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Separations
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Advanced Nitrogen Removal Process in Adsorption and Removal of Pollutants
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Advanced Nitrogen Removal Process in Adsorption and Removal of Pollutants

A special issue of Separations (ISSN 2297-8739). This special issue belongs to the section "Environmental Separations".

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 5985

Special Issue Editors

Dr. Xinyue Zhao

E-Mail Website
Guest Editor
School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Interests: wastewater treatment for nitrogen removal and constructed wetlands technology
Dr. Lixin Li

E-Mail Website
Guest Editor
School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150080, China
Interests: research focuses on the application of environmental microbiology to water or wastewater treatment; preparation of functional materials for mining solid waste; preparation and application of activated carbon; advanced catalytic oxidation technology for water treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The literature on wastewater provides substantial evidence on the harmful impact of wastewater derived from industrial and agricultural practices on human health and ecosystem safety. Addressing wastewater pollution will aid in the efficient and rational use of water resources and formulation of policies to adequately respond to water disasters across the world. Although both physicochemical technologies and biological-based denitrification are utilized to remove pollutants, the latter has emerged as a more promising method due to its higher efficiency, operational simplicity and lower maintenance cost compared to the former.

This Special Issue aims to publish research that investigates the reliability and efficiency of biotechnology in solving nitrogen or nutrient pollution in the environment, encompassing studies of the advanced nitrogen removal process in adsorption and removal of pollutants. We also encourage submissions of novel multidisciplinary research on physicochemical technologies assisting in effective pollutants removal. Treatment processes for wastewaters, biological waste treatment, pollutant sensing, monitoring, fate, and assessment are potential topics of interest.

Dr. Xinyue Zhao
Prof. Dr. Lixin 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. Separations 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 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

  • pollutant removal
  • advanced nitrogen removal
  • biological-based denitrification
  • microbial community
  • physicochemical technologies
  • pollutant monitoring

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Published Papers (3 papers)

