Sewage sludge ash-derived materials for H2S removal from a landfill biogas

Gasquet, Valentine; Kim, Boram; Bonhommé, Anne; Benbelkacem, Hassen

doi:10.1016/j.wasman.2021.10.023

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…In the process of diffusion, H 2 S and SO 2 are adsorbed in the pores of clay to reduce the release of sulfur-containing gases, and the multiscale structure also blocks the escape of gases and the transfer of organic matter. Qie [ 29 ] et al found that SO 2 could be adsorbed by different layers of pores, but the highest amount of SO 2 was adsorbed by micropores, 33.0 mg/g; Gasquet [ 30 ] et al found that H 2 S could also be adsorbed by the micropores of activated carbon; Yang [ 31 ] et al The mechanism of H 2 S and SO 2 removal from 13X molecular sieves (with porous structure) is an adsorption-redox process, in which H 2 S is oxidized to singlet sulfur and SO 2 is oxidized to sulfuric acid attached to the pores. Meanwhile, the alkaline component and CaO react together to adsorb SO 2 and H 2 S as adsorbents [ 32 ].Therefore, the organic matter accumulates in the black mixed-layer area, but with the increase in temperature, the organic matter accumulated in the black mixed-layer area will be decomposed and diffused outward.…”

Section: Resultsmentioning

confidence: 99%

Structure of Sewage Sludge-Clay Multiscale Composite Particles to Control the Mechanism of SO2 and H2S Gas Release

Fan

Zhou

et al. 2022

Materials

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In order to address the problem of sulfur gas and other odors released in the process of using sewage sludge as a construction material, this study prepared multiscale composite particles with a “large scale-medium scale-small scale-micro scale” structure by mixing sludge with silica-alumina building materials. Analysis of the structural changes formed by the internal gas of composite particles due to diffusion at different temperatures and a study of the characteristics of SO2 and H2S release from composite particles were conducted, as well as being compared with the release characteristics of pure sludge, which clarified the mechanism of controlling sulfur-containing-gas release from composite particles. The results showed that compared with pure sludge, the sludge-clay multiscale composite particles were able to reduce the release of SO2 and H2S up to 90% and 91%, and the release temperatures of SO2 and H2S were increased to 120 °C and 80 °C, respectively. Meanwhile, the special structure of the sludge-clay multiscale composite particles and the clay composition are the main factors that hinder the diffusion of sludge pyrolysis gases. Additionally, there are three layers of “gray surface layer-black mixed layer-dark gray spherical core” formed inside the composite particles, which is the apparent manifestation of the diffusion of volatile gases. This study provides theoretical support for the application of multiscale composite particle inhibition of odor-release technology in industrial production.

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Section: Resultsmentioning

confidence: 99%

Structure of Sewage Sludge-Clay Multiscale Composite Particles to Control the Mechanism of SO2 and H2S Gas Release

Fan

Zhou

et al. 2022

Materials

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“…In the literature, one can also find the idea of creating concretes and cements with good mechanical properties, containing SSA [16][17][18][19] and lightweight aggregates [20][21][22]. Potentially, ash could also be used as a sorbent for metals from polluted waters [23][24][25][26] and, due to the high content of metals in their composition, as sorbents for some gases (e.g., hydrogen sulfide) [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Laboratory-Made and Industrial-Made Sewage Sludge Ash: Implications for Effective Management Strategy Development

Cieślik,

Ronda,

Grządka

et al. 2024

Toxics

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In the pursuit of environmentally and economically sustainable sewage sludge ash (SSA) management methods, researchers often employ laboratory-made SSA (L-SSA) as a substitute for industrial-made SSA (I-SSA) produced in fluidized bed furnaces. To check whether L-SSA is a material that imitates I-SSA well, the fractionation of metals whose presence is a significant problem during SSA management was performed. In addition, the grain distribution, specific surface area, and textural properties of the tested materials were examined. Differences in total Pb and Hg content and mobility of Cu, Ni, Mn, and Zn were observed between I-SSA and L-SSA. Larger particle sizes of L-SSA compared to I-SSA were confirmed, while comparable textural properties and specific surface area of both types of materials were maintained. Based on the results, it was concluded that L-SSA is chemically different compared to I-SSA, and that L-SSA should not be used as a reference in research focused on the design of SSA management methods. Moreover, fractionation of metals was performed in disposed fluidized beds (FBs), which are diverted to non-hazardous waste landfills without prior analysis. It has been proven that studied metals are present in FBs as abundantly as in SSA, while Cu, Mn, and Ni may show higher mobility than in I-SSA.

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