Journal
BIOCHEMICAL ENGINEERING JOURNAL
Volume 125, Issue -, Pages 171-179Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2017.06.009
Keywords
ADM1; Biogas desulfurization; Microaeration; Modeling and simulation; UASB; Wastewater treatment
Funding
- Czech Ministry of Education, Youth and Sports [MSM6046137308]
- Ghent University [BOF - 01SF2012]
- Research Foundation-Flanders (FWO)
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During anaerobic treatment of sulfate-rich wastewater, biogas with a high concentration of hydrogen sulfide (H2S) is produced. Since H2S is toxic to humans and can cause corrosion of concrete and steel, it needs to be removed before using the biogas for energy and heat production. Biogas desulfurization can be achieved by blowing small amount of air into the anaerobic reactor, a process which is termed microaeration. In this study, the generally accepted Anaerobic Digestion Model No. 1 (ADM1) was extended with sulfate reduction and sulfide oxidation to optimize the microaeration process during the anaerobic treatment of sulfate-rich wastewater. The resulting model, termed ADM1-S/O, was validated against experimental data from two reactors operated under anaerobic and microaerobic conditions, showing a good description of H2S concentrations in the biogas. The biomass composition in both reactors was not significantly affected by microaeration. Additionally, scenario analyses were carried out to assess the effect of the influent S:COD ratio and the aeration intensity (O-2:S ratio) on the steady state reactor behavior. (C) 2017 Elsevier B.V. All rights reserved.
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