Part A: Advances in tools and techniques for estimating biogas production and treatment in anaerobic-based STPs Technical Note 3 - Biogas desulfurization by microaeration in UASB reactors

Abstract

The generation of hydrogen sulfide (H2 S) is a typical problem in anaerobic sewage treatment systems, such as UASB reactors. High concentrations of H2 S in biogas are undesirable, as they reduce its quality, cause corrosionofreinforced concrete and steel structures, compromise the energy recovery units, generate odour emissions that are noticeable at low concentrations (0.47 ppbv e 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 simplified and of low-cost, that allow the use of biogas energy, avoiding or reducing the formation and/or emission of sulfide, such as microaeration. In view of the gaps in the literature on 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.