Advanced Wastewater Treatment and Resource Recovery: Pathways to Circular Valorization

A special issue of Recycling (ISSN 2313-4321).

Deadline for manuscript submissions: 30 June 2026 | Viewed by 1645

Special Issue Editors


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Guest Editor
Instituto Tecnológico Superior de Guanajuato (ITESG), Tecnológico Nacional de México, Carretera Estatal Guanajuato–Puentecillas km 10.5, Guanajuato 36262, Mexico
Interests: EAOPs; electrocoagulation; circular economy and resource recovery; environmental remediation
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Instituto Tecnológico Superior de Guanajuato, Tecnológico Nacional de México, Carretera Estatal Guanajuato-Puentecillas Km. 10.5, Guanajuato 36262, Mexico
Interests: electrochemical advanced oxidation processes; photocatalysis; environmental remediation; green hydrogen

Special Issue Information

Dear Colleagues,

This Special Issue aims to highlight recent advances in wastewater treatment technologies and the recovery of valuable resources within a circular economy framework. The focus is on innovative strategies that integrate contaminant removal with resource valorization, promoting sustainable reuse of water, nutrients, energy, and materials. The scope includes but is not limited to electrochemical, biological, physicochemical, and hybrid processes that enable both efficient treatment and circular recovery pathways. The purpose of this Special Issue is to provide a platform for multidisciplinary contributions that bridge laboratory research, pilot-scale studies, and practical applications, offering readers a comprehensive overview of the state of the art.

This Special Issue will complement the existing literature by emphasizing the dual goals of treatment and recovery, which are often addressed separately. By integrating these aspects, the collection will contribute to advancing practical, scalable, and sustainable solutions for wastewater management and valorization.

Prof. Dr. Miguel Angel Sandoval
Dr. Martín Oscar Armando Pacheco-Álvarez
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. Recycling 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

  • wastewater treatment
  • resource recovery
  • circular economy
  • electrochemical processes
  • advanced oxidation processes
  • water reuse
  • sustainable technologies
  • valorization pathways

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Published Papers (1 paper)

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Research

16 pages, 3259 KB  
Article
Demulsification of Oily Sludge Using Ozone Micro–Nanobubbles in Aqueous Media
by Lingli Wang, Xiaoqi Hu, Tianzhi Wang, Fawei Lin, Yuehua Li, Xiangqi Meng and Manuel Fiallos
Recycling 2026, 11(2), 24; https://doi.org/10.3390/recycling11020024 - 1 Feb 2026
Viewed by 904
Abstract
Oily sludge is a complex emulsified waste consisting of water, oil, and solid particles. Conventional treatments are often inefficient, energy-intensive, and prone to causing secondary pollution. This study proposes a green demulsification technology based on ozone micro–nanobubbles (O3MNBs) by constructing an [...] Read more.
Oily sludge is a complex emulsified waste consisting of water, oil, and solid particles. Conventional treatments are often inefficient, energy-intensive, and prone to causing secondary pollution. This study proposes a green demulsification technology based on ozone micro–nanobubbles (O3MNBs) by constructing an experimental system to analyze its effects and mechanisms of action on oily sludge treatment. The O3MNBs exhibited a mean particle size of 831 nm and generated a substantial amount of hydroxyl radicals (·OH, 250.4 μmol·L−1) in situ. Compared with conventional aeration, the dissolved ozone concentration and residence time in water of O3MNBs increased by 192% and 213%, respectively. During bubble collapse, intense pressure waves and high-speed microjets were generated to disrupt sludge aggregates, promoting the dispersion of sludge particles while simultaneously stripping oil films. Thus, the oil removal rate reached 41.5%, demonstrating the high demulsification efficiency of O3MNBs. Furthermore, ozone and ·OH attacked alkane C-H bonds in the oil phase, oxidizing hydrophobic films into hydrophilic products and decomposing surfactants that stabilize emulsions. This process promoted oil droplet coalescence and degradation into small organic molecules. After O3MNB treatment, the absorption peak of alkane C-H bonds gradually reduced, while a new C=O absorption peak appeared. This study provides a theoretical foundation and technical support for environmentally sustainable treatment of oily sludge by O3MNB application, offering an effective alternative to chemical demulsification without secondary pollution. Full article
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