Abstract
Anaerobic membrane bioreactor (AnMBR) is considered an important alternative biogas source while efficiently purifying sewage. Improving the methane (CH4) content in the AnMBR biogas in a cost-effective way is closely related to its future availability. In the study, a novel system was proposed for in-situ biogas upgrading using AnMBR effluent. The system achieves the dual goals of bioenergy recovery from sewage and biogas upgrading. Biogas upgrading results showed that the CH4 content in upgraded biogas was 90.3% at biogas flow of 0.36 L/h, effluent flow of 2.88 L/h, and normal temperature and pressure. The mechanism analysis showed that efficient upgrading with AnMBR effluent depended on sufficiency alkali products and less N2 and O2. Meanwhile, conversion efficiency of chemical oxygen demand (COD) to CH4 of AnMBR was 78.5% under hydraulic retention time (HRT) of 8 h and organic load rate of 1.2 g COD/L/d. The novel system provides a new solution for cost-effective in-situ biogas upgrading using AnMBR effluent by integration of AnMBR with scrubbing column.
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