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Molecules
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Solid Waste and Fly Ash Chemical Treatment Methods
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Solid Waste and Fly Ash Chemical Treatment Methods

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Green Chemistry".

Deadline for manuscript submissions: 30 October 2024 | Viewed by 2534

Special Issue Editors

Dr. Lu Dong

E-Mail Website
Guest Editor
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Interests: solid waste; fly ash; chemical treatment; waste management; thermal treatment; heavy metal
Special Issues, Collections and Topics in MDPI journals
Dr. Xinye Wang

E-Mail Website
Guest Editor
Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China
Interests: solid waste; fly ash; chemical treatment; waste management; thermal treatment; heavy metal
Special Issues, Collections and Topics in MDPI journals
Dr. Huimin Liu

E-Mail Website
Guest Editor
School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan, China
Interests: solid waste; fly ash; chemical treatment; waste management; thermal treatment; heavy metal

Special Issue Information

Dear Colleagues,

In recent years, the ever-increasing generation of solid waste, predominantly comprising municipal and industrial waste, has emerged as a pressing environmental concern. These solid wastes often contain a significant concentration of hazardous pollutants, necessitating the adoption of thermochemical treatment methods such as combustion and pyrolysis to achieve energy recovery, resource utilization, and safe disposal. However, the thermal treatment processes are confronted with challenges related to pollution emissions and energy consumption.

Furthermore, during thermal treatment, the hazardous constituents of solid waste are transferred to the resulting solid residues, commonly known as fly ash. These fly ash residues are enriched with heavy metals, dioxins, and high concentrations of inorganic salts, often classified as hazardous waste. The efficient and cost-effective management of such hazardous waste has become a pivotal research focus and a formidable challenge in contemporary waste management practices.

This Special Issue aims to present recent advancements in research related to the safe and resourceful treatment of solid waste and fly ash through appropriate chemical treatment methods. We welcome original research papers, comprehensive review articles, and short communication letters that contribute to addressing these critical issues. 

Dr. Lu Dong
Dr. Xinye Wang
Dr. Huimin Liu
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. Molecules 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 2700 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

  • solid waste
  • fly ash
  • chemical treatment
  • waste management
  • thermal treatment
  • resource recovery
  • waste-to-energy
  • environmental chemistry

Published Papers (3 papers)