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Research

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13 pages, 3188 KiB  
Article
Enhanced Degradation of Carbamazepine from Constructed Wetlands with a PEC System Based on an Anode of N-TiO2 Nanocrystal-Modified TiO2 Nanotubes and an Activated Carbon Photocathode
by Xiongwei Liang, Shaopeng Yu, Bo Meng, Jia Liu, Chunxue Yang, Chuanqi Shi and Junnan Ding
Separations 2024, 11(7), 216; https://doi.org/10.3390/separations11070216 - 19 Jul 2024
Viewed by 824
Abstract
We used the Vienna ab initio Simulation Package (VASP), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance (DRS) to optimize anode material for a photoelectric catalytic system. After screening how the doping of TiO2 by N and S affects its photoelectric properties, N-doped [...] Read more.
We used the Vienna ab initio Simulation Package (VASP), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance (DRS) to optimize anode material for a photoelectric catalytic system. After screening how the doping of TiO2 by N and S affects its photoelectric properties, N-doped TiO2 was selected to fabricate the photoelectron catalytic (PEC) system. TiO2 nanotubes modified by N-doped TiO2 nanocrystals and activated carbon were used as an anode and as a photocathode, respectively, to decompose carbamazepine in water samples from the constructed wetlands. The calculations showed that the N-TiO2 NCs/TNTAs-AC/PTFE system had the highest content of •OH. The highest carbamazepine removal rate under the N-TiO2 NCs/TNTAs-AC/PTFE composite presence was at pH = 8, and 69% of carbamazepine was removed within 180 min of the constructed wetland water treatment at pH = 7.8. The PEC system containing modified (with nano N-TiO2) TiO2 nanotubes as an anode and activated carbon as a photocathode can effectively decompose carbamazepine in the constructed wetlands. Full article
(This article belongs to the Special Issue Advanced Nitrogen Removal Process in Adsorption and Removal of Pollutants)
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13 pages, 2628 KiB  
Article
Effects of Rare Earth Doping on Structural and Electrocatalytic Properties of Nanostructured TiO2 Nanotubes/SnO2-Sb Electrode for Electrochemical Treatment of Industrial Wastewater
by Lisha Yang and Yanming Guo
Separations 2023, 10(11), 560; https://doi.org/10.3390/separations10110560 - 9 Nov 2023
Cited by 2 | Viewed by 1605
Abstract
The solvothermal synthesis technique was employed to successfully fabricate a series of rare earth doped SnO2-Sb electrodes on the TNTs array substrate, serving as anode material for electrocatalytic degradation of phenol. The electrode doped with rare earth elements demonstrated superior electrocatalytic [...] Read more.
The solvothermal synthesis technique was employed to successfully fabricate a series of rare earth doped SnO2-Sb electrodes on the TNTs array substrate, serving as anode material for electrocatalytic degradation of phenol. The electrode doped with rare earth elements demonstrated superior electrocatalytic activity and stability in comparison to the undoped electrode. The influence of adding rare earth elements (i.e., Gd and Nd) into the precursor solution on the structural and property of TNTs/SnO2-Sb electrodes was studied in detail. The results obtained from SEM and XRD indicated that, compared to TNTs/SnO2-Sb-Nd, TNTs/SnO2-Sb-Gd exhibited a finer grain size due to the smaller ionic radius of the Gd element. This facilitated its incorporation into the SnO2 lattice interior and inhibited grain growth, resulting in a significant decrease in particle size for exposing more active sites. The influence mechanism of rare earth doping on electrochemical activity was investigated through XPS, EPR, LSV, EIS and Hydroxyl radicals (•OH) generation tests. The results demonstrated that the enhanced electrocatalytic activity can be attributed to an increased generation of oxygen vacancies on the electrode surface, which act as active sites for enhancing the adsorption of oxygen species and promoting •OH generation. Full article
(This article belongs to the Special Issue Advanced Nitrogen Removal Process in Adsorption and Removal of Pollutants)
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Review

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18 pages, 3402 KiB  
Review
Resource and Energy Utilization of Swine Wastewater Treatment: Recent Progress and Future Directions
by Xiangwei Meng, Ming Jin, Qianzi Feng, Aiqi Sha, Shunwen Bai and Xinyue Zhao
Separations 2023, 10(12), 591; https://doi.org/10.3390/separations10120591 - 3 Dec 2023
Viewed by 3005
Abstract
Livestock and poultry farming, as a crucial component of agricultural production, poses a substantial threat to the ecological environment due to the discharge of wastewater. In recent years, researchers have proposed various resource treatment technologies for livestock and poultry breeding wastewater. However, a [...] Read more.
Livestock and poultry farming, as a crucial component of agricultural production, poses a substantial threat to the ecological environment due to the discharge of wastewater. In recent years, researchers have proposed various resource treatment technologies for livestock and poultry breeding wastewater. However, a comprehensive discussion regarding the limitations and avenues for optimizing resource utilization technologies for livestock and poultry farming wastewater treatment is notably absent in existing literature. This paper takes swine wastewater as an illustrative case and undertakes a review of the advantages, disadvantages, and optimization directions of resource treatment technologies, including physical and chemical technology, microbial metabolism, microbial electrochemistry, constructed wetlands, and microalgae-based techniques. Based on mass balance, the recovery rates of various treatment technologies are estimated, and it was found that microbial electrochemistry and constructed wetland techniques may become the mainstream for resource utilization in the future. Furthermore, this paper emphasizes that in addition to resource efficiency, the optimization of resource utilization technologies for swine wastewater should also focus on the following aspects: (1) striking a balance between environmental impact and economic benefits; (2) reducing the cost of resource and energy utilization; and (3) safeguarding environmental and ecological security. Full article
(This article belongs to the Special Issue Advanced Nitrogen Removal Process in Adsorption and Removal of Pollutants)
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