Parte A: Avanços nas ferramentas e técnicas para estimativa de produção e tratamento de biogás em ETEs de esgoto com reatores anaeróbios Nota Técnica 3 – Dessulfuração de biogás por microaeração em reatores UASB

Abstract

The generation of hydrogen sulfide (H₂S) is a typical problem in anaerobic sewage treatment systems, such as UASB reactors. High concentrations of H₂S in biogas are undesirable, as they reduce its quality, cause corrosion of reinforced concrete and steel structures, compromise energy recovery units, generate odour emissions that are noticeable at low concentrations (0.47 ppbv and 100 ppbv), can be toxic to humans, and generate sulfur dioxide emissions during combustion. Therefore, it is necessary to propose and consolidate technologies, especially those that are simplified and low-cost, which allow the energetic use of biogas while avoiding or reducing the formation and/or emission of sulfide, such as microaeration. In view of the gaps in the literature regarding the application of microaeration to UASB reactors and biogas holders, this technical note addressed the following points of interest: (i) applicability and limitations of the technique; (ii) fundamentals of the process; (iii) design criteria; and (iv) operation and maintenance.