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Research

16 pages, 1518 KiB  
Article
The Development of Innovated Complex Process for Treatment of Old Flotation Tailings of Copper-Zinc Sulfide Ore
by Khussain Valiyev, Aliya Bugubaeva, Aleksandra Nechaeva, Alena Artykova, Vitaliy Melamud, Devard Stom, Anna Boduen and Aleksandr Bulaev
Molecules 2024, 29(7), 1550; https://doi.org/10.3390/molecules29071550 - 29 Mar 2024
Viewed by 518
Abstract
The possibility of selective Cu and Zn leaching from the sample of old pyrite tailings, which is one of the most widespread types of solid waste forming during non-ferrous metal production, using sulfuric acid solutions and water was studied. It was shown that [...] Read more.
The possibility of selective Cu and Zn leaching from the sample of old pyrite tailings, which is one of the most widespread types of solid waste forming during non-ferrous metal production, using sulfuric acid solutions and water was studied. It was shown that water leaching provided selective extraction of Cu and Zn and comparatively low iron ion extraction. At the same time, acid leaching provided the obtainment of pregnant solutions with high ferric ion concentration, which can be used for oxidative leaching of substandard copper concentrates. Water and acid leaching also provided increased Au recovery by cyanidation. The results suggest that acid leaching can be an effective approach for processing old flotation tailings, which allows the extraction of base metals from these wastes and treating flotation tailings for subsequent cyanidation. Effective flotation treatment methods should also provide environmental load reduction, which is caused by the long-term storage of metal-bearing wastes. Full article
(This article belongs to the Special Issue Solid Waste and Fly Ash Chemical Treatment Methods)
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13 pages, 5186 KiB  
Article
The Effect of Nitrogen Functional Groups on Pb0, PbO, and PbCl2 Adsorption over a Carbonaceous Surface
by Liang Wang, Huaizhou Wen, Lei Guo, Ancheng Liang, Tingan Liu, Dongxu Zhao and Lu Dong
Molecules 2024, 29(2), 511; https://doi.org/10.3390/molecules29020511 - 19 Jan 2024
Viewed by 731
Abstract
Lead (Pb) pollution, especially from the incineration of municipal solid waste (MSW), poses a significant threat to the environment. Among all the effective methods, activated carbon (AC) injection serves as an effective approach for lead removal from flue gas, while the modification of [...] Read more.
Lead (Pb) pollution, especially from the incineration of municipal solid waste (MSW), poses a significant threat to the environment. Among all the effective methods, activated carbon (AC) injection serves as an effective approach for lead removal from flue gas, while the modification of ACs emerges as a crucial pathway for enhancing Pb adsorption capacities. Density functional theory (DFT) is employed in this study to investigate the mechanisms underlying the enhanced adsorption of Pb species (Pb0, PbO, and PbCl2) on nitrogen-functionalized carbonaceous surfaces. The results show that nitrogen-containing groups substantially enhance lead adsorption capacity, with adsorption energies ranging from −526.18 to −288.31 kJ/mol on nitrogen-decorated carbonaceous surfaces, much higher than those on unmodified surfaces (−310.35 to −260.96 kJ/mol). Additionally, electrostatic potential and density-of-states analyses evidence that pyridinic nitrogen atoms remarkably expand charge distribution and strengthen orbital hybridization, thereby augmenting lead capture. This research elucidates the role of nitrogen-containing functional groups in lead adsorption, offering valuable insights for the development of highly efficient biomass-derived activated carbon sorbents for lead removal. Full article
(This article belongs to the Special Issue Solid Waste and Fly Ash Chemical Treatment Methods)
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14 pages, 4983 KiB  
Article
Recycling Coal Fly Ash for Super-Thermal-Insulating Aerogel Fiber Preparation with Simultaneous Al2O3 Extraction
by Jie Gu, Lipeng Liu, Rongrong Zhu, Qiqi Song, Hanqing Yu, Pengjie Jiang, Changqing Miao, Yuxiang Du, Rui Fu, Yaxiong Wang, Yan Hao and Huazheng Sai
Molecules 2023, 28(24), 7978; https://doi.org/10.3390/molecules28247978 - 06 Dec 2023
Viewed by 1007
Abstract
A large quantity of coal fly ash is generated worldwide from thermal power plants, causing a serious environmental threat owing to disposal and storage problems. In this work, for the first time, coal fly ash is converted into advanced and novel aerogel fibers [...] Read more.
A large quantity of coal fly ash is generated worldwide from thermal power plants, causing a serious environmental threat owing to disposal and storage problems. In this work, for the first time, coal fly ash is converted into advanced and novel aerogel fibers and high-purity α-Al2O3. Silica–bacterial cellulose composite aerogel fibers (CAFs) were synthesized using an in situ sol-gel process under ambient pressure drying. Due to the unique “nanoscale interpenetrating network” (IPN) structure, the CAFs showed wonderful mechanical properties with an optimum tensile strength of 5.0 MPa at an ultimate elongation of 5.8%. Furthermore, CAFs with a high porosity (91.8%) and high specific surface area (588.75 m2/g) can inherit advanced features, including excellent thermal insulation, stability over a wide temperature range, and hydrophobicity (contact angle of approximately 144°). Additionally, Al2O3 was simultaneously extracted from the coal fly ash to ensure that the coal fly ash was fully exploited. Overall, low-cost woven CAFs fabrics are suitable for wearable applications and offer a great approach to comprehensively use coal fly ash to address environmental threats. Full article
(This article belongs to the Special Issue Solid Waste and Fly Ash Chemical Treatment Methods)
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