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The Environmental Fate and Transport of Organic Pollutants
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The Environmental Fate and Transport of Organic Pollutants

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Quality and Contamination".

Deadline for manuscript submissions: closed (20 April 2025) | Viewed by 1301

Special Issue Editor

Dr. Jing Chen

E-Mail Website
Guest Editor
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Interests: organic pollutants; reaction mechanisms; theoretical calculation; phenolic pollu-tants; chlorinated pollutants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic pollutants are widely present in the environment, posing significant threats to human health and ecosystems. Trace organic pollutants in urban wastewater are difficult to completely remove through conventional biochemical treatment processes and will inevitably enter receiving water bodies, thereby threatening water quality. Therefore, it is crucial to conduct advanced treatment of biochemically treated effluents, such as using advanced oxidation processes to remove trace organic compounds from the effluents, and investigate the transformation behavior and toxicity risks of these pollutants in water. However, the transformation mechanisms, kinetics, and influencing factors of trace organic pollutants in biochemically treated effluents remain insufficiently understood.

This Special Issue aims to provide a comprehensive overview of the current state of knowledge in our field, highlighting research gaps and paving the way for innovative solutions. It is not only an opportunity for us to contribute to the scientific community but also a platform to showcase our collective dedication to pushing the boundaries of understanding in this vital area of study.

Dr. Jing Chen
Guest Editor

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. 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

  • organic pollutants
  • products
  • transformation mechanisms
  • kinetics
  • toxicity evaluation

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Published Papers (2 papers)

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Research

13 pages, 1613 KiB  
Article
Efficient Degradation of Bisphenol S by Ultraviolet/Persulfate Oxidation in Ultra-Pure and Saline Waters: Effects of Operating Conditions and Reaction Mechanism
by Guoqiang Liu, Kai Wu, Cunliang Zhang, Kai You, Yuefei Ji, Junhe Lu, Jing Chen and Deyang Kong
Water 2025, 17(6), 806; https://doi.org/10.3390/w17060806 - 11 Mar 2025
Viewed by 432
Abstract
As an alternative to bisphenol A, bisphenol S (BPS) is considered an emerging concern. In this study, the degradation of BPS by persulfate (PS), ultraviolet (UV), and UV/PS was comprehensively examined in ultra-pure and saline waters. UV/PS effectively degraded BPS, and the observed [...] Read more.
As an alternative to bisphenol A, bisphenol S (BPS) is considered an emerging concern. In this study, the degradation of BPS by persulfate (PS), ultraviolet (UV), and UV/PS was comprehensively examined in ultra-pure and saline waters. UV/PS effectively degraded BPS, and the observed first-order rate constant, kobs, increased from 0.021 to 0.382 min−1 with an increasing PS concentration from 100 to 1000 μΜ. The addition of humic acid (HA) inhibited the degradation of BPS, and 1/kobs was directly proportional to the concentration of HA. In salty water containing 540 mM Cl− or 0.8 mM Br−, UV/PS possessed a higher degradation ability for BPS: the corresponding kobs values were 1.45 and 1.66 times that of the control sample, respectively. Eighteen degradation products, including β-scission, sulfate addition, quinone type, ring-opening, and cross-coupling, were identified using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Two possible pathways were proposed: (i) the initial step was considered to be an electron transfer reaction from BPS to SO4•−, leading to the formation of a phenyl radical cation R1, and then phenol radical R4, 4-hydroxybenzenesulfonate cation R5, phenoxyl radical R3, resonant-type carbon-centered radical R2, and their secondary products; (ii) another pathway was the sulfate addition and hydroxylation. These primary reaction sites were further verified by theoretical calculation. This study highlights the effectiveness of UV/PS as a promising strategy for the remediation of BPS and other endocrine-disrupting chemicals in ultra-pure and saline waters (540 mM NaCl or/and 0.8 mM NaBr). Full article
(This article belongs to the Special Issue The Environmental Fate and Transport of Organic Pollutants)
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16 pages, 2511 KiB  
Article
Impacts of N2O Oversaturated Sewage Effluents on the Spatial Distribution of Riverine N2O: Insights from Sanya Estuaries, Hainan Province
by Dajun Qin, Jing Geng, Bingnan Ren and Bo Yang
Water 2024, 16(24), 3685; https://doi.org/10.3390/w16243685 - 20 Dec 2024
Viewed by 646
Abstract
Rivers and estuaries are recognized as significant sources of atmospheric greenhouse gas nitrous oxide (N2O), primarily through diffusive pathways. Anthropogenic nitrogen contributions to surface water bodies can alter the baseline emissions from natural sources; however, due to high spatial variability and [...] Read more.
Rivers and estuaries are recognized as significant sources of atmospheric greenhouse gas nitrous oxide (N2O), primarily through diffusive pathways. Anthropogenic nitrogen contributions to surface water bodies can alter the baseline emissions from natural sources; however, due to high spatial variability and limited datasets, the specific sources and sinks contributing to N2O remain poorly understood. This study investigates the sources and sinks of nitrous oxide (N2O) in river systems located in Sanya, Hainan Province, China. In April 2023, we collected 48 samples of river water and seawater, measuring hydrochemical parameters in situ while analyzing N2O concentrations in the laboratory. The results indicate that N2O concentrations vary significantly across different river systems within Sanya. Specifically, N2O concentrations ranged from 0.33 to 307.18 nmol/L for samples from the Sanya River, 2.28 to 3113.46 nmol/L for samples from Damaoshui River, 5.72 to 122.75 nmol/L for Tengqiao River waters, and between 11.08 and 18.07 nmol/L for Ningyuan River waters; coastal seawater exhibited concentrations ranging from 2.42 to 21.96 nmol/L. Notably, we observed that riverine N2O levels near sewage discharge points were oversaturated—indicating a peak concentration—which subsequently declined towards levels more consistent with those found in natural river systems as one approaches the mouths of estuaries. Both Sanya River and Damaoshui River appear to be significant sources of N2O; conversely, coastal seawater is not considered a substantial source. Our data suggest that wastewater discharges may play a critical role in influencing N2O levels within river waters by directly introducing oversaturated effluents into these ecosystems. Full article
(This article belongs to the Special Issue The Environmental Fate and Transport of Organic Pollutants)
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