Valorization of sewage sludge through catalytic sub- and supercritical water gasification

Yan, Mi; Kanchanatip, Ekkachai; Zheng, Rendong; Zhong, Yingjie; Mubeen, Ishrat

doi:10.1016/j.joei.2020.01.004

Cited by 28 publications

(5 citation statements)

References 52 publications

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“… The CO bond has the highest MBO and is the most difficult to break during HTC. As can be seen from Table , the MBO and BDE have a good correspondence; the smaller the MBO, the smaller is the BDE and the worse is the thermal stability of the chemical bond in HTC …”

Section: Resultsmentioning

confidence: 78%

“…Therefore, the influence of temperature and pressure on BDE values is very little and can be ignored As can be seen from Table 2, the MBO and BDE have a good correspondence; the smaller the MBO, the smaller is the BDE and the worse is the thermal stability of the chemical bond in HTC. 39 In addition, the differences in the bond order and BDE can also be explained by electronic effects and structural differences, as shown in Figure 2. The common electronic effects can be divided into the following categories: (1) field effect, which refers to the effect of substituents on the reaction center at the other end of the bond; (2) conjugation effect, which is generally an effect in the distribution of π electrons in the system changes due to the mutual influence between atoms; (3) induction effect, which is the effect of different polarities (electronegativity) of atoms or groups in molecules that causes the bonding electron cloud to move in a certain direction along the atomic chain.…”

Section: Resultsmentioning

confidence: 99%

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Study on Chemical Bond Dissociation and the Removal of Oxygen-Containing Functional Groups of Low-Rank Coal during Hydrothermal Carbonization: DFT Calculations

Dang

Wang

et al. 2021

ACS Omega

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The molecular structure model of lignite was constructed, and the dissociation and removal mechanism of different C–O bonds and oxygen-containing functional groups was investigated using density functional theory (DFT) calculations. First, the bond order and bond dissociation enthalpy (BDE) were analyzed to predict the strength of different chemical bonds, and differences in the BDE and bond order were related to the difference in the fragment structure and electronic effects. The first group to break during hydrothermal carbonization (HTC) is the methyl of Ph(CO)O–CH3, followed by the C–O of CH3–OC(O)OH; the hydroxyl in Ph–OH is the most thermally stable group, followed by the hydroxyl in CH3OC(O)–OH. In addition, the orbital localization analysis has also been carried out. All three chemical bonds of Ph(CO)OCH3 show the characteristics of σ bond, while Ph(CO)OCH3 and Ph(CO)–OCH3 with the Mayer bond order (MBO) greater than 1 also contains certain π bond characteristics. The lignite van der Waals (vdW) surface electrostatic potential (ESP) was constructed and visualized, and the results showed that the oxygen-containing functional groups mainly contributed to the area with a large absolute ESP. Finally, weak interactions between water molecules and lignite at different sites were described by independent gradient model (IGM) analysis. Models A, B, and E formed weak interactions with the hydrogen bond as the main force; model E showed the weakest hydrogen bond, while model C showed van der Waals interaction as the dominant force. In addition, some steric effect was also observed in model D.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Study on Chemical Bond Dissociation and the Removal of Oxygen-Containing Functional Groups of Low-Rank Coal during Hydrothermal Carbonization: DFT Calculations

Dang

Wang

et al. 2021

ACS Omega

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“…If HTG is carried out at low temperatures (374-550 • C), the production of methane is thermodynamically favorable over the production of a hydrogenrich gas. To increase the selectivity of hydrogen over methane, the temperature needs to be between 550 and 700 • C or the catalysts need to be used at low temperatures to enhance the water-gas shift reaction [69,70]. Some works on the HTG of sewage sludge, and the main operating conditions and product yields, are shown in Table 6.…”

Section: Hydrothermal Gasificationmentioning

confidence: 99%

“…Differences between sub-and supercritical sewage sludge HTG in a batch reactor were studied by Yan et al [70]. Their work focused on the effects of temperature and water-soluble additives on the process and resultant product characteristics.…”

Section: Hydrothermal Gasificationmentioning

confidence: 99%

An Overview of the Thermochemical Valorization of Sewage Sludge: Principles and Current Challenges

Rijo,

Nobre,

Brito

et al. 2024

Energies

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With the increase in the world population and economic activity, the production of sewage sludge has grown, and its management has become an environmental problem. The most traditional method of managing sewage sludge is to dispose of it in landfills and on farmland. One way to valorize sewage sludge is to use thermochemical conversion processes to produce added-value products such as biochar, biofuels, and renewable gases. However, due to the high moisture content, thermochemical conversion using processes such as pyrolysis and traditional gasification involves multiple pre-treatment processes such as material drying. Hydrothermal thermochemical processes usually require high pressures, which pose many challenges to their application on a large scale. In this work, the advantages and disadvantages of the different existing thermochemical processes for the recovery of sewage sludge were analyzed, as well as the resulting industrial and environmental challenges. A SWOT analysis was carried out to assess the different thermochemical processes in terms of technical feasibility, economic viability, and broader market considerations.

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“…Considerando o reconhecimento feito pelo Comitê de Direitos Econômicos, Sociais e Culturais da Organização das Nações Unidas (ONU, 2018) de que a água é essencial, infere-se que esta interação deva passar pela adoção de políticas públicas e o engajamento pessoal, observa-se que 31 países do Norte da África e do Oriente Médio estão em indigência hídrica (ONU, 2019a), ao passo que 2/3 da população do mundo, equivalentes a quatro bilhões de pessoas, passam pelo menos um mês ao ano em escassez hídrica grave (MEKONNEN;HOEKSTRA, 2016;SALEHI, 2021). É imperativo buscar formas de melhorar a disponibilidade deste recurso para as atuais e futuras gerações (GIMELLI, 2018;GIROLAMO et al, 2019;VOS et al, 2019, ZHAO et al, 2019, mesmo que para isso seja necessário realizar processo de valoração da água (GE-TACHEW; CHUN, 2017;AO et al, 2020;YAN et al, 2020).…”

Section: A Questão Hídricaunclassified

Questão Hídrica Nas Políticas Públicas

El-Deir¹,

Silva²

2023

Ver. Dir: Dir Amb. e Desev. Suntent.

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As políticas públicas devem ser relevantes para a elaboração e posterior execução das ações das governanças e das demais entidades, no propósito de mitigar os impactos ambientais, dos quais as atividades humanas são preponderantes. Neste sentido, o Tribunal de Justiça de Pernambuco vem assumindo iniciativas sustentáveis através do Plano de Logística Sustentável da instituição. Desta forma, o presente artigo visa analisar as políticas públicas no trato da questão hídrica, dando destaque particular ao Plano de Logística Sustentável do Tribunal de Justiça do Estado de Pernambuco, buscando compreender a relação com os mecanismos legais para aumento da eficiência e eficácia hídrica. A metodologia focou no levantamento documental de âmbito internacional, nacional e estadual, concernente a Acordos, Leis, Decretos e Normas, por meio de leitura crítica. Os Acordos Internacionais liderados pela ONU tornaram-se importantes fomentadores de políticas públicas, no enfrentamento dos fenômenos e fatores que contribuem para a ocorrência da escassez hídrica no mundo. As Leis nacionais e os demais instrumentos infralegais seguiram estes encaminhamentos, buscando adequarem-se à tendência mundial para promover a sustentabilidade hídrica. Já o Tribunal de Justiça de Pernambuco, por meio do Plano de Logística Sustentável, pode ser considerado um caso de benchmarking setorial, mesmo que as iniciativas ainda necessitem de maior aprofundamento nos campos ambiental, social e de governança.

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Valorization of sewage sludge through catalytic sub- and supercritical water gasification

Cited by 28 publications

References 52 publications

Study on Chemical Bond Dissociation and the Removal of Oxygen-Containing Functional Groups of Low-Rank Coal during Hydrothermal Carbonization: DFT Calculations

Study on Chemical Bond Dissociation and the Removal of Oxygen-Containing Functional Groups of Low-Rank Coal during Hydrothermal Carbonization: DFT Calculations

An Overview of the Thermochemical Valorization of Sewage Sludge: Principles and Current Challenges

Questão Hídrica Nas Políticas Públicas

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