Municipal sewage sludge energetic conversion as a tool for environmental sustainability: production of innovative biofuels and biochar

Trabelsi, Aïda Ben Hassen; Zaafouri, Kaouther; Friaa, Athar; Abidi, Samira; Naoui, Slim; Jamaaoui, Faycel

doi:10.1007/s11356-020-11400-z

Cited by 20 publications

(12 citation statements)

References 33 publications

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“…The parallel centre-point experiments in large scale, L.330.H2O/EtOH.675.600 (+ 0 0 0 0) provided oil yields of 51 and 54%. Even with such variations, these oil yields are higher than previously reported in literature (9.4% from DSS [5]; 34.4 wt% daf from DSS [34]; 28.0 wt% from sewage sludge [35]; 58 wt% daf from DSS [25]).…”

Section: Oil Yieldscontrasting

confidence: 63%

Exploring Hydrothermal Liquefaction (HTL) of Digested Sewage Sludge (DSS) at Laboratory Pilot Scale using Experimental Design

Hegdahl

Ghoreishi

Løhre

et al. 2023

Preprint

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A common perspective within the prospect of a green future is utilising our waste materials. One waste material of which the world has abundant resources, and where we will keep having resources, is sewage sludge. This waste material is getting an increased focus, and is commonly utilised by anaerobic digestion processes for methane production. This leaves a bioresidue of digested sewage sludge (DSS). In this study, DSS is submitted to hydrothermal liquefaction (HTL) to produce bio-oil. The studied process includes upscaling as well as considering the effects of temperature, reaction medium of water or ethanol, degree of reactor filling and stirring rate. Promising results are found as high oil yields are obtained also after upscaling. The results reported here show that stirring reduces the need of high temperatures during HTL, providing energy savings that are promising for further upscaling. In addition, a total of 18 compounds are identified and semi-quantified, showing an abundance of fatty acids and fatty acid derivatives within the oil, encouraging further studies towards separation of said fatty acids for use as biodiesel.

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Section: Oil Yieldscontrasting

confidence: 63%

Exploring Hydrothermal Liquefaction (HTL) of Digested Sewage Sludge (DSS) at Laboratory Pilot Scale using Experimental Design

Hegdahl

Ghoreishi

Løhre

et al. 2023

Preprint

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“…Trabelsi et al have performed a centred composite experimental design for pyrolysis of municipal sewage sludge. This study gave a bio-oil yield of up to 28.0 wt% ( Trabelsi et al, 2021 ).…”

Section: Introductionmentioning

confidence: 86%

“…A pragmatic approach using experimental design and optimization is a much more viable alternative. A few optimization studies on thermochemical conversion of biosolids from sewage sludge has previously been reported: HTL of SS optimization is described (Madsen andGlasius, 2019), andTrabelsi et al (2021) used a central composite design for their optimization of fast pyrolysis of SS. However, the different composition of the DSS compared to raw SS, and the inherent differences in sewage sludge composition with regard to treatment plants, technologies, seasons and other variable parameters, make optimization of each type of SS derived feedstock necessary.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal liquefaction of sewage sludge anaerobic digestate for bio-oil production: Screening the effects of temperature, residence time and KOH catalyst

2022

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Due to sewage sludge being an abundant biobased resource, and with the number of biogas plants utilizing sewage sludge increasing, digested sewage sludge (DSS) is a promising feedstock for producing bio-oil. This study uses DSS from a biogas plant to produce bio-oil in a hydrothermal liquefaction process adjusting time from 2 to 6 hours, temperature from 280 to 380°C and the presence of a base as a depolymerization agent and potential catalyst. High conversion yields are obtained, with the maximum of 58 wt% on a dry, ash free basis and an energy recovery of up to 94%. The oils contain compounds with a potential for utilization as biofuels and building blocks, especially fatty acids as biodiesel feedstock and biobased phenols, glycols and aliphatic alcohols.

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“…During pyrolysis, SSB, tar, and syngas yields are around 56%, 26%, and 18%, respectively, according to report by Trabelsi et al. (2021). A study reported by Singh et al.…”

Section: Utilization Of Ssb For Beneficial Impacts On Socioeconomic A...mentioning

confidence: 69%

“…The research of Gievers et al (2021) showed that using biochar properly and pyrolyzing digested sewage sludge can be a green alternative to both sequestering carbon and breaking the nutrient cycle. During pyrolysis, SSB, tar, and syngas yields are around 56%, 26%, and 18%, respectively, according to report by Trabelsi et al (2021). A study reported by noted the general elements of SSB that require more study, including cost optimization, cost analysis for commercial-scale production, farmer acceptance of SSBC, and comparison of adsorbent performance with commercially available options.…”

Section: Utilization Of Ssb For Beneficial Impacts On Socioeconomic A...mentioning

confidence: 99%

Production strategies and potential repercussion of sewage sludge biochar as a futuristic paradigm toward environmental beneficiation: A comprehensive review

Venkatesa Prabhu,

Hamda,

Jayakumar

et al. 2023

Environmental Quality Mgmt

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The generation of sewage wastewater is unavoidable due to the continual increase in the global population that paves the way to appropriate disposal management. Sewage wastewater treatment and consequent generation of sewage sludge (SS) are well connected with global environmental issues. Upon risk assessment on different SS disposal methods, converting SS into biochar, that is, sewage sludge biochar, can be recommendable management. It is well‐proven for excellent positive impacts, such as nutrient enhancement, and healthier plant growth, and mitigates the emissions of greenhouse gases while amending with agricultural soil. However, the outcome features of SSB significantly vary with pyrolysis temperature and its elemental constituents. In addition, many studies revealed that the process temperature is key to responsible for the desirable properties and functioning of SSB. In this context, many countries support to the development of a futuristic strategy for SS management toward producing SSB and its utilization in agriculture. This review compiles studies into SSB's ability to promote a sustainable effect on the total worldwide output volume. Furthermore, the generation of SSB is also analyzed from a socioeconomic standpoint in relation to other common SS disposal management strategies.

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Municipal sewage sludge energetic conversion as a tool for environmental sustainability: production of innovative biofuels and biochar

Cited by 20 publications

References 33 publications

Exploring Hydrothermal Liquefaction (HTL) of Digested Sewage Sludge (DSS) at Laboratory Pilot Scale using Experimental Design

Exploring Hydrothermal Liquefaction (HTL) of Digested Sewage Sludge (DSS) at Laboratory Pilot Scale using Experimental Design

Hydrothermal liquefaction of sewage sludge anaerobic digestate for bio-oil production: Screening the effects of temperature, residence time and KOH catalyst

Production strategies and potential repercussion of sewage sludge biochar as a futuristic paradigm toward environmental beneficiation: A comprehensive review

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