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Removal and Recovery of Nitrogen and Phosphorus from Wastewater
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Removal and Recovery of Nitrogen and Phosphorus from Wastewater

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

Deadline for manuscript submissions: 30 July 2024 | Viewed by 2876

Special Issue Editor

Dr. Qian Ping

E-Mail Website
Guest Editor
School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
Interests: wastewater treatment; sludge treatment, removal of antibiotics and resistance gene; anaerobic fermentation; metagenomic
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nitrogen and phosphorus in wastewater are the main factors causing eutrophication of water bodies, resulting in a sharp drop in biodiversity in the water and contamination of drinking water sources all over the world. On the other hand, nitrogen and phosphorus are also important resources, of which phosphorus is a non-renewable resource. The global demand for phosphate will exceed the supply and lead to global phosphorus scarcity in the near future. Various types of wastewater treatment techniques, including enhanced biological phosphorus removal, the shortcut nitrification and denitrification process, the anammox process, chemical precipitation, electrochemical methods, adsorption, mineralization, etc., have been widely used for the removal and recovery of nitrogen and phosphorus from wastewater. However, the mechanisms and engineering applications of these techniques still need to be studied and validated. Moreover, new methods, processes and technologies for nutrient removal and recovery in biological, chemical and physical treatment of wastewater are being developed. Hence, this Special Issue is mainly focused on bringing together innovative techniques and developments in the field of wastewater treatment engineering.

Dr. Qian Ping
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. 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

  • nutrient removal
  • resource recovery
  • biological wastewater treatment
  • chemical precipitation
  • electrochemistry
  • physical treatment
  • phosphorus release and recovery

Published Papers (2 papers)

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Research

17 pages, 5371 KiB  
Article
The Phosphorus Adsorption and Recovery of Mg/Fe-LDHs Mulberry Rod Biochar Composite
by Meina Liang, Zimeng Wu, Haiyan Cao, Kun Dong, Shaoyuan Bai and Dunqiu Wang
Separations 2024, 11(3), 86; https://doi.org/10.3390/separations11030086 - 18 Mar 2024
Viewed by 844
Abstract
Mg/Fe layered bimetallic oxide mulberry rod biochar composites (MFBCs) were prepared from mulberry rods and characterized using electron microscopy scanning (SEM), X-ray diffraction (XRD), Fourier infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). We investigated the adsorption properties of MFBCs for phosphorus, which [...] Read more.
Mg/Fe layered bimetallic oxide mulberry rod biochar composites (MFBCs) were prepared from mulberry rods and characterized using electron microscopy scanning (SEM), X-ray diffraction (XRD), Fourier infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). We investigated the adsorption properties of MFBCs for phosphorus, which was recovered via crystallization using calcium chloride as a precipitant. According to the findings, the MFBC is a layered bimetallic oxide with a specific surface area of 70.93 m2·g−1. Its point of zero charge values, or pHzpc, was 7.66. The removal of phosphorus usingMFBCs gradually decreased with increasing pH, and the optimum pH for phosphorus removal was 4.0. The maximum phosphorus adsorption by MFBCs at 298 K was 29.682 mg·g−1 for MFBCs. The adsorption process of phosphorus onto MFBCs is a heat absorption process, and the adsorption isothermal data of phosphorus onto MFBCs fit with the Langmuir adsorption isothermal model. Phosphorus recovery is achieved when calcium chloride is added to the phosphate-enriched desorption solution at a Ca/P molar ratio of 2.2. The phosphorus product obtained from this process is very pure hydroxyphospapatite. The recovery rate of phosphorus in the desorption solution is 99.64%. Full article
(This article belongs to the Special Issue Removal and Recovery of Nitrogen and Phosphorus from Wastewater)
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14 pages, 1886 KiB  
Article
Anaerobic Digestion of Phosphorus-Rich Sludge and Digested Sludge: Influence of Mixing Ratio and Acetic Acid
by Zhicheng Xi, Wenhan Wang, Qian Ping, Lin Wang, Xiangkai Pu, Bin Wang and Yongmei Li
Separations 2023, 10(10), 539; https://doi.org/10.3390/separations10100539 - 12 Oct 2023
Cited by 1 | Viewed by 1588
Abstract
Phosphorus is a critical influencial factor in the anaerobic digestion of phosphorus-rich sludge (PRS). The anaerobic digestion of PRS and digested sludge (DS) mixed according to different proportions was studied. The result showed that the phosphorus release rate of the mixed sludge increased [...] Read more.
Phosphorus is a critical influencial factor in the anaerobic digestion of phosphorus-rich sludge (PRS). The anaerobic digestion of PRS and digested sludge (DS) mixed according to different proportions was studied. The result showed that the phosphorus release rate of the mixed sludge increased with the increase in DS proportion until the DS proportion was over 50%. When the mixing ratio of PRS to DS was 3:1, the specific phosphorus release rate (SPRR) was increased by 20% and the methane production was raised to 7.39 mL/g VSS. A further experiment on the concentration of the added acetic acid indicated that the phosphorus release rate also tended to rise with the increase in acetic acid until the concentration was over 500 mg COD/L. Finally, the results of the anaerobic digestion of DS and waste activated sludge (WAS) showed that there was no typical phosphorus release in the initial stage of anaerobic digestion in WAS. Full article
(This article belongs to the Special Issue Removal and Recovery of Nitrogen and Phosphorus from Wastewater)
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