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Physical–Chemical Wastewater Treatment Technologies, 2nd Edition

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

Deadline for manuscript submissions: 25 November 2026 | Viewed by 2138

Special Issue Editors


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Guest Editor
Department of Chemical Engineering, University of Alicante, Ap. 99, E-03080 Alicante, Spain
Interests: phase equilibrium; water quality; electromagnetic treatment; contamination of sediments and marine organisms; emerging contaminants; wastewater; microorganisms
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Chemical Engineering, University of Alicante, Ap. 99, E-03080 Alicante, Spain
Interests: water analysis; environmental chemistry; water quality; geochemistry; water treatment; environmental analysis; water quality analysis

Special Issue Information

Dear Colleagues,

It is well known that wastewater contains organic and inorganic pollutants, and they may pose hazards to human health and ecosystems. The current action plans regarding the circular economy call for wastewater treatment plants (WWTPs) to be turned into water resource recovery facilities (WRRFs). In this scenario, treatment activities are focused on improving water and sewage sludge quality for recovery opportunities and minimizing environmental damage. Physical–chemical treatments are particularly important to remove water-insoluble substances or colloids. This is achieved through the addition of coagulants and flocculants. Conventional processes are focused on macropollutants including suspended solids, organic carbon, nitrogen, phosphorus and pathogens from wastewater; however, they are not designed to effectively remove micropollutants, such as recalcitrant pharmaceuticals. Finding the proper technology to remove these compounds is still challenging.

In this Special Issue, we invite submissions studying recent advances in the field of physical–chemical treatments for wastewater, including theoretical and experimental analyses, as well as comprehensive review papers. They will undoubtedly contribute to the knowledge and development of the technology. The following topics are proposed, although other related topics are also welcome:

  • Development of new physical, chemical and hybrid treatments for wastewater containing micropollutants;
  • Improvement of existing methods to achieve higher removal of pollutants;
  • Development of cost-effective methods;
  • Analysis of emerging micropollutants in wastewater and sewage sludge;
  • Fate and transport of pollutants in water and sewage sludge.

We look forward to receiving your contributions.

Dr. María Dolores Saquete
Prof. Dr. Nuria Boluda Botella
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 250 words) can be sent to the Editorial Office for assessment.

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

  • micropollutants
  • emerging pollutants
  • persistent organic pollutants
  • advanced wastewater technologies
  • sewage sludge pollution
  • physical–chemical treatments

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Published Papers (1 paper)

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Research

19 pages, 2792 KB  
Article
Sustainable Wastewater Treatment Through Anaerobic Digestion in the Instant Coffee Industry: A Techno-Economic and Environmental Assessment
by Rosa Alexandra Córdova-Mosquera, Carlos Augusto Morales-Paredes, Iris B. Pérez-Almeida, María Dolores Saquete, Nuria Boluda-Botella, Deny Oliva-Merencio, José-Manuel Pais-Chanfrau, Joan Manuel Rodríguez-Díaz and Ileana Pereda-Reyes
Water 2025, 17(22), 3207; https://doi.org/10.3390/w17223207 - 10 Nov 2025
Cited by 1 | Viewed by 1759
Abstract
The coffee industry generates wastewater with high organic loads, which represents both an environmental challenge and a potential resource. This study proposes a novel, integrated solution for an instant coffee plant in Ecuador by incorporating anaerobic digestion into the treatment train. The approach [...] Read more.
The coffee industry generates wastewater with high organic loads, which represents both an environmental challenge and a potential resource. This study proposes a novel, integrated solution for an instant coffee plant in Ecuador by incorporating anaerobic digestion into the treatment train. The approach uniquely combines rigorous kinetic analysis with a comprehensive techno-economic and sustainability assessment. Long-term operation of upflow anaerobic filters confirmed the superior stability and performance of the mesophilic regime. Under these conditions, the process achieved a methane yield of 200.5 mLCH4 g−1COD and a chemical oxygen demand (COD) removal efficiency of 64.1%. The experimental data fitted to the modified Stover–Kincannon and Grau second-order kinetic models (R2 > 0.95) validating the robustness of the mesophilic operation. For the technological proposal, a hydraulic retention time of 7.3 days and an organic loading rate of 1.03 kgCOD m−3 d−1 were established. The economic evaluation confirms that a minimum price of USD 171 per 60 kgbag is required to achieve a positive net present value with a payback period of 5.47 years. Furthermore, the system transitions the facility’s energy profile to net-positive status, with an energy recovery ratio of 1.67, and strengthens the environmental sustainability of the proposal. It is concluded that anaerobic digestion is a viable technology from technical, economic, and environmental perspectives, enhancing the performance of the instant coffee industry and generating added value from highly polluting waste. Full article
(This article belongs to the Special Issue Physical–Chemical Wastewater Treatment Technologies, 2nd Edition)
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