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Towards circular economy solutions for the management of rice processing residues to bioenergy via gasification

Vaskalis, Ioannis; Skoulou, Vicky; Stavropoulos, George ; Zabaniotou, Anastasia


Ioannis Vaskalis

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

George Stavropoulos

Anastasia Zabaniotou



An economic assessment of two circular economy scenarios of fluidized bed gasification-based systems for combined heat and power (CHP) generation, fueled with rice processing wastes, was conducted. In the first scenario, the gasification plant with a capacity of 42,700 t/y of rice husks provides a waste management solution for 5 small rice processing companies, located at the same are, while in the second scenario the gasification unit of 18,300 t/y capacity provides a waste management solution to only one rice processing plant, being a custom-made solution. The first scenario is the most economically viable, with an annual revenue of 168 €/(t*y), very good payout time (POT=1.05) and return in investment (ROI=0.72). The economic assessment was based on experiments performed at a laboratory-scale gasification rig, while the economic analysis was based on the SMARt-CHP technology, developed at Aristotle University, Greece. The experimental proof of concept of rice husks waste gasification was studied at a temperature range 700-900oC, under an under-stoichiometric ratio of O2/N¬¬2 (10/90 v/v), as gasification agent. Producer gas’s LHV maximized at 800oC (10.9 MJ/Nm3), while the char’s BET surface reached a max of 146 m2/g at 900oC. Recommendations were also provided for a potential pretreatment of rice husks in order to minimize de-fluidization problems of the gasification system.


Vaskalis, I., Skoulou, V., Stavropoulos, G., & Zabaniotou, A. (2019). Towards circular economy solutions for the management of rice processing residues to bioenergy via gasification. Sustainability, 11(22), .

Journal Article Type Article
Acceptance Date Nov 12, 2019
Online Publication Date Nov 15, 2019
Publication Date 2019-11
Deposit Date Nov 16, 2019
Publicly Available Date Nov 18, 2019
Journal Sustainability
Electronic ISSN 2071-1050
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 11
Issue 22
Article Number 6433
Keywords Circular economy; Rice husks; Waste management; CHP; Gasification; Economic assessment; Ash pretreatment
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© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (

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