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Wastewater Treatment and Purification Technologies
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Wastewater Treatment and Purification Technologies

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Environmental Sciences".

Deadline for manuscript submissions: 31 July 2025 | Viewed by 2284

Special Issue Editors

Dr. Zhan Wei

E-Mail Website
Guest Editor
School of Environment, Harbin Institute of Technology, Harbin 150090, China
Interests: wastewater treatment technologies; envionmental intelligent management; algal-bacterial symbiotic system
Dr. Ning Li

grade E-Mail Website
Guest Editor
School of Environmental Science and Egineering, Tianjin University, Tianjin 300354, China
Interests: functional material; water treatment; adsorption; advanced oxidation; membrane filtration; catalytic process design
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is dedicated to the latest advancements in wastewater treatment and purification technologies, addressing the critical need for sustainable water management in the face of growing environmental challenges. As industries expand and populations increase, the demand for effective and efficient wastewater treatment solutions becomes ever more pressing. This issue seeks to bring together innovative research and technological developments that contribute to the removal of contaminants, recovery of resources, and the overall improvement of water quality.

We invite submissions that cover a wide range of topics, including but not limited to, advanced oxidation processes, biological treatment methods, membrane technologies, adsorption techniques, and integrated treatment systems. Studies focusing on the development of novel materials, optimization of treatment processes, and the application of nanotechnology in wastewater

Dr. Zhan Wei
Dr. Ning Li
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 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. Applied Sciences 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 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

  • wastewater treatment
  • resources recovery
  • carbon reduction
  • machine learning
  • emerging contaminants

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Published Papers (3 papers)

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Research

16 pages, 1835 KiB  
Article
Optimization of Greenhouse Gas Accounting Methods for Wastewater Treatment Plants in East Chinese Regions: A Comparative Analysis of IPCC and Group Standards Based on 49 Plants in Shandong Province
by Haoyu Wang, Lipin Li, Zhengda Lin, Aliya Abulimiti, Ming Guan, Tianrui Zhao and Yu Tian
Appl. Sci. 2025, 15(11), 6175; https://doi.org/10.3390/app15116175 - 30 May 2025
Viewed by 274
Abstract
In order to achieve China’s carbon neutrality target by 2060, accurate carbon accounting for wastewater treatment plants (WWTPs) is imperative. This study takes Shandong Province as the research object, through large-scale empirical analysis, research method differences, and the annual operation data of 49 [...] Read more.
In order to achieve China’s carbon neutrality target by 2060, accurate carbon accounting for wastewater treatment plants (WWTPs) is imperative. This study takes Shandong Province as the research object, through large-scale empirical analysis, research method differences, and the annual operation data of 49 sewage treatment plants, for the first time to realize the systematic comparison of multiple methods on the provincial scale. The main findings show a 19.7% reduction in calculated emissions from Standard for Carbon Emission Reduction Assessment of Urban WWTPs (T/CUWA 50055-2023, GS 2023) compared to Intergovernmental Panel on Climate Change (IPCC 2019), thanks to its inclusion of CO2 from fossil sources (5.0% of total emissions) and optimized CH4/N2O emission factors. Indirect emissions accounted for 56.8% of total emissions, with electricity consumption (43.3%) and chemical use (13.5%) being the main contributors. Carbon sources (27.6%) and phosphorus removal agents (15.2%) were the most important chemical-related emissions. The scale effect of indirect emissions is significant. It was found that there was a large difference in emission factors (such as a 236.9% difference in carbon source factors), and optimization strategies were proposed: preferentially using low-emission carbon sources (methanol reduced emissions by 77.6% compared with sodium acetate) and developing alternative carbon sources. Full article
(This article belongs to the Special Issue Wastewater Treatment and Purification Technologies)
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16 pages, 3003 KiB  
Article
Removal of COD from Secondary Effluent Using Fenton Iron Sludge-Based Biochar/Fe(VI)/H2O2 Process
by Lia Wang, Xu He, Lan Liang, Yanshan Wang, Beibei Yan, Guanyi Chen, Ning Li and Li’an Hou
Appl. Sci. 2025, 15(11), 5945; https://doi.org/10.3390/app15115945 - 25 May 2025
Viewed by 334
Abstract
The conventional Fenton process generates large amounts of Fenton sludge during wastewater treatment. Achieving effective utilization of Fenton sludge and reducing its production remain pivotal challenges. In this study, Fenton sludge biochar catalysts (Cat) were prepared using Fenton sludge via pyrolysis. In addition, [...] Read more.
The conventional Fenton process generates large amounts of Fenton sludge during wastewater treatment. Achieving effective utilization of Fenton sludge and reducing its production remain pivotal challenges. In this study, Fenton sludge biochar catalysts (Cat) were prepared using Fenton sludge via pyrolysis. In addition, chemical oxygen demand (COD) from secondary effluent was removed by Fenton sludge biochar catalysts activated with H2O2/Fe(VI). Specifically, the removal efficiency of COD could reach 46.2% in the Cat−2/H2O2/Fe(VI) system under weakly alkaline conditions. The mechanistic analysis confirmed that high-valent iron, •OH, O2•−, and 1O2 all participate in the degradation process. Furthermore, a continuous-flow reactor was applied to treat secondary effluent, with COD decreasing from 65 mg/L to 36 mg/L. This study provides new insights into the resource utilization of Fenton sludge and the treatment of complex wastewater. Full article
(This article belongs to the Special Issue Wastewater Treatment and Purification Technologies)
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20 pages, 10311 KiB  
Article
Effectiveness and Mechanisms of CdS/Porous g-C3N4 Heterostructures for Adsorption and Photocatalytic Degradation of Tetracycline Hydrochloride Wastewater in Visible Light
by Ran Yan, Yuqing Mao, Meirong Zhu, Chuandong Wu, Wei Zuo, Weichen Zhu, Chenxin Zhao, Yu Tian, Jun Zhang and Jie Qiu
Appl. Sci. 2024, 14(23), 11372; https://doi.org/10.3390/app142311372 - 6 Dec 2024
Viewed by 1247
Abstract
In this study, CdS/porous g-C3N4 heterostructures were successfully synthesized via in situ co-precipitation to efficiently degrade tetracycline hydrochloride (TCH) under visible light. The heterostructures, particularly at a 2:1 mass ratio of CdS to porous g-C3N4, demonstrated [...] Read more.
In this study, CdS/porous g-C3N4 heterostructures were successfully synthesized via in situ co-precipitation to efficiently degrade tetracycline hydrochloride (TCH) under visible light. The heterostructures, particularly at a 2:1 mass ratio of CdS to porous g-C3N4, demonstrated significant improvements in both adsorption and photocatalytic performance. The adsorption and degradation rates increased 4-fold and 9.64-fold, respectively, compared to pure porous g-C3N4, with optimal removal rates achieved at a catalyst dosage of 0.2 g/L. Detailed mechanistic studies revealed that photogenerated holes (h+) and superoxide radicals (·O2−) were the primary active species driving the degradation process, while hydroxyl radicals (·OH) played a minimal role. The composite material also maintained over 70% degradation efficiency after five cycles, indicating excellent stability. This research presents a promising route for the photocatalytic treatment of wastewater containing persistent organic pollutants, offering practical insights into dosage optimization, reaction kinetics, and mechanistic pathways that enhance performance. Full article
(This article belongs to the Special Issue Wastewater Treatment and Purification Technologies)
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