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Low-Carbon Wastewater Treatment and Resource Recovery
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Low-Carbon Wastewater Treatment and Resource Recovery

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Wastewater Treatment and Reuse".

Deadline for manuscript submissions: closed (20 April 2025) | Viewed by 8749

Special Issue Editor

Dr. Mengqi Zheng

E-Mail Website
Guest Editor
Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China
Interests: industrial wastewater treatment; algal-bacterial symbiosis system; biological denitrification; refractory organics; wastewater of low C/N ratio; nutrient recovery
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the rapid development of industry and agriculture, the amount of nutrient waste following discharged sewage, especially N and P elements, is increasing. In relative terms, with refined production, fewer and fewer organic emissions lead to low-carbon wastewater. On the other hand, historical problems with the presence of septic tanks and the combined system network have also decreased the carbon amount in the influent of wastewater treatment plants. As a result, the unbalanced nutritional ratios not only inhibit the microbial treatment, but also cause the waste of N and P resources. Furthermore, nutrients enter the aquatic environment, leading to eutrophication and disasters for aquatic life.

With this Special Issue of Water, we offer a platform for the publication of innovative original articles and reviews regarding the treatment and resource recovery for low-carbon wastewater. The scope of this Special Issue includes, but is not limited to, treatment techniques for refractory organics in low-carbon wastewater; synchronous removal of organic pollutants and nutrients; utmost removal of nutrients and resource recovery in low-carbon wastewater; and mechanisms of nutrient removal and absorption using chemical or biological technology. Decreasing the pollutants and recovering the nutrients in low-carbon wastewater will lead to a safer aquatic environment and healthier resource cycling.

Dr. Mengqi Zheng
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

  • low-carbon wastewater
  • nutrient wasting
  • unbalanced nutritional ratios
  • eutrophication
  • utmost removal
  • resource cycling

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Published Papers (2 papers)

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Research

16 pages, 6476 KiB  
Article
Investigation of the Anion Migration Mechanism in Microbial Desalination Cells: Interaction and Actual Operational Impact
by Jinyue Liang, Yong Gao, Wei Wu, Siqi Tong and Yi Wang
Water 2025, 17(4), 587; https://doi.org/10.3390/w17040587 - 18 Feb 2025
Viewed by 445
Abstract
Microbial desalination cells (MDCs) are an efficient method for the desalination of saline wastewater driven by the metabolism of bacteria via an organic oxidation mechanism. Systematic studies have been conducted to elucidate anion-dominated interactions to avoid unforeseen risks in microbial desalination cells during [...] Read more.
Microbial desalination cells (MDCs) are an efficient method for the desalination of saline wastewater driven by the metabolism of bacteria via an organic oxidation mechanism. Systematic studies have been conducted to elucidate anion-dominated interactions to avoid unforeseen risks in microbial desalination cells during the long-term treatment of complex wastewater containing various anions. Despite different anion migration interactions having less effect on MDC operation compared with cations, they are influenced by their own properties (hydrated ion radius, diffusion coefficient and equivalent conductance) and the ambient solution. This also led to the removal efficiency of different anions in MDC in the following sequence: NO3− > Cl− > SO42−. The high Gibbs hydration energy of SO42− and the hydrophobicity of the anion exchange membrane affect the transmembrane migration of SO42−. However, the high steric hindrance formed on the membrane also inhibits reverse diffusion at the end of the cycle. In addition, the anodic biotopography and community caused by the migration of different anions change, such that the number of denitrifying bacteria increases and the relative abundance of electrogenic bacteria further improves. With decreasing anodic pH, electrogenic microorganisms form a shell to protect against anodic biogenesis. In this study, MDC was used to treat actual industrial tailwater, and the salt removal efficiency stabilized at 63.2–74.1%. Full article
(This article belongs to the Special Issue Low-Carbon Wastewater Treatment and Resource Recovery)
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14 pages, 3281 KiB  
Article
Insights into the Nitrogen Removal Mechanism of Heterotrophic Nitrification and Aerobic Denitrification Bacterium Delfitia sp. B7
by Liao Ouyang, Wenxuan Zhang, Xianglan Chen, Qiang Huang, Huan Wang and Shuangfei Li
Water 2024, 16(21), 3042; https://doi.org/10.3390/w16213042 - 24 Oct 2024
Cited by 1 | Viewed by 7795
Abstract
The investigation of metabolic pathways and regulatory mechanisms in newly discovered species can offer valuable insights into the nitrogen removal function of heterotrophic nitrification–aerobic denitrification (HN-AD) bacteria. To investigate the nitrogen removal mechanism of a new genus, Delftia, we analyzed the complete [...] Read more.
The investigation of metabolic pathways and regulatory mechanisms in newly discovered species can offer valuable insights into the nitrogen removal function of heterotrophic nitrification–aerobic denitrification (HN-AD) bacteria. To investigate the nitrogen removal mechanism of a new genus, Delftia, we analyzed the complete genome, metabolic pathways, and the related genes of Delftia sp. B7. We further examined the nitrogen removal capacity of Delftia sp. B7 under various nitrogen sources and real wastewater. Our results demonstrate the presence of several genes in Delftia sp. B7, including narGHI, nasAB, nirK, nirS, nirBD, norBC, nosZ, nxrAB, gdhA, glnA, gltBD, amt, and nrt. These genes encode enzymes that facilitate ammonia assimilation, assimilatory nitrate reduction to nitrite, HN-AD, and dissimilatory nitrate reduction (DNRA) in Delftia sp. B7. Specifically, we propose an HN-AD pathway in Delftia sp. B7, NH4+-N → NH2OH → NO2−-N → NO3−-N → NO2−-N → NO → N2O → N2, which accounts for the majority of nitrogen removal. Here, the transformation of NH4+-N to NO2−-N was achieved by unknown enzymes or by another pathway. When treating municipal wastewater, Delftia sp. B7 was able to remove 45.62 ± 1.29% of TN. These findings provide a theoretical basis for utilizing microbial resources to mitigate nitrogen contamination. Full article
(This article belongs to the Special Issue Low-Carbon Wastewater Treatment and Resource Recovery)
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