Special Issue "Water and Wastewater Treatment- Energy Efficiency"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Energy and Environment".

Deadline for manuscript submissions: 30 September 2022.

Special Issue Editors

Dr. Javier Miguel Ochando-Pulido
E-Mail Website
Guest Editor
Dr. Srikanth Vuppala
E-Mail Website
Guest Editor
Department of Civil and Environmental Engineering, Politecnico Di Milano, Piazza Leonardo da Vinci, 32, 20133 Milano MI, Italy
Interests: water and wastewater treatment; photocatalysis; membrane treatment; characterization of nanoparticles; environmental monitoring; water quality assessment; nanomaterials synthesis

Special Issue Information

Dear Colleagues,

Wastewater treatment involves several processes. Among those processes, some techniques consume a significant amount of energy, which obviously increases the operational cost of the industry. Since the 1960s, following as an increase of public concern on environmental quality, internationally strict regulations of wastewater disposal practices have come into effect which require higher levels of treatment. In general, municipal, or industrial wastes requires pre-treatment alone or sequential processes such as coagulation and then biological processes before membrane purification. This level of treatment often becomes a necessity. In fact, wastewater treatment technology has advanced to the point where it has become possible to remove virtually all pollutants from sewage. This is so expensive, however, that such high levels of treatment are not usually justified.

Wastewater treatment plants have become large, complex facilities that require considerable amounts of energy for their operation. Advanced pollution control methods might not only help to conserve energy but also serve to recycle nutrients and replenish groundwater supplies. Thus, a focus on increasing energy efficiency and decreasing energy consumption is necessary, and as such, recent strategies have been dedicated to reducing wastewater treatment costs to obtain low cost treatment methods. This aspect is receiving a large amount of attention as governments around the world encourage the development of eco-friendly wastewater treatment methods.

Based on this scenario, this Special Issue will have an interdisciplinary focus, including wastewater treatment techniques, the revalorization of agro-food industries, materials, biological treatment, chemical engineering and the energy and environmental engineering areas, with the aim to publish high-quality research papers as well as review articles addressing recent advances in energy efficiency considerations in wastewater treatment processes.

Potential topics include but are not limited to:

  • Increasing energy efficiency of techniques in wastewater treatment methods;
  • Recovery and re-use of wastes;
  • Materials: novel nanoparticles and advanced materials;
  • Electro-coagulation, assessment of beneficial effects of energy involved treatment methods such as photocatalysis;
  • Anaerobic digestion; photocatalytic membrane treatment.

Dr. Javier Miguel Ochando-Pulido
Dr. Srikanth Vuppala
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 papers will be 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. Energies 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 2000 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.


  • wastewater treatment techniques
  • energy
  • innovative materials
  • energy and environment
  • economical assessment
  • recovery and re-use
  • pre-treatments
  • advanced oxidation processes
  • heterogeneous photocatalysis
  • membrane treatment

Published Papers (1 paper)

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Formation and Optimization of Electrical Discharge Coatings Using Conventional Electrodes
Energies 2021, 14(18), 5691; https://doi.org/10.3390/en14185691 - 10 Sep 2021
Viewed by 357
An emerging topic is electrical discharge (ED) coating with its application on complex shapes and cavities to repair components or act as functional coatings. Because it is a variant process of an electric discharge machine (EDM) with the ability to coat on electrically [...] Read more.
An emerging topic is electrical discharge (ED) coating with its application on complex shapes and cavities to repair components or act as functional coatings. Because it is a variant process of an electric discharge machine (EDM) with the ability to coat on electrically conductive substrates, there is a possibility that next-generation electrical discharge machining components may exploit the attachment phenomenon to enhance recast layer properties. Previously, researchers have obtained ED coating by mixing the powder in a dielectric medium and/or by using powder metallurgy electrodes. In this work, primarily, an insight in the formation of ED coating on-die sinks electrical discharge machine, using conventional electrode materials viz., bronze on titanium alloy (Ti-6Al-4V) is made. The bronze electrode on the titanium substrate obtained a crack-free copper coating of ~20 microns thickness. In order to perform the experiments, three combinations were made using five parameters: current (Amps), ton (µs), Toff (µs), duty cycle (%), and flushing pressure as constant (bar). After obtaining the coating, a combination of input parameters was selected by optimizing the output performance parameters, viz., the electrical discharge deposition rate, coating thickness, micro-cracks, and elemental coating composition. Secondarily, different optimization techniques viz., grey relational analysis, the technique for order of preferences by similarity to ideal solution, −nD angle method and information divergence method were implemented to find out the suitable combination of parameters where the latter two methods were introduced for the first time in this area of EDM optimization. A study was conducted to check whether the latter two methods are optimization techniques or multi-criteria decision-making techniques. The optimization of existing reactor types and the development of new reactors in wastewater treatment through EDC, by which energy could be saved by replacing the conventional techniques. Full article
(This article belongs to the Special Issue Water and Wastewater Treatment- Energy Efficiency)
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