A Two-Stage Biogas Desulfurization Process Using Cellular Concrete Filtration and an Anoxic Biotrickling Filter

Morgane Poser, Luis Rodolfo Duarte E. Silva, Pascal Peu, Éric Dumont and Annabelle Couvert
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Morgane Poser: Ecole Nationale Supérieure de Chimie de Rennes, CNRS, Université Rennes, ISCR—UMR 6226, 35000 Rennes, France
Luis Rodolfo Duarte E. Silva: Ecole Nationale Supérieure de Chimie de Rennes, CNRS, Université Rennes, ISCR—UMR 6226, 35000 Rennes, France
Pascal Peu: INRAe, 17, Avenue de Cucillé—CS 64427, 35044 Rennes, France
Éric Dumont: IMT Atlantique, CNRS, GEPEA, Nantes Université, UMR 6144, 44000 Nantes, France
Annabelle Couvert: Ecole Nationale Supérieure de Chimie de Rennes, CNRS, Université Rennes, ISCR—UMR 6226, 35000 Rennes, France

Energies, 2022, vol. 15, issue 10, 1-14

Abstract: A two-stage desulfurization process including an abiotic filtration using cellular concrete waste (first stage) and an anoxic biotrickling filter filling with an inoculated expanded schist material (second stage) was investigated to remove H 2 S in mimic biogas with limited O 2 amount (ranged from 0.5 to 0.8%). The two-stage process was able to satisfactorily remove H 2 S for all experimental conditions (RE > 97%; H 2 S concentration = 1500 mg m −3 ; total Empty Bed Residence Time (EBRT) = 200 s; removal capacity (RC) = 26 g m −3 h −1 ). Moreover, at a total EBRT = 360 s (i.e., 180 s for each stage), the H 2 S loading rate (LR) was almost treated by the bed of cellular concrete alone, indicating that abiotic filtration could be applied to satisfactorily remove H 2 S contained in the gas. According to the H 2 S concentration entering the biotrickling filter, the majority end-product was either elemental sulfur (S 0 ) or sulfate (SO 4 2− ). Thus, the ability of the abiotic filter to remove a significant part of H 2 S would avoid the clogging of the biotrickling filter due to the deposit of S 0 . Consequently, this two-stage desulfurization process is a promising technology for efficient and economical biogas cleaning adapted to biogas containing limited O 2 amounts, such as landfill biogas.

Keywords: H 2 S; cellular concrete; biotrickling filter; biogas; desulfurization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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