Special Issue "Metal Recovery from the Secondary Resources"

A special issue of Resources (ISSN 2079-9276).

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 6629

Special Issue Editors

Prof. Dr. Eveliina Repo
E-Mail Website
Guest Editor
Department of Separation Science, LUT School of Engineering Science, LUT University, Lappeenranta, Finland
Interests: metal recycling; hydrometallurgy; ion exchange; adsorption; metal–organic framework structures; 3D printing; electrochemistry; battery materials; photocatalysis; electrocatalysis; water purification; sludge treatment
Special Issues, Collections and Topics in MDPI journals
Dr. Deepika Ramasamy
E-Mail Website
Guest Editor
Unit - Separation and Conversion Technology SCT, VITO NV, Boeretang 200, 2400 Mol, Belgium
Interests: rare-earth elements; ion exchange; electrodeionization

Special Issue Information

Dear Colleagues,

The mining of metals causes drastic environmental pollution and irreversible changes in our surroundings. Still, our society and technological development are dependent not only on basic metals, but also precious metals and rare-earth elements. The only way to decrease mining activities and their environmental impacts is to enhance metal recycling and develop sustainable and inexpensive technologies for the recovery of so-called critical metals from secondary resources, including ashes, slags, mine tailing, electronic waste, wastewaters, and various other industrial side streams. The aim of this Special Issue is to introduce novel advanced methods for metal recovery from secondary resources.

Assoc. Prof. Dr. Eveliina Repo
Dr. Deepika Ramasamy
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. Resources is an international peer-reviewed open access monthly 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 1600 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

  • metal recovery
  • secondary resources
  • hydrometallurgy
  • electrochemistry
  • ionic liquids

Published Papers (3 papers)

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Research

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Article
Behavior of Sludge Dewaterability and Nutrient Contents after Treatment with Cellulose-Based Flocculants with Combined PTS and Catalytic Behavior of Sludge towards Tetracycline Degradation
Resources 2023, 12(2), 17; https://doi.org/10.3390/resources12020017 - 17 Jan 2023
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Abstract
Wastewater treatment plants are increasingly interested in adopting inorganic coagulants and organic flocculants in their sludge treatment process since sludge disposal costs more than half of the overall operational costs. This study synthesized poly titanium sulfate (PTS) by different molar ratios and used [...] Read more.
Wastewater treatment plants are increasingly interested in adopting inorganic coagulants and organic flocculants in their sludge treatment process since sludge disposal costs more than half of the overall operational costs. This study synthesized poly titanium sulfate (PTS) by different molar ratios and used the best one with cellulose-based flocculants for sludge conditioning. PTS synthesized with a 1:2 molar ratio showed the lowest capillary suction time (CST) of sludge and was selected for further studies with cellulose-based flocculants. As bio-based flocculants have gained popularity due to current environmental problems, cationized cellulose-based flocculants (Ce-CTA) were used in this work with or without PTS for sludge treatment. After coagulation–flocculation, dewaterability of sludge enhanced, and the Lowry and Anthrone method was used to assess proteins and polysaccharides. Next, metal content and nutrients such as total phosphorus, phosphate, and nitrate were measured by ICP-OES and IC, and we found promising results of phosphate especially at pH 3. Higher total phosphorus content was found at pH 3 and 9, and even at pH 6 after PTS or PTS+Ce-CTA treatment. In addition, PTS-treated sludge materials also showed catalytic behavior, suggesting a new research avenue for future development. Based on this study, the PTS+Ce-CTA combination is promising for sludge treatment and nutrient recovery, along with the possibility for the further valorization of the sludge materials. Full article
(This article belongs to the Special Issue Metal Recovery from the Secondary Resources)
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Article
Key Challenges and Opportunities for an Effective Supply Chain System in the Catalyst Recycling Market–A Case Study of Poland
Resources 2021, 10(2), 13; https://doi.org/10.3390/resources10020013 - 09 Feb 2021
Cited by 5 | Viewed by 2340
Abstract
Increasing public awareness about low emission and stricter standards has a significant impact on the industry. The use of catalytic converters provides one of the solutions to the problem of lowering the amount of exhaust fumes. As most catalytic converters contain a combination [...] Read more.
Increasing public awareness about low emission and stricter standards has a significant impact on the industry. The use of catalytic converters provides one of the solutions to the problem of lowering the amount of exhaust fumes. As most catalytic converters contain a combination of the three metals Pt, Pd and Rh, the manufacture of catalysts for automobiles is the largest sector of demand for and consumption of PGMs (platinum group metals). In Poland, the recycling system for catalysts is still in the development stage, but there is a significant trend of increase mainly due to EU policy on the circular economy. Due to frequent legal changes, the market is not fully transparent and the price for used catalysts can vary significantly. Therefore, apart from the recycling technology itself, it is important for the company to have a transparent method of testing the catalysts. The aim of this article was to identify the key opportunities and challenges to improving the catalyst recycling system in Poland. The organisational solutions have been analysed to show that an effective system could be implemented by creating a network between suppliers and customers with the use of good laboratory equipment and IT applications. The article defines the key opportunities and challenges such as the need to invest in an innovative laboratory and software for assessment of chemical composition and economic value of waste. A great opportunity for the development of this sector is the high demand for critical raw materials such as PGMs, which can be supported by research and development (R&D) projects. Full article
(This article belongs to the Special Issue Metal Recovery from the Secondary Resources)
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Review

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Review
Electrocoagulation Sludge Valorization—A Review
Resources 2021, 10(12), 127; https://doi.org/10.3390/resources10120127 - 14 Dec 2021
Cited by 12 | Viewed by 2695
Abstract
In the field of electrocoagulation (EC), various studies on pollutant removal and on the use of different EC technologies have already been made. An EC process generates sludge, which is considered waste, resulting in increased operational costs that come from waste disposal. Sludge [...] Read more.
In the field of electrocoagulation (EC), various studies on pollutant removal and on the use of different EC technologies have already been made. An EC process generates sludge, which is considered waste, resulting in increased operational costs that come from waste disposal. Sludge contains valuable materials, such as the nutrients or metals removed during water purification, along with metals, such as aluminum or iron, which come from the electrodes used in an EC system. Based on the principles of circular economy or based on existing legislations, reducing the production of valuable wastes, and increasing the valorization rate of as many materials as possible are important endeavors. This study is mainly a review of the existing sludge valorization studies. This review highlights the valorization of sludge as a fertilizer (mainly as struvite), pigment, construction material (mainly as blocks), adsorbent, and catalyst. While it has already been found that EC sludge is valorizable, more studies on EC sludge valorization and on the quality of sludge produced from the effluent of EC processes are warranted. Full article
(This article belongs to the Special Issue Metal Recovery from the Secondary Resources)
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