H 2 S Adsorption from Biogas with Thermal Treatment Residues
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ORIGINAL PAPER
H2S Adsorption from Biogas with Thermal Treatment Residues Valentine Gasquet1 · Boram Kim1 · Léa Sigot2 · Hassen Benbelkacem1 Received: 18 October 2019 / Accepted: 1 March 2020 © Springer Nature B.V. 2020
Abstract Purpose Biogas cleaning is a fundamental step before its exploitation to take off potential pollutants, particularly hydrogen sulfide (H2S), from the gas and therefore to protect downstream facilities while reducing toxic emissions in the atmosphere. The aim of the presented work is to compare H2S adsorption efficiencies between different types of thermal treatment residues: a biochar, two biomass ashes and an incinerated sewage sludge. Methods H2S-adsorption experiments were realized with a real landfill biogas. All materials were characterized before and after adsorption in order to evaluate their physicochemical properties related to their reactivity. Results The results showed that biochar and biomass ashes can both remove H2S from biogas, despite these materials have very different features. Biomass ashes are basic, humid and mineral materials, whereas biochar is dry, mainly organic and very porous. On the contrary, incinerated sewage sludge could adsorb only a small amount of H 2S under tested experimental conditions, underlining the importance of the porosity of materials for sufficient H2S adsorption. Conclusions The use of thermal treatment residues for biogas cleaning has a positive impact on the environment with the reuse of waste material and can also reduce the costs of biogas as an energy vector and enable its development. Graphic Abstract
Keywords Biogas purification · Hydrogen sulfide · Adsorption · Thermal treatment residues
Statement of Novelty * Valentine Gasquet valentine.gasquet@insa‑lyon.fr 1
Univ Lyon, INSA Lyon, DEEP (Déchets Eaux Environnement Pollutions), EA 7429, 69621 Villeurbanne Cedex, France
Laboratoire Réactions Et Génie Des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, 54001 Nancy, France
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This study showed a first direct comparison between different thermal treatment residues for H2S removal by adsorption under comparable operational conditions with real landfill biogas.
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Introduction Hydrogen sulfide ( H 2S) removal from renewable gas is an important and current issue. This component is corrosive, flammable and toxic for human beings and the environment. It is produced by sulfate reduction, carried out by sulfate reducing bacteria, during sulfur-containing protein decomposition [1]. It can be easily identified due to its rotten-egg odor. It is therefore mandatory to remove H2S before the gas exploitation in order to avoid the corrosion of facilities and not to lead to SOx production during combustion [2]. For example in France, for biomethane injection into the gas grid, H2S concentration must be below 3.3 ppmv while its content can be initially higher than 5000 ppmv in raw biogas [3]. When biogas is used for power generation, H2S content can be higher, up to 200 ppmv [3], but a removal tr
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