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Sustainable Waste-to-Energy Systems
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Sustainable Waste-to-Energy Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B: Energy and Environment".

Deadline for manuscript submissions: closed (23 January 2022) | Viewed by 10095

Special Issue Editors

Dr. Konstantinos Moustakas

E-Mail Website
Guest Editor
Unit of Environmental Science & Technology, School of Chemical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, Zographou Campus, 15780 Athens, Greece
Interests: environmental chemistry; sustainability; renewable energy; waste-to-energy; integrated solid waste management; circular economy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Abdul-Sattar Nizami

E-Mail Website
Guest Editor
Government College University, Lahore, Punjab 54000, Pakistan
Interests: waste biorefinery; waste-to-energy; biogas; pyrolysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Mohammad Rehan

E-Mail Website1 Website2
Guest Editor
Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah 21589, Saudi Arabia
Interests: waste-to-energy; waste biorefineries; biofuels and bioenergy; solid waste management; nanomaterials; pyrolysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Billions of tons of waste are generated annually worldwide, causing severe damage to ecosystems and humans. Currently, a significant part of this waste ends up in landfills without any treatment. Reuse, recycling, and material recovery are the top priorities in waste management. However, energy recovery is also important and definitely more desirable a choice than landfilling. There is a huge untapped potential of recovering energy and other value-added products from waste through various technologies. Energy recovery from waste, as being a crucial part of integrated sustainable waste management systems, will not only help shift the linear economies to circular economies and secure energy supply, but also significantly mitigate the waste-related severe environmental and human health issues.

This Special Issue is designed to attract the latest developments in sustainable waste-to-energy technologies, circular economies, and the newly emerging concept of waste-based biorefineries. The editorial team welcomes original research articles, review articles, and case studies from researchers, academics, industrialists and other stakeholders, dealing with but not limited to the following research areas:

  • Advances in waste-to-energy technologies, including novel waste to energy conversion designs and methods
  • Potential of different forms of energy recovery from different waste types
  • Pre-treatments of waste and waste-to-energy system optimizations
  • Integrated sustainable waste management systems
  • Waste based biorefineries, such as organic waste biorefinery, agricultural and forestry waste biorefinery or integrated waste-based biorefineries, etc.
  • Life cycle assessment of waste-to-energy technologies and biorefineries
  • Circular economies and bio-based economies

Dr. Konstantinos Moustakas
Prof. Dr. Abdul-Sattar Nizami
Prof. Dr. Mohammad Rehan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • renewable and sustainable energy
  • waste-to-energy technologies
  • energy recovery
  • integrated sustainable waste management
  • waste valorisation
  • waste-based biorefineries
  • integrated waste-based biorefineries
  • biofuels and bioenergy
  • life cycle assessment
  • circular economy
  • bio-based economy
  • incineration
  • gasification
  • pyrolysis
  • plasma technology
  • air emissions and residues

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Published Papers (3 papers)

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Research

12 pages, 2176 KiB  
Article
Quality of Hydrochar from Wine Sludge under Variable Conditions of Hydrothermal Carbonization: The Case of Lesvos Island
by Maria A. Vasileiadou, Georgia Altiparmaki, Konstantinos Moustakas and Stergios Vakalis
Energies 2022, 15(10), 3574; https://doi.org/10.3390/en15103574 - 13 May 2022
Cited by 6 | Viewed by 1987
Abstract
Lesvos island has several food and beverage production industries and the valorization of their waste has been an unexplored task. The focus of this study is the valorization of wine sludge which is a very interesting waste stream due to the high phenolic [...] Read more.
Lesvos island has several food and beverage production industries and the valorization of their waste has been an unexplored task. The focus of this study is the valorization of wine sludge which is a very interesting waste stream due to the high phenolic content. This study identified all the operating wineries on the island and sampled local wine sludge. Hydrothermal carbonization (HTC) was utilized for the valorization of wine sludge and the production of hydrochar and liquid HTC liquor. The experiments had a residence time of 24 h and were performed at 200 °C. Except the uniqueness of wine sludge as a utilized material, this study performed HTC under different pressure regimes that were developed by different filling percentages of the reactor, i.e., 24–48%. The different pressure regimes influenced the measured parameters of both the liquid and the solid products of HTC. The Chemical Oxygen Demand (COD) ranged between 230 and 280 g/L with the maximum reduction was observed at a filling percentage of 32%. At the same time, lower filling percentages favored the total phenolic content (max value: 21 g/L) and higher filling percentages favored the Higher Heating Value (HHV) of the hydrochar (max value: 20.36 MJ/Kg) and the produced mass yield of hydrochar (max value: 234.3 mg). For all cases, low pH values were measured on the liquid fraction and this can be attributed to the presence of organic acids. Future work will focus on the characterization of the specific phenolic content of the liquid fraction. Full article
(This article belongs to the Special Issue Sustainable Waste-to-Energy Systems)
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13 pages, 1360 KiB  
Article
Determination of Kinetic and Thermodynamic Parameters of Pyrolysis of Coal and Sugarcane Bagasse Blends Pretreated by Ionic Liquid: A Step towards Optimization of Energy Systems
by Saad Saeed, Mahmood Saleem, Abdullah Durrani, Junaid Haider, Muzaffar Riaz, Sana Saeed, Muhammad Abdul Qyyum, Abdul-Sattar Nizami, Mohammad Rehan and Moonyong Lee
Energies 2021, 14(9), 2544; https://doi.org/10.3390/en14092544 - 29 Apr 2021
Cited by 8 | Viewed by 3502
Abstract
Pyrolysis behavior of ionic liquid (IL) pretreated coal and sugarcane bagasse (SCB) blends through thermogravimetric analysis (TGA) was studied. Three blends of coal and SCB having 3:1, 1:1, and 1:3 ratios by weight were treated with 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) at 150 °C for [...] Read more.
Pyrolysis behavior of ionic liquid (IL) pretreated coal and sugarcane bagasse (SCB) blends through thermogravimetric analysis (TGA) was studied. Three blends of coal and SCB having 3:1, 1:1, and 1:3 ratios by weight were treated with 1-ethyl-3-methylimidazolium chloride ([Emim][Cl]) at 150 °C for 3 h. Untreated and IL treated blends were then analyzed under pyrolytic conditions in a TGA at a constant ramp rate of 20 °C/min. Kinetic and thermodynamic parameters were evaluated using ten Coats-Redfern (CR) models to assess reaction mechanism. Results showed that the untreated blends followed a definite pattern and were proportional to the concentration of SCB in the blends. IL treated blends exhibited a higher average rate of degradation and total weight loss, indicating that IL had disrupted the cross-linking structure of coal and lignocellulosic structure of SCB. This will enhance the energy generation potential of biomass through thermochemical conversion processes. The lower activation energy (Ea) was calculated for IL treated blends, revealing facile thermal decomposition after IL treatment. Thermodynamic parameters, enthalpy change (ΔH), Gibbs free energy change (ΔG), and entropy change (ΔS), revealed that the pyrolysis reactions were endothermic. This study would help in designing optimized thermochemical conversion systems for energy generation. Full article
(This article belongs to the Special Issue Sustainable Waste-to-Energy Systems)
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26 pages, 2733 KiB  
Article
Anti-Thermal Shock Binding of Liquid-State Food Waste to Non-Wood Pellets
by Bruno Rafael de Almeida Moreira, Ronaldo da Silva Viana, Victor Hugo Cruz, Paulo Renato Matos Lopes, Celso Tadao Miasaki, Anderson Chagas Magalhães, Paulo Alexandre Monteiro de Figueiredo, Lucas Aparecido Manzani Lisboa, Sérgio Bispo Ramos, André May and José Claudio Caraschi
Energies 2020, 13(12), 3280; https://doi.org/10.3390/en13123280 - 25 Jun 2020
Cited by 2 | Viewed by 3443
Abstract
The development and implementation of strategies to assist safe and effective transport and storage of pellets in containers and indoor facilities without heating systems are challenging. This study primarily aimed to reshape the organic fraction of municipal solid waste into a liquid-state binder [...] Read more.
The development and implementation of strategies to assist safe and effective transport and storage of pellets in containers and indoor facilities without heating systems are challenging. This study primarily aimed to reshape the organic fraction of municipal solid waste into a liquid-state binder in order to develop freezing–defrosting-proof non-wood pellets. The introduction of the standard solution of food waste into the process of pelleting consisted of stirring it together with the residual biomass from distillation of cellulosic bioethanol or alternatively spraying very fine droplets on the layer of the starting material before it entered the pilot-scale automatic machine at 200 MPa and 125 °C. The addition by spraying of carbohydrate-rich supplement boiled for five minutes caused the pellets to show increases in apparent density (1250.8500 kg·m−3), durability (99.7665%), and hydrophobicity (93.9785%), and consistently prevented them from suffering severe mechanical fracture by thermal shock. The fractal dimension of breakpoints, cracks, and delamination on the finished surface for these products was the smallest at 1.7500–1.7505. Sprayed pellets would fall into the strictest grid of products for residential heat-and-power units, even after freezing and defrosting. The conclusion is therefore that spraying can spectacularly ensure the reliability of liquid-state food waste as an anti-thermal shock binder for non-wood pellets. Full article
(This article belongs to the Special Issue Sustainable Waste-to-Energy Systems)
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