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Water
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New Technologies Towards the Degradation of Emerging Contaminants in Water
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New Technologies Towards the Degradation of Emerging Contaminants in Water

A Special Issue of Water (ISSN 2073-4441) belonging to the section "Water Quality and Contamination".

Deadline for manuscript submissions: 25 November 2026 | Viewed by 842

Editors

Dr. Pengwei Yan

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Guest Editor
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Interests: catalytic ozonation; biochar; drinking water treatment; disinfection; water reuse
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jingqing Gao

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Guest Editor
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Interests: emerging contaminants; constructed wetland; aquatic ecology; advanced oxidation process
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jimin Shen

E-Mail Website
Guest Editor
School of Environment, Harbin Institute of Technology, Harbin, China
Interests: water reuse; advanced oxidation process; disinfection; emerging contaminant detection
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Urban water circulation reuse is a key approach to solving the problem of urban water shortage and improving water resource utilization efficiency, and it plays an irreplaceable role in ensuring urban water security and promoting ecological civilization construction. At present, the emerging pollutants in the urban water circulation process pose potential threats to the safety of the aquatic ecological environment. Therefore, focusing on the entire link of urban water circulation, developing new water treatment technologies to enhance the removal of new pollutants has become the core focus for improving the safety of the aquatic ecosystem. Advanced oxidation treatment units, the research and development of high-efficiency water treatment materials, and micro/nano-bubble-enhanced treatment processes, as important components of the technologies, can specifically improve water quality and provide technical support for urban water resource circulation reuse.

Dr. Pengwei Yan
Prof. Dr. Jingqing Gao
Prof. Dr. Jimin Shen
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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water 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 2600 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

  • advanced oxidation process
  • water reuse
  • emerging contaminants
  • wetland
  • functional materials

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Published Papers (2 papers)

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Research

16 pages, 2210 KB  
Article
Durable Composite Alginate Hydrogels for the Remediation of High-Concentration Cr(VI) in Industrial Effluents
by Autchariya Boontanom, Piyada Suwanpinij, Ivano Alessandri and Irene Vassalini
Water 2026, 18(17), 2078; https://doi.org/10.3390/w18172078 - 24 Aug 2026
Viewed by 215
Abstract
The transition of adsorbent materials from laboratory synthesis to industrial application requires a rigorous assessment of their durability under high concentrations. This study evaluates composite alginate hydrogels incorporating mill scale-derived magnetite (Fe3O4), activated carbon, and L-ascorbic acid (Fe3 [...] Read more.
The transition of adsorbent materials from laboratory synthesis to industrial application requires a rigorous assessment of their durability under high concentrations. This study evaluates composite alginate hydrogels incorporating mill scale-derived magnetite (Fe3O4), activated carbon, and L-ascorbic acid (Fe3O4/AC/VitC alginate hydrogels) for the detoxification of highly concentrated chromium effluents. We investigated the operational limits of these hydrogel bubbles through three distinct scenarios: (1) Single-Batch Adsorption–Regeneration Cycling in Fresh Cr(VI) Solutions, (2) Sequential Reuse of Single-Batch Hydrogel Bubbles in the Same Effluent for Complete Cr(VI) Removal, and (3) the Multi-Batch Treatment Capacity Test for highly concentrated Cr(VI) loads. The composite demonstrated exceptional robustness, maintaining >80% removal efficiency over five cycles for 100 mg/L Cr(VI) without chemical treatment. For higher loads (150–400 mg/L), a simple regeneration protocol effectively restored performance, reducing Cr(VI) levels to below stringent discharge limits (<0.25 mg/L). Furthermore, in “worst-case” scenarios involving synthetic solutions (2500 mg/L) and real electroplating wastewater (~2000 mg/L), a multi-batch approach achieved complete abatement within 8–9 cycles. Notably, the treatment simultaneously neutralized the effluent pH from ~1.0 to 7.0, confirming the potential of this waste-derived material as a resilient, multi-functional solution for complex industrial wastewater management. Beyond performance, a techno-economic analysis was conducted to evaluate the economic feasibility of industrial-scale production. The results indicate that by utilizing industrial-grade reagents and waste-derived precursors, the production cost of the dry adsorbent can be estimated at ~45 EUR/kg. These findings confirm the potential of this material as a cost-effective, multi-functional solution for SMEs struggling with high operational costs and stringent environmental regulations. Full article
(This article belongs to the Special Issue New Technologies Towards the Degradation of Emerging Contaminants in Water)
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20 pages, 6171 KB  
Article
From Olive Mill Solid Waste to Engineered Biochar: An Effective Processing Approach to Trihalomethane Removal from Water
by Sara P. Azerrad, Shilat Parsha, Hassan Azaizeh, Nariman Mattar-Dabit, Manal Haj Zaroubi and Eyal Kurzbaum
Water 2026, 18(13), 1554; https://doi.org/10.3390/w18131554 - 25 Jun 2026
Viewed by 381
Abstract
Trihalomethanes (THMs) are priority disinfection by-products in drinking water, and their effective removal remains a persistent challenge for sustainable treatment. Here, olive mill solid waste (OMSW) was valorized into biochar (BC) and evaluated as a low-cost adsorbent for chloroform, bromodichloromethane (BDCM), chlorodibromomethane (CDBM), [...] Read more.
Trihalomethanes (THMs) are priority disinfection by-products in drinking water, and their effective removal remains a persistent challenge for sustainable treatment. Here, olive mill solid waste (OMSW) was valorized into biochar (BC) and evaluated as a low-cost adsorbent for chloroform, bromodichloromethane (BDCM), chlorodibromomethane (CDBM), and bromoform under environmentally relevant conditions. Among the prepared materials, thermally activated BC (BC-T) performed best, achieving equilibrium removals of 74.7 ± 6.6% for chloroform, 91.1 ± 0.8% for BDCM, 87.2 ± 1.9% for CDBM, and 93.8 ± 0.3% for bromoform at 3000 mg/L. Adsorption increased with bromine substitution, following the order of bromoform > CDBM ≈ BDCM > chloroform, consistent with rising hydrophobicity. In contrast, KOH and Zn/Fe activation increased the BET surface area but did not improve THM removal, suggesting that adsorption was controlled by surface chemistry and site accessibility rather than surface area alone. Persulfate (PSF) addition reduced THM removal, indicating that oxidant activation did not compensate for the loss of adsorption capacity. Adsorption data were well described by the Freundlich isotherm and pseudo-second-order kinetics. BC-T also maintained high removal efficiency in drinking water, demonstrating its promise as a practical polishing adsorbent for THM control and as a route for high-value valorization of an abundant agricultural residue. Full article
(This article belongs to the Special Issue New Technologies Towards the Degradation of Emerging Contaminants in Water)
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