Towards the Circular Economy—Membrane Processes for the Recovery of Water and Nutrients from Wastewater (2nd Edition)

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Membrane Applications for Water Treatment".

Deadline for manuscript submissions: 30 September 2025 | Viewed by 711

Special Issue Editor


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Guest Editor
Łukasiewicz Research Network, Institute for Sustainable Technologies, 26-600 Radom, Poland
Interests: wastewater treatment and closing water circuits using membrane techniques; new filtration and sorption materials; function of membrane and filtration materials; thermal methods for conversion and management of industrial waste; biotechnological methods for treatment of industrial wastewater
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Special Issue Information

Dear Colleagues,

This Special Issue is the sequel to a previous Special Issue entitled ”Towards the Circular Economy—Membrane Processes for the Recovery of Water and Nutrients from Wastewater”.

Water covers 71% of the Earth's surface. Unfortunately, only about 1% of this resource is freshwater, our source of drinking water.

To meet the needs of the world’s growing population, there should be sufficient water available. Moreover, the current generation should take responsibility for ensuring the future needs of society are met, which constitutes the basis of sustainable development. This requires taking further steps to protect water resources, as well as to recover clean water from wastewater. One of the most promising methods used for recovering water from wastewater are membrane processes. Membranes with different separation properties enable the recovery of high-quality water suitable for consumption and for use in many industries. In addition, membrane processes can be used to recover raw materials (e.g., nutrients, phosphorus), generating a circular economy (CE). Compared to conventional water treatment methods, membrane techniques allow for the production of water of a consistent quality; do not require the use of additional chemicals; and also enable energy savings, continuous separation, and the enlargement of the technological scale of modular systems. The widespread interest in the use of membrane techniques for wastewater treatment has led to the development of methods and materials that can create membranes with improved functional properties, enabling fouling control. When designing modern technological solutions, it is also necessary to manage wastes, including used membranes and the concentrates of filtered liquid components. Thus, circular management and the disposal of waste are strongly recommended in this area.

This Special Issue aims to provide an overview of the latest advances in the strategies of action for sustainable development within the field of membrane solutions, such as saving water resources and minimizing the release of industrial pollutant emissions into the natural environment.

Potential topics in this area include, but are not limited to, the following:

  • Circular economy;
  • Water reclamation;
  • Nutrient recovery;
  • Wastewater treatment;
  • Membrane processes;
  • New types of membranes;
  • Membrane manufacturing;
  • Membrane fouling control.

Dr. Anna Kowalik-Klimczak
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. Membranes 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 2200 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

  • circular economy
  • membrane processes
  • water
  • nutrients
  • wastewater

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Published Papers (1 paper)

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Research

15 pages, 2632 KiB  
Article
Treatment of Dairy Wastewater Retentate After Microfiltration: Evaluation of the Performance of the System Based on Activated Sludge and Activated Carbon
by Maciej Życki, Wioletta Barszcz and Monika Łożyńska
Membranes 2025, 15(8), 237; https://doi.org/10.3390/membranes15080237 - 6 Aug 2025
Viewed by 532
Abstract
The dairy industry generates significant amounts of wastewater, including microfiltration (MF) retentate, a byproduct thickened with organic and inorganic pollutants. This study focuses on the treatment of two times concentrated MF retentate using a hybrid system based on biological treatment in a sequential [...] Read more.
The dairy industry generates significant amounts of wastewater, including microfiltration (MF) retentate, a byproduct thickened with organic and inorganic pollutants. This study focuses on the treatment of two times concentrated MF retentate using a hybrid system based on biological treatment in a sequential batch reactor (SBR) and adsorption on activated carbon. The first stage involved cross-flow microfiltration using a 0.2 µm PVDF membrane at 0.5 bar, resulting in reductions of 99% in turbidity and 79% in chemical oxygen demand (COD), as well as a partial reduction in conductivity. The second stage involved 24-h biological treatment in a sequential batch reactor (SBR) with activated sludge (activated sludge index: 80 cm3/g, MLSS 2500 mg/dm3), resulting in further reductions in COD (62%) and TOC (30%), as well as the removal of 46% of total phosphorus (TP) and 35% of total nitrogen (TN). In the third stage, the decantate underwent adsorption in a column containing powdered activated carbon (PAC; 1 g; S_(BET) = 969 m2 g−1), reducing the concentrations of key indicators to the following levels: COD 84%, TOC 70%, TN 77%, TP 87% and suspended solids 97%. Total pollutant retention ranged from 24.6% to 97.0%. These results confirm that the MF–SBR–PAC system is an effective, compact solution that significantly reduces the load of organic and biogenic pollutants in MF retentates, paving the way for their reuse or safe discharge into the environment. Full article
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