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Sewage sludge ash-derived materials for H 2 S removal from a landfill biogas.
- Source :
-
Waste management (New York, N.Y.) [Waste Manag] 2021 Dec; Vol. 136, pp. 230-237. Date of Electronic Publication: 2021 Oct 23. - Publication Year :
- 2021
-
Abstract
- H <subscript>2</subscript> S removal is a key step for biogas cleaning because this component can lead to premature corrosion of the equipment and its cleaning has a significant cost. The aim of the present work was to assess the use of sewage sludge derived ash (SSA)-materials for H <subscript>2</subscript> S removal from a landfill biogas. SSA and mixtures made with SSA, activated carbon (AC) and sand were tested for H <subscript>2</subscript> S removal. The best removal efficiency was obtained with the mixture 80%m SSA and 20%m AC, while SSA alone was not a good adsorbent under tested experimental conditions. The materials characterization helped the adsorption mechanism understanding. Indeed, results highlighted that SSA presence stabilizes the pH on a basic range, favorable for H <subscript>2</subscript> S dissociation into HS <superscript>-</superscript> then its chemisorption. On the other hand, with the microporosity of AC, the contact surface between H <subscript>2</subscript> S and oxygen was sufficiently large for chemisorption kinetics. It also appeared that the mixture with sand and AC adorbs non selectively H <subscript>2</subscript> S but also other volatile organic pollutants present in biogas. Contrariwise, with SSA/AC mixtures, H <subscript>2</subscript> S seems to be selectively chemisorbed.<br /> (Copyright © 2021 Elsevier Ltd. All rights reserved.)
- Subjects :
- Adsorption
Biofuels
Charcoal
Waste Disposal Facilities
Hydrogen Sulfide
Sewage
Subjects
Details
- Language :
- English
- ISSN :
- 1879-2456
- Volume :
- 136
- Database :
- MEDLINE
- Journal :
- Waste management (New York, N.Y.)
- Publication Type :
- Academic Journal
- Accession number :
- 34700163
- Full Text :
- https://doi.org/10.1016/j.wasman.2021.10.023