Remoção de nutrientes e produção de biogás de lodo aeróbio em biorreator anaeróbio de membrana dinâmica

Abstract

Sewage sludge has great potential in resource recovery, as a source of nutrients, water for reuse and energy production in the form of biogas. The emerging technology of dynamic membrane anaerobic bioreactors (BRANMD) has grown in recent years due to factors such as low-cost membrane module, operational ease, low sludge production as well as increased methane production compared to conventional anaerobic reactors. In this research were evaluated the potential of production and efficiency in nutrient removal from the treatment of aerobic sludge in dynamic membrane anaerobic bioreactor. The dynamic membrane was developed in a 90 μm medium aperture polyethylene mesh and the reactor was operated in two stages with different fluxes. The formation of the dynamic membrane provided high removal of turbidity in the permeate, reaching 99% efficiency, in both steps. Due to the retention capacity, the effective biodegradation of the material contributed to a 97% removal of COD. The system showed promising results in nutrient recovery, presenting satisfactory efficiency of 69% and 79% for NTK and 70% and 73% for total phosphorus. The values obtained show a higher production of biogas when operating with higher flow, reaching a production of 0.35 L N / gDQO.