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Processes
Special Issues
Sediment Contamination and Metal Removal from Wastewater
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Sediment Contamination and Metal Removal from Wastewater

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: 28 February 2026 | Viewed by 6593

Special Issue Editors

Dr. Yahya El Hammoudani

E-Mail Website
Guest Editor
Engineering Sciences and Applications Laboratory, National School of Applied Sciences of Al-Hoceima, Department of Energy and Environmental Civil Engineering, Université Abdelmalek Essaadi, Tetouan, Morocco
Interests: chemical engineering; environmental sciences; wastewater treatment
Prof. Dr. Khadija Haboubi

E-Mail Website
Guest Editor
Engineering Sciences and Applications Laboratory, National School of Applied Sciences of Al-Hoceima, Department of Energy and Environmental Civil Engineering, Université Abdelmalek Essaadi, Tetouan, Morocco
Interests: chemical engineering; material sciences; environmental scienes
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Fouad Dimane

E-Mail Website
Guest Editor
Engineering Sciences and Applications Laboratory, Department of Energy and Environmental Civil Engineering, National School of Applied Sciences of Al-Hoceima, Abdelmalek Essaâdi University, Tetouan, Morocco
Interests: environmental scienes; wastewater treatment; water management; biochar production; bioadsorption & waste valorization; analytical chemistry & characterization techniques
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue aims to explore the challenges and advances in the field of sediment contamination and metal removal technologies from wastewater. The contamination of sediments by heavy metals and other toxic substances poses a major environmental concern, compromising the quality of aquatic ecosystems and human health. Furthermore, the effective treatment of wastewater remains a priority to minimize the impacts of industrial, agricultural, and urban activities.

Articles submitted to this Special Issue will address topics such as

  • The transport and accumulation mechanisms of metals in sediments.
  • Advanced analytical techniques for characterizing metals and their forms in sediment matrices.
  • The environmental and ecotoxicological impacts associated with metals in sediments.
  • The development and optimization of wastewater treatment technologies for metal removal, such as adsorption, chemical precipitation, electrochemical processes, and biological treatments.
  • Innovative and sustainable approaches for the recovery and valorization of extracted metals.
  • Case studies illustrating integrated solutions for managing contaminated sediments and treating wastewater.

This Special Issue aims to bring together original research contributions, case studies, and critical reviews highlighting interdisciplinary approaches that combine chemistry, environmental engineering, ecotoxicology, and resource management. We encourage submissions offering new perspectives and innovative solutions to address these complex and interconnected challenges.

Dr. Yahya El Hammoudani
Prof. Dr. Khadija Haboubi
Prof. Dr. Fouad Dimane
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 250 words) can be sent to the Editorial Office for assessment.

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. Processes 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 2400 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

  • sediment contamination
  • heavy metal removal
  • wastewater treatment
  • environmental remediation
  • sustainable technologies

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (2 papers)

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Research

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21 pages, 4515 KB  
Article
Performance Evaluation of Hybrid and Conventional Coagulants for the Removal of Sunset Yellow and Methylene Violet Dyes from Wastewater
by Eftychia Kalli, Konstantinos N. Maroulas, Anna A. Thysiadou, George Z. Kyzas and Athanasia K. Tolkou
Processes 2025, 13(11), 3430; https://doi.org/10.3390/pr13113430 - 25 Oct 2025
Viewed by 543
Abstract
Textile industries release dyes into wastewater, and when present above certain levels, these dyes pose serious risks because of their high toxicity. This study investigates the removal of Sunset Yellow (SY) and Methylene Violet (MV) dyes from wastewater using chitosan (CS) and polysilicate [...] Read more.
Textile industries release dyes into wastewater, and when present above certain levels, these dyes pose serious risks because of their high toxicity. This study investigates the removal of Sunset Yellow (SY) and Methylene Violet (MV) dyes from wastewater using chitosan (CS) and polysilicate acid (pSi) in the structure of aluminum-based coagulants, resulting in hybrid formulations (CS@Al, Al/pSi, and CS@Al/pSi). Among the various treatment methods that have been applied for the removal of dyes, the coagulation/flocculation process was chosen in the present study, as it is a cheap and effective method. Coagulation performance was optimized for pH, coagulant dosage, temperature and mixing time. The Al/pSi coagulant achieved nearly complete SY removal (98.8%) at 25 mg/L dosage and pH 3.0. MV removal in single-dye solutions was limited, with Al/pSi achieving only 26.6% removal at pH 3.0. However, in mixed-dye systems (SY/MV), synergistic interactions increased MV removal up to 94.4% and SY removal to 100%. Hybrid CS@Al/pSi showed lower SY removal (36.4%) for SY at 50 mg/L but provided stable floc formation, particularly in mixtures of anionic and cationic dyes. Application to real textile wastewater confirmed the high efficiency of the optimized coagulants, particularly with Al/pSi20,A and AlCl3, indicating their potential for industrial wastewater treatment. SEM, EDS, XRD, and FTIR analyses revealed structural consolidation, increased surface area, and successful dye adsorption, explaining the high removal efficiency. Full article
(This article belongs to the Special Issue Sediment Contamination and Metal Removal from Wastewater)
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Review

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27 pages, 2264 KB  
Review
Sustainable Remediation: Advances in Red Mud-Based Synergistic Fabrication Techniques and Mechanistic Insights for Enhanced Heavy Metal(Loid)s Sorption in Wastewater
by Feng Li, Renjian Deng, Baolin Hou, Lingyu Peng, Bozhi Ren, Xiangxing Kong, Bo Zhang and Andrew Hursthouse
Processes 2025, 13(7), 2249; https://doi.org/10.3390/pr13072249 - 14 Jul 2025
Cited by 2 | Viewed by 1735
Abstract
Rapid growth in the alumina industry generates vast amounts of highly alkaline red mud (RM), posing significant environmental risks. However, RM shows great promise as a resource for environmental remediation, particularly through its conversion into effective adsorbents. This research reviews recent advancements in [...] Read more.
Rapid growth in the alumina industry generates vast amounts of highly alkaline red mud (RM), posing significant environmental risks. However, RM shows great promise as a resource for environmental remediation, particularly through its conversion into effective adsorbents. This research reviews recent advancements in developing RM-based adsorbents for sustainable wastewater treatment, especially targeting heavy metal(loid)s (HMs). We examine key modification mechanisms to enhance RM’s properties, summarize synthesis methods for various RM- based adsorbents, and evaluate their performance in removing HMs from water, guiding the design of subsequent new materials. Crucially, this review highlights studies on adsorbent reusability, HM leaching, and economic feasibility to address economic and safety concerns. Finally, we discuss adsorption mechanisms and prospects for these materials. Full article
(This article belongs to the Special Issue Sediment Contamination and Metal Removal from Wastewater)
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