the possibility of producing energy through utilization of biogas and recovering nutrients, if followed by land application on biomass crops or post-treatment systems such as reverse osmosis. This study evaluated the treatment of stillage using two-stage anaerobic digestion coupled to membrane filtration, aiming the identification and optimization of the limiting steps of anaerobic digestion and reduction of the influence of acidogenic bacteria on filtration performance.

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