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Water
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Advanced Oxidative Methods in Wastewater Treatment
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Advanced Oxidative Methods in Wastewater Treatment

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

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 4354

Special Issue Editor

Prof. Dr. Gopal Achari

E-Mail Website
Guest Editor
Department of Civil Engineering, University of Calgary, Calgary, AB, Canada
Interests: wastewater engineering; contaminant transport and contaminated sites remediation

Special Issue Information

Dear Colleagues,

Advanced oxidation processes (AOPs) for water and wastewater treatment have received a great deal of attention in recent years. This Special Issue of Water is dedicated to the use of AOPs as an effective solution for the treatment (or a polishing step) of drinking water or urban/industrial wastