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. 2018 Nov 20:20:e00293.
doi: 10.1016/j.btre.2018.e00293. eCollection 2018 Dec.

Mathematical modelling of in-situ microaerobic desulfurization of biogas from sewage sludge digestion

Andrés Donoso-Bravo  1 , M Constanza Sadino-Riquelme  2 , Israel Díaz  3   4 , Raul Muñoz  4   3
Affiliations

Mathematical modelling of in-situ microaerobic desulfurization of biogas from sewage sludge digestion

Andrés Donoso-Bravo et al. Biotechnol Rep (Amst). .

Erratum in

Abstract

Microaeration can be used to cost-effectively remove in-situ H2S from the biogas generated in anaerobic digesters. This study is aimed at developing and validating an extension of the Anaerobic Digestion Model n°1 capable of incorporating the main phenomena which occurs during microaeration. This innovative model was implemented and tested with data from a pilot scale digester microaerated for ∼ 200 d. The results showed that despite the model's initial ability to predict the digester's behavior, its predicted performance was improved by calibrating the most influential parameters. The model's prediction potential was largely enhanced by adding retention parameters that account for the activity of sulfide oxidizing bacteria retained inside the anaerobic digester, which have been consistently shown to be responsible for a large share of the H2S removed.

Keywords: Biogasin-situdesulfurization; H2S; Modeling; Simulation.

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Figures

Fig. 1
Fig. 1
Time course of (a) the sludge feeding rates and O2 flow rate, (b) solids and COD concentrations, (c) VFA concentrations and (d) S2− and SO42− concentration in the digester.
Fig. 2
Fig. 2
Time course of the online measurements of the concentration of methane (a), carbon dioxide (b), hydrogen sulphide (c) and oxygen (d) in the biogas, pH in the anaerobic digestion broth (e) and biogas flow rate (f). Experimental data (circles), model simulation (continuous line).
Fig. 3
Fig. 3
Time course of the offline measurements of the total COD (a), soluble COD (b), volatile solids (c), sulfate (d), soluble hydrogen sulfide (e) and inorganic nitrogen (f) in the digester. Experimental data (circles), model simulation (continuous line).
Fig. 4
Fig. 4
Time course of the H2S concentration in the liquid (a) and gas (b) phases at different alpha values. Experimental values (symbols), Black line = No SOB, blue line = alpha 1 (no retention), Green line = alpha 0,4, orange line = alpha 0.25 and grey line = alpha 0.1 (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
Fig. 5
Fig. 5
Elemental sulfur accumulation in the experimental set-up over the operational period under microaerobic conditions.
See this image and copyright information in PMC

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