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Clean Use of Fuels: Future Trends and Challenges

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

Deadline for manuscript submissions: 10 November 2025 | Viewed by 2425

Special Issue Editor


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Guest Editor
Department of Chemical and Environmental Engineering, University of Seville, Camino de los Descubrimientos s/n, 41092 Seville, Spain
Interests: chemical and energy process engineering; supercritical water; adsorption; biofuels; modeling and simulation
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Special Issue Information

Dear Colleagues,

Today, with the increasing need for energy in industry, agriculture, and homes and the strict environmental actions required to achieve sustainable development on our planet, we should all embrace reflective thinking about how to move forward. Reducing, reusing, and recycling everything we can in our daily lives is part of the solution, but at the same time, we must satisfy the need for progress that characterizes us. In this way, starting with the use of clean or renewable fuels along with the available sources of fossil fuels, we must encourage ourselves to move forward in such a way that the planet can be kept safe and countries can improve the lives of their citizens. This Special Issue is addressed to all researchers working on this topic by revisiting the state of different technologies in relation to the use of clean fuels and the clean use of fuels, wherever they come from, proposing new research on a number of topics or even compiling comprehensive reviews.

Topics of interest for publication include, but are not limited to, the following:

  • The clean use of fossil fuels in transport, homes, and industry and how environmental engineering can be applied to the use of these fuels.
  • The use of clean fuels for large-scale applications in transport, homes, and industry.
  • The convergence of fuels of different provenances for sustainable development.
  • Techno-economic and life-cycle assessments of new production processes.
  • Experimental novelties regarding the valorization of waste to produce energy and chemicals.
  • The simulation of new processes involving different feedstocks involving the circular economy.
  • Optimal design methodologies to produce clean fuels or to promote the clean use of fuels.
  • Advanced modeling approaches to describe chemical and energy processes.
  • Propositions to reduce the energy demand of transport, homes, and industry while meeting production objectives.

Prof. Dr. Francisco Javier Gutiérrez Ortiz
Guest Editor

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Keywords

  • pollutant control
  • renewable fuels
  • fossil fuels
  • waste-to-energy
  • techno-economic and life cycle assessments
  • process simulation and modeling
  • fuels for sustainable transport
  • decentralized use of fuels for homes
  • production optimization
  • waste reduction and valorization

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Published Papers (3 papers)

