Article Dans Une Revue Processes Année : 2025

Development of an Innovative and Sustainable Technological Process for Biogas Purification Through the Reuse of Autoclaved Aerated Concrete Waste

Résumé

This study demonstrated the effectiveness of using autoclaved aerated concrete AAC waste as a low-cost filtering material for removing hydrogen sulfide (H2S) from gas streams. A long-term experiment (89 days) was conducted in a packed bed reactor to purify synthetic biogas composed of N2, CO2, H2S, and O2. Optimal H2S removal efficiencies, reaching up to 100%, were achieved under highly acidic conditions (pH ≈ 1–3) and low oxygen concentrations (<1%). In the presence of oxygen, calcium oxides in the AAC waste react with H2S to form gypsum (CaSO4 2H2O). The simultaneous removal of both oxygen and H2S by AAC waste, following an approximate 2:1 molar ratio, may be particularly beneficial for biogas streams containing unwanted traces of oxygen. The transformation and lifespan of AAC waste were monitored through sulfur accumulation in the material and pressure drop measurements, which indicated structural changes in the AAC waste. At the end of its lifespan, the AAC waste exhibited an H2S removal capacity of 185 gH2S kgAAC−1. This innovative and sustainable process not only provides a cost-effective and environmentally sound solution for the simultaneous removal of H2S and O2 from biogas, but also promotes waste valorization and aligns with circular economy principles.

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hal-05115198 , version 1 (16-06-2025)

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Eric Dumont, Noé Kautzmann, Annabelle Couvert. Development of an Innovative and Sustainable Technological Process for Biogas Purification Through the Reuse of Autoclaved Aerated Concrete Waste. Processes, 2025, 13 (6), pp.1767. ⟨10.3390/pr13061767⟩. ⟨hal-05115198⟩
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