Selection of hydrothermal pre-treatment conditions of waste sludge destruction using multicriteria decision-making

Khalil, Wael Al-Shiekh; Shanableh, Abdallah; Rigby, Portia; Kokot, Serge

doi:10.1016/j.jenvman.2004.11.007

Cited by 30 publications

(2 citation statements)

References 19 publications

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“…HTC is performed in 80-95 vol% water [17][18][19][20], making it an ideal processing pathway for wet biomasses [21,22] such as sewage sludge. As well recognized in the literature, HTC not only leads to reduced volume and energy densification of the solid residue, considerably improving its dewaterability [23,24], but also significantly increases its solid fuel properties while stabilizing and disinfecting the sludge [25,26]. Interestingly, HTC of sludge enhances NO + NH 3 reactions during solid combustion, significantly reducing NOx emissions across combustion modes [27].…”

Section: Introductionmentioning

confidence: 88%

Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

et al. 2020

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Conventional activated sludge systems, still widely used to treat wastewater, produce large amounts of solid waste that is commonly landfilled or incinerated. This study addresses the potential use of Hydrothermal Carbonization (HTC) to valorize sewage sludge residues examining the properties of hydrochars depending on HTC process conditions and sewage sludge withdrawal point. With increasing HTC severity (process residence time and temperature), solid yield, total Chemical Oxygen Demand (COD) and solid pH decrease while ash content increases. Hydrochars produced from primary (thickened) and secondary (digested and dewatered) sludge show peculiar distinct properties. Hydrochars produced from thickened sludge show good fuel properties in terms of Higher Heating Value (HHV) and reduced ash content. However, relatively high volatile matter and O:C and H:C ratios result in thermal reactivity significantly higher than typical coals. Both series of carbonized secondary sludges show neutral pH, low COD, enhanced phosphorous content and low heavy metals concentration: as a whole, they show properties compatible with their use as soil amendments.

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Section: Introductionmentioning

confidence: 88%

Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

et al. 2020

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“…First, total aggregation, where a global score based is computed, methods such as MAUT -Multi-Utility Attribute Theory [25] used by Ma et al [31] and Oberschmidt et al [32] or AHPAnalytic Hierarchical Process [28] used by Van Dael et al [29], Kangas and Kangas [30], and Ma et al [31]. The second family of methods named partial aggregation (outranking) which are based on pairwise comparison, such as ELECTRE or PROMETHEE used by Oberschmidt et al [32], Al-Shiekh Khalil et al [33], Vego et al [34]. Although use of these methods is growing, future research should aim to address these issues in a more complete way to create a basis for implementing best practices in bioenergy projects.…”

Section: Multicriteria Analysis (Mca) For Bioenergy Projectsmentioning

confidence: 99%

Reverse logistics network design for a biogas plant: An approach based on MILP optimization and Analytical Hierarchical Process (AHP)

Gálvez

Rakotondranaivo

Morel

et al. 2015

Journal of Manufacturing Systems

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Incorporating linguistic, probabilistic, and possibilistic information in a risk‐based approach for ranking contaminated sites

Zhang

Achari

Pei

2010

Integr Envir Assess & Manag

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Different types of uncertain information-linguistic, probabilistic, and possibilistic-exist in site characterization. Their representation and propagation significantly influence the management of contaminated sites. In the absence of a framework with which to properly represent and integrate these quantitative and qualitative inputs together, decision makers cannot fully take advantage of the available and necessary information to identify all the plausible alternatives. A systematic methodology was developed in the present work to incorporate linguistic, probabilistic, and possibilistic information into the Preference Ranking Organization METHod for Enrichment Evaluation (PROMETHEE), a subgroup of Multi-Criteria Decision Analysis (MCDA) methods for ranking contaminated sites. The identification of criteria based on the paradigm of comparative risk assessment provides a rationale for risk-based prioritization. Uncertain linguistic, probabilistic, and possibilistic information identified in characterizing contaminated sites can be properly represented as numerical values, intervals, probability distributions, and fuzzy sets or possibility distributions, and linguistic variables according to their nature. These different kinds of representation are first transformed into a 2-tuple linguistic representation domain. The propagation of hybrid uncertainties is then carried out in the same domain. This methodology can use the original site information directly as much as possible. The case study shows that this systematic methodology provides more reasonable results.

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Selection of hydrothermal pre-treatment conditions of waste sludge destruction using multicriteria decision-making

Cited by 30 publications

References 19 publications

Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

Hydrothermal Carbonization as a Strategy for Sewage Sludge Management: Influence of Process Withdrawal Point on Hydrochar Properties

Reverse logistics network design for a biogas plant: An approach based on MILP optimization and Analytical Hierarchical Process (AHP)

Incorporating linguistic, probabilistic, and possibilistic information in a risk‐based approach for ranking contaminated sites

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