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Research

23 pages, 812 KB  
Article
Integration of Aquaculture Wastewater Treatment and Chlorella vulgaris Cultivation as a Sustainable Method for Biofuel Production
by Marcin Zieliński, Marta Kisielewska, Annamaria Talpalaru, Paulina Rusanowska, Joanna Kazimierowicz and Marcin Dębowski
Energies 2025, 18(16), 4352; https://doi.org/10.3390/en18164352 - 15 Aug 2025
Viewed by 430
Abstract
The integration of microalgae cultivation in the treatment of aquaculture wastewater (AWW) offers a sustainable solution for the recovery of nutrients and the valorisation of biomass. In this study, the potential of Chlorella vulgaris for growth in raw AWW and its variants was [...] Read more.
The integration of microalgae cultivation in the treatment of aquaculture wastewater (AWW) offers a sustainable solution for the recovery of nutrients and the valorisation of biomass. In this study, the potential of Chlorella vulgaris for growth in raw AWW and its variants was investigated and the efficiency of nutrient removal, biochemical composition of biomass, biodiesel potential by FAME analysis, and biogas production were evaluated. C. vulgaris was cultivated in three media: raw AWW, microelement-enriched AWW, and a synthetic base medium. Raw AWW allowed for the highest biomass production (2.4 g VS/L) and nutrient removal efficiency (ammonia: 100%, phosphate: 93.7%, nitrate: 37.8%). The addition of microelements did not significantly improve growth or nutrient uptake. The biomass grown on AWW showed a favourable lipid profile for biodiesel, dominated by C16:0 and C18:1. The highest biogas and methane yields were recorded for biomass from raw AWW as 358 ± 11 L/kg VS and 216 ± 7 L/kg VS, respectively. The results confirm that AWW is a suitable medium for the cultivation of C. vulgaris, enabling efficient wastewater treatment and the production of high-quality biomass. Full article
(This article belongs to the Special Issue Clean Use of Fuels: Future Trends and Challenges)
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16 pages, 2298 KB  
Article
Combustion Characteristics of Municipal Solid Waste in a Grate-Fired Solid-Fuel Hot Water Boiler
by Dias Raybekovich Umyshev, Andrey Anatoliyevich Kibarin, Aiganym Bulatkyzy Seidaliyeva, Dilshat Ozatuly Iskakov, Yeldos Lesbekovich Zhekenov, Ilyas Kermyly Jambayev and Madina Maratovna Umysheva
Energies 2025, 18(12), 3028; https://doi.org/10.3390/en18123028 - 7 Jun 2025
Viewed by 453
Abstract
Currently, ecological energy production is one of the most pressing issues in power engineering. In addition, environmental pollution caused by various emissions and the challenge of waste disposal remain significant global concerns. One potential solution to these problems is the conversion of waste [...] Read more.
Currently, ecological energy production is one of the most pressing issues in power engineering. In addition, environmental pollution caused by various emissions and the challenge of waste disposal remain significant global concerns. One potential solution to these problems is the conversion of waste into useful energy through combustion. In this study, experimental investigations were carried out on the combustion of municipal solid waste (MSW) in a grate furnace of a 400 kW hot water boiler. The experiments included the combustion of both MSW and traditional brown coal. Data were collected on the concentrations of various substances in the exhaust gases, and thermal imaging was performed to assess heat losses from the boiler surface. When burning waste compared to coal, SO2 concentrations were significantly lower, ranging from 3.43 to 4.3 ppm, whereas for coal they reached up to 122 ppm. NOX concentrations during MSW combustion peaked at 106 ppm, while for coal combustion they reached 67.5 ppm. A notable increase in CO concentration was observed during the initial phase of coal combustion, with levels reaching up to 2510 ppm. The thermal efficiency of the boiler plant reached 84.4% when burning waste and 87% when burning brown coal. Full article
(This article belongs to the Special Issue Clean Use of Fuels: Future Trends and Challenges)
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19 pages, 1586 KB  
Article
The Effects of Straw Burning Bans on the Use of Cooking Fuels in China
by Jiafeng Gu
Energies 2024, 17(24), 6335; https://doi.org/10.3390/en17246335 - 16 Dec 2024
Cited by 1 | Viewed by 1093
Abstract
The mitigating effects of straw burning bans on air pollution are widely known; however, their effects on indoor air pollution are generally ignored. Cooking fuel use is an important factor that affects indoor air quality. However, the debate over the pros and cons [...] Read more.
The mitigating effects of straw burning bans on air pollution are widely known; however, their effects on indoor air pollution are generally ignored. Cooking fuel use is an important factor that affects indoor air quality. However, the debate over the pros and cons of a province-wide ban on straw burning has been a major issue in environmental economics. By utilizing household survey data, this study investigates the role of straw burning bans on cooking fuel use in households. To infer causal relationships, difference-in-difference models that compare households in provinces with and without a complete ban on open straw burning (COSB) are employed. The results show that COSBs promote the use of clean cooking fuels and discourage the use of firewood for cooking by households. These results hold true after a series of robustness tests, such as parallel trends and placebo tests. However, the results show that the effect of COSBs on the household use of coal as a cooking fuel is not significant. Further analysis shows heterogeneity in the effects of COSBs on the use of household cooking fuels. Thus, COSBs promote the conversion to cleaner cooking fuels in rural households, but the implementation of these policies needs to be contextualized. Full article
(This article belongs to the Special Issue Clean Use of Fuels: Future Trends and Challenges)
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