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Augmented Leaching Pretreatments for Forest Wood Waste and Their Effect on Ash Composition and the Lignocellulosic Network

Taylor, Martin J.; Alabdrabalameer, Hassan A.; Michopoulos, Apostolos K.; Volpe, Roberto; Skoulou, Vasiliki


Hassan A. Alabdrabalameer

Apostolos K. Michopoulos

Roberto Volpe

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Dr Vicky Skoulou
Graduate Research Director (GRD) of School of Engineering ; Senior Lecturer (Assoc. Prof.) in Chemical Engineering-Bioenergy ; PI of the B3: Biomass Waste- BioenergH2- Biochars Challenge Group of PGRs and PDRAs



© 2020 American Chemical Society. By augmenting conventional leaching technologies for the removal of ash constituents from lignocellulosic waste residues, a cleaner and energy efficient solution can be provided for critical industrial problems such as biomass feeding, defluidization, and reactor corrosion. It has been found that not only are inorganic constituents (ash) effectively removed by coupling a physicochemical technology with conventional leaching but also the intermolecular interactions within the lignocellulosic matrix can be modified, as shown by a variable crystallinity index (powder X-ray diffraction) without the loss of physical bonding (Fourier-transform infrared spectroscopy). Ultimately, this allowed for a greater thermochemical transformation of cellulose, hemicellulose, and lignin for all technologies used: conventional leaching, indirect/directed ultrasound, and microwave irradiation. However, the use of directed ultrasound was found to be the standout, energy efficient technology (8.6 kJ/g) to radically improve the thermochemical transformation of wood waste, especially in the reduction of fixed carbon at high temperatures. It was also found to be efficient at removing vital eutectic mixture causing elements, including Si, which is known to be notoriously difficult to remove via leaching. In comparison, hot plate leaching and microwave irradiation use 39 and 116 times more energy, respectively. The integration of this technology into the energy production sector will prove vital in the future due to its scalability, as compared with microwave alternatives, which are currently not suitable for large scale operations. Additionally, the residence time required for directed ultrasound was found to be negligible as compared to the various other physicochemical techniques, 0.1 h opposed to 4 h.


Taylor, M. J., Alabdrabalameer, H. A., Michopoulos, A. K., Volpe, R., & Skoulou, V. (2020). Augmented Leaching Pretreatments for Forest Wood Waste and Their Effect on Ash Composition and the Lignocellulosic Network. ACS Sustainable Chemistry and Engineering, 8(14), 5674-5682.

Journal Article Type Article
Acceptance Date Mar 24, 2020
Online Publication Date Mar 24, 2020
Publication Date Apr 13, 2020
Deposit Date Mar 25, 2020
Publicly Available Date Oct 27, 2022
Journal ACS Sustainable Chemistry and Engineering
Print ISSN 2168-0485
Electronic ISSN 2168-0485
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 8
Issue 14
Pages 5674-5682
Keywords Biomass; Solid fuels; Energy assessment; Multi-parameter analysis; Enhanced leaching processes; Waste-to-energy; Clean technology
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Copyright Statement
© 2020 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY)<br /> License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

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