H2S Removal with Sorbent Obtained from Sewage Sludges

Papurello, Davide; Lanzini, Andrea; Bressan, Maurizio; Santarelli, Massimo

doi:10.3390/pr8020130

Cited by 12 publications

(5 citation statements)

References 31 publications

(38 reference statements)

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“…Analyzers are readily accessible for purchase in the marketplace and have found widespread application [11,12] to monitor or identify certain gases for a number of applications. The following are some of the most prevalent H 2 S measurement methods that were utilized in the development of the analyzers.…”

Section: Analyzersmentioning

confidence: 99%

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

2022

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Natural gas, biogas, and refinery gas all include H2S, which has adverse effects not only on the environment and human health but also on the equipment and catalysts that are employed in the relevant processes. H2S is removed from the aforementioned gases using a variety of techniques in order to fulfill the necessary sales criteria and for reasons of safety. The adsorption method stands out among various other approaches due to its straightforward operation, high level of efficiency, and low overall cost. This technique makes use of a variety of adsorbents, such as metal-organic frameworks (MOFs), activated carbon, and zeolites. The use of zeolite-based adsorbents is by far the most common of these various types. This is due to the specific properties of zeolite-based adsorbents, which include a high adsorption capacity, the ability to be regenerated, a high temperature stability, a diversity of types, the possibility of modification, high efficiency, and low cost. In addition, research is being done on adsorbents that are made from inexpensive raw materials in order to remove H2S. This article focuses on zeolites, zeolite modifications, and wastes as an adsorbent for the removal of H2S, all of which have been investigated fruitfully in recent years, as well as the promising applications of zeolites.

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Section: Analyzersmentioning

confidence: 99%

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

2022

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“…For example, Han et al (2020) indicated that a higher gas velocity led to a reduced contact time that decreased the H 2 S removal of biochar derived from rice husk. In contrast, increasing the adsorption bed height would benefit the H 2 S removal due to the prolonged contact time (Meri et al 2018;Papurello et al 2020;Sawalha et al 2020). However, the resistance to the flow also would become higher (i.e., higher head loss or pressure drop) because of the strong mechanical energy dissipation (Scheufele et al 2021).…”

Section: Items Valuesmentioning

confidence: 99%

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Huang

Wang

Bai

et al. 2022

Biochar

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Hydrogen sulfide (H2S) removal has been a significant concern in various industries. In this study, food waste digestate-derived biochar (DFW-BC), a by-product of food waste treatment with abundant minerals, was assessed for removing H2S from different simulated biogas containing oxygen (O2) and carbon dioxide (CO2) and under different moisture (H2O) contents (0% and 20%) of biochar. The influencing mechanisms of the gas conditions combined with the moisture contents were also investigated. The results showed an H2S removal of 1.75 mg g−1 for dry biochar under pure H2S, 4.29 mg g−1 for dry biochar under H2S + O2, 5.29 mg g−1 for humid biochar under H2S, and 12.50 mg g−1 for humid biochar under H2S + O2. For dry DFW-BC, the high Fe content was responsible for the O2 enhancement. In contrast, O2 + H2O activated the catalytic H2S oxidation of the less reactive minerals (mainly Ca). The inhibition of CO2 on H2S adsorption was not obvious for dry DFW-BC; the specific pore structure may have provided a buffer against the physisorption competition of CO2. However, when H2O was present on DFW-BC, the changes in critical biochar properties and sulfur speciation as opposed to that without H2O implied an evident occurrence of CO2 chemisorption. This CO2 chemisorption partially hindered O2 + H2O enhancement, decreasing the H2S removal capacity from 12.50 to 8.88 mg g−1. The negative effect was ascribed to mineral carbonation of CO2, neutralizing the alkaline surface and immobilizing metal oxides, which thus reduced the acceleration in H2S dissociation and activation in catalytic H2S oxidation by O2 + H2O. Graphical Abstract

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“…6 Of these, adsorptive desulfurization stands out as a safe, dependable, efficient, and sustainable option. 7 In recent years, exploring raw materials with wide sources and low cost to prepare efficient adsorbents has attracted much attention. A variety of carbon-based adsorbents have been synthesized, utilizing resources such as biomass waste, 8 sludge, 9,10 or a combination of multiple wastes.…”

Section: Introductionmentioning

confidence: 99%

“…Current desulfurization methods include amine scrubbing, Claus process, biological methods, metal oxide adsorption, and adsorptive desulfurization . Of these, adsorptive desulfurization stands out as a safe, dependable, efficient, and sustainable option …”

Section: Introductionmentioning

confidence: 99%

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

Wang,

Li,

Wang

et al. 2023

Energy Fuels

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The mitigation of toxic hydrogen sulfide (H2S) in oil field gas is crucial as a result of its significant health and environmental repercussions. This research developed an efficient H2S adsorbent using oil sludge, a hazardous waste of oil production, by adding the alkaline activator KOH before pyrolysis. The performance of the adsorbent was assessed with a fixed bed in humid gas conditions. The adsorption kinetics were characterized theoretically, and reaction pathways were subsequently proposed. Results showed that the adsorbent activated by KOH presented a higher desulfurization capacity than those activated by NaOH, Na2CO3, and K2CO3. The addition of KOH increased the volume of the mesopores and the content of surface active sites. However, an optimal KOH concentration emerged when assessing the desulfurization capacity concerning the mass of the adsorbent or activator. The kinetic investigations revealed that the H2S adsorption process obeyed the Langmuir model and was modulated by both external diffusion and internal diffusion. In addition, the role of KOH during the H2S adsorption process was identified through the analysis of desulfurization products on the deactivated adsorbent. As a result of being catalyzed by KOH, elemental sulfur was oxidized to high-valent sulfuric acid and neutralized to sulfate. This research provides innovative perspectives on devising economical oil-sludge-based adsorbents, facilitating the concurrent processing of oil field gas and oil sludge in oilfield operations.

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H2S Removal with Sorbent Obtained from Sewage Sludges

Cited by 12 publications

References 31 publications

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

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H2S Removal with Sorbent Obtained from Sewage Sludges

Cited by 12 publications

References 31 publications

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

Recent Attempts on the Removal of H2S from Various Gas Mixtures Using Zeolites and Waste-Based Adsorbents

The influencing mechanism of O2, H2O, and CO2 on the H2S removal of food waste digestate-derived biochar with abundant minerals

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H2S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism

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Product

Resources

About

Optimization of Oil-Sludge-Based Adsorbents for the Treatment of Toxic H₂S in Oilfield Gases: Preparation, Modification, Characterization, and Adsorption Mechanism