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Wastewater Treatment Related to Energy
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Wastewater Treatment Related to Energy

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

Deadline for manuscript submissions: closed (25 January 2024) | Viewed by 10206

Special Issue Editors

Dr. Dominika Sobotka

E-Mail Website
Guest Editor
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland
Interests: wastewater treatment; nitrogen removal and recovery; renewable energy
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jakub Drewnowski

E-Mail Website1 Website2
Guest Editor
Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland
Interests: wastewater treatment; wastewater quality; nitrogen removal and recovery
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, achieving energy neutrality while ensuring high nutrient removal has become the goal of sustainable Wastewater Treatment Plants (WWTPs). In the WWTPs, energy costs account for around 40% of wastewater treatment operational costs; therefore, the search for ways to improve their efficiency while improving their energy balance is crucial. At WWTPs, energy consumption is related to pollution load, which influences treatment methods and technologies. WWTPs are looking for ways to improve 1) the efficiency of removing pollution, 2) the amount of purchased energy, 3) the amount of recovered energy, and 4) the use of renewable energy sources in order to meet the stricter discharge restrictions that the law requires.

This Special Issue aims to present and disseminate the most recent advances related to the theory, modelling, application, and control of all wastewater treatment processes which improve the energy balance of WWTPs. Original submissions focusing on fundamental and/or practical issues related to all subfields of wastewater treatment are welcome.

Dr. Dominika Sobotka
Prof. Dr. Jakub Drewnowski
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 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 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

  • wastewater treatment plant
  • energy neutrality
  • energy efficiency
  • bioenergy

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Published Papers (2 papers)

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Research

15 pages, 4007 KiB  
Article
Electrochemical Production of Sodium Hypochlorite from Salty Wastewater Using a Flow-by Porous Graphite Electrode
by Ahmed A. Afify, Gamal K. Hassan, Hussein E. Al-Hazmi, Rozan M. Kamal, Rehab M. Mohamed, Jakub Drewnowski, Joanna Majtacz, Jacek Mąkinia and Heba A. El-Gawad
Energies 2023, 16(12), 4754; https://doi.org/10.3390/en16124754 - 16 Jun 2023
Cited by 16 | Viewed by 7851
Abstract
The production of sodium hypochlorite (NaOCl) from salty wastewater using an electrochemical cell has several advantages over other methods that often require hazardous chemicals and generate toxic waste, being more sustainable and environmentally friendly. However, the process of producing sodium hypochlorite using an [...] Read more.
The production of sodium hypochlorite (NaOCl) from salty wastewater using an electrochemical cell has several advantages over other methods that often require hazardous chemicals and generate toxic waste, being more sustainable and environmentally friendly. However, the process of producing sodium hypochlorite using an electrochemical cell requires careful control of the operating conditions, such as the current density, flow rate, inert electrode spacing, and electrolyte concentration, to optimize the conversion efficiency and prevent electrode fouling and degradation. In this study, NaOCl was produced via a bench-scale electrochemical cell using a flowing porous graphite electrode in a continuous flow system from salty wastewater collected from the Suez Canal in Egypt. The aim of the investigation was to examine the factors that affect the concentration of NaOCl and energy consumption, such as anodic current density, salinity, inert electrode spacing, and influent feed flow rate. A lab-scale reactor with two electrodes was used to conduct the experiments. The highest NaOCl yield of 20.6% was achieved with a graphite electrode, which had high current efficiency and rigidity at a flow rate of 4.5 mL/min, a current density of 3.183 mA/cm2, an electrode space of 0.5 cm, salinity of 40,000 ppm, and a pH of 6.4. The power consumption under these conditions was 0.0137 kwh. Additionally, a statistical and least square multivariate regression technique was employed to establish a correlation for predicting the % NaOCl production. The obtained correlation had an R2 value of 98.4%. Overall, this investigation provides valuable insights into the production of NaOCl using a continuous flow system from salty wastewater, which could have potential for industrial applications in various sectors such as textiles, detergents, paper, and pulp. Full article
(This article belongs to the Special Issue Wastewater Treatment Related to Energy)
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15 pages, 4145 KiB  
Article
Process Improvement of Biogas Production from Sewage Sludge Applying Iron Oxides-Based Additives
by Regimantas Dauknys and Aušra Mažeikienė
Energies 2023, 16(7), 3285; https://doi.org/10.3390/en16073285 - 6 Apr 2023
Cited by 1 | Viewed by 1672
Abstract
Iron additives are effective in the anaerobic sewage sludge digestion process, but the composition and dosage of these additives are not precisely defined. This research investigates the effects of three iron oxides-based additives on the destruction of volatile solids, the production and quality [...] Read more.
Iron additives are effective in the anaerobic sewage sludge digestion process, but the composition and dosage of these additives are not precisely defined. This research investigates the effects of three iron oxides-based additives on the destruction of volatile solids, the production and quality of biogas, as well as the quality of the supernatant. Additive No 1 contained >41.5% of FeO and >41.5% of Fe2O3, additive No 2 contained ≥86% of Fe3O4, and additive No 3 contained ≥98% of Fe3O4. The best results were obtained by applying an iron oxides-based additive with a higher content of divalent iron oxide. The increase in efficiency of the VSs destruction was not significant and on average 2.2%. The increase in biogas production was on average 20% while the average increase in the content of methane in the biogas was 6.3%. Applying the additive, the reduction in the concentration of ammonium nitrogen in the supernatant was up to 28%, as well as a reduction in the concentration of phosphate phosphorus in the supernatant by up to 3.1 times could be expected compared to the case when the additive was not applied. The dose of additive No 1 was between 7.5 g/kg of dry solids and 15 g/kg of dry solids in the lab-scale test. The dose was specified in the full-scale test, and the recommended dose of the additive was 10 g/kg of dry solids to improve biogas production. Full article
(This article belongs to the Special Issue Wastewater Treatment Related to Energy)
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