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Environments
Special Issues
Advanced Technologies of Water and Wastewater Treatment, 3rd Edition
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Advanced Technologies of Water and Wastewater Treatment, 3rd Edition

A special issue of Environments (ISSN 2076-3298).

Deadline for manuscript submissions: 20 June 2026 | Viewed by 2221

Special Issue Editors

Dr. Athanasia K. Tolkou

E-Mail Website
Guest Editor
Department of Chemistry, Democritus University of Thrace, Kavala, Greece
Interests: wastewater treatment; municipal, industrial and hazardous wastewater treatment technologies (coagulation/flocculation, adsorption, ozonation, membrane bioreactors); recovery of nutrients (phosphates and nitrates) from wastewater; removal of ions, heavy metals, pharmaceuticals and dyes from water and wastewater
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. George Z. Kyzas

grade E-Mail Website
Guest Editor
Department of Chemistry, Democritus University of Thrace, Kavala, Greece
Interests: synthesis of adsorbent materials; removal of pollutants from aqueous wastewaters; activated carbons; characterization of materials; adsorption and transportation phenomena
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With more than two billion people worldwide suffering from water scarcity, clean water is one of the most important natural resources on Earth. Wastewater, or spent water, can be therefore considered a valuable natural resource if treated and reused. This Special Issue aims to address the current pressing problems of natural water resource contamination, as well as the treatment and reuse of wastewater. We welcome the submission of papers that investigate innovative treatment options for all aquatic environments.

Topics may include, but are not limited to, water and wastewater treatment technologies that can address contaminants of emerging concern for the aquatic environment, such as membrane filtration, adsorption, coagulation, ion exchange, biological processes, ozonation and advanced oxidation, or hybrid processes. Moreover, papers are welcome that deal with the fate and removal of microplastics, heavy metals, pharmaceuticals, oxyanions, toxic dyes, and several other environmental pollutants of global concern.

This Special Issue seeks to collect original research and critical reviews of scientific and technical information. Case studies describing real-life applications of novel technologies are also very welcome.

The publications in the first volume and second volume, which we believe may be of interest to you, can be found here: https://www.mdpi.com/journal/environments/special_issues/9YJ9178BY6. https://www.mdpi.com/journal/environments/special_issues/545C3RM843

Dr. Athanasia Tolkou
Prof. Dr. George Z. Kyzas
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. Environments 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 1800 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

  • membrane filtration
  • adsorption
  • coagulation
  • ozonation
  • hybrid processes
  • microplastics
  • heavy metals
  • pharmaceuticals
  • oxyanions
  • dyes

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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

17 pages, 1209 KB  
Article
Evaluation of Operating Parameters for Real Landfill Leachate Treatment via Electrocoagulation
by Joana Duarte, Diogo Correia, João Gomes and Eva Domingues
Environments 2026, 13(1), 58; https://doi.org/10.3390/environments13010058 - 21 Jan 2026
Viewed by 618
Abstract
Landfill leachate (LL) is a complex wastewater characterized by high concentrations of organic matter and heavy metals, posing significant challenges to conventional treatment technologies. Electrochemical methods, particularly electrocoagulation (ECG), have shown promise for LL treatment; however, issues related to operational optimization and electrode [...] Read more.
Landfill leachate (LL) is a complex wastewater characterized by high concentrations of organic matter and heavy metals, posing significant challenges to conventional treatment technologies. Electrochemical methods, particularly electrocoagulation (ECG), have shown promise for LL treatment; however, issues related to operational optimization and electrode durability remain insufficiently addressed. In this study, a novel electrocoagulation-based approach is proposed that systematically integrates process optimization with an explicit assessment of iron electrode reusability, which is an aspect that has been rarely explored in previous ECG studies on LL. Key operational parameters—current density, pH, inter-electrode distance, electrode surface area, and electrode material—were optimized to enhance treatment performance. Optimal conditions were achieved using iron electrodes at a current density of 256 A/m2, pH 8, an inter-electrode distance of 1 cm, and an effective electrode surface area of 19.5 cm2/L. Under these conditions, removal efficiencies of 100% for zinc, 94.9% for copper, and 54.5% for total organic carbon (TOC) were obtained, demonstrating effective simultaneous removal of inorganic and organic contaminants. The electrode reusability tests showed stable removal efficiencies over ten consecutive operational cycles, highlighting the potential for reduced operational costs and improved process sustainability. Additionally, the treated effluent exhibited reduced phytotoxicity, as evidenced by lower germination inhibition (GI), reduced root growth inhibition (RGI), and enhanced removal of humic substances. Overall, the results demonstrate that the proposed ECG approach is a robust, flexible, and environmentally sustainable solution for LL treatment, with clear advantages over conventional EC systems in terms of long-term performance and resource efficiency. Full article
(This article belongs to the Special Issue Advanced Technologies of Water and Wastewater Treatment, 3rd Edition)
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17 pages, 2720 KB  
Article
The Impact of Low Temperature on the Efficiency of Coagulation/Flocculation Process in Drinking Water Treatment
by Petr Filip and Martin Pivokonsky
Environments 2026, 13(1), 40; https://doi.org/10.3390/environments13010040 - 8 Jan 2026
Viewed by 1286
Abstract
The final stage of the drinking water treatment process yields two distinct outputs: treated water and the resulting sludge. This sludge is composed of raw water impurities, coagulation and flocculation agents, and various other additives. In any volume of processed drinking water, the [...] Read more.
The final stage of the drinking water treatment process yields two distinct outputs: treated water and the resulting sludge. This sludge is composed of raw water impurities, coagulation and flocculation agents, and various other additives. In any volume of processed drinking water, the continuous production of sludge is not negligible, leading to a significant environmental impact. This is particularly concerning when aluminium-based agents are used, as these compounds are strongly implicated in potential detrimental health risks. This situation is significantly worsened when raw water temperature approaches zero, as the treatment process efficiency is greatly diminished. Drinking water treatment at low temperatures faces a culmination of adverse effects, including a lower rate of hydrolysis and a reduced floc size, both of which negatively impact sedimentation. An effective strategy for suppressing the high dosing of chemicals is the suitable choice of ratio between acidity and the basicity of the treated water. Simply maintaining the pH value that was optimised for higher temperatures is detrimental, leading to, among other issues, increased sludge accumulation. Therefore, attention should instead be concentrated on the pOH value. A simple algebraic relation is proposed for converting the optimised pH value for higher temperatures to an optimum value for more moderate or low-temperature conditions. The application of this method results in a reduction in the amount of chemical agents required and consequently a reduction in the volume of sludge produced. Full article
(This article belongs to the Special Issue Advanced Technologies of Water and Wastewater Treatment, 3rd Edition)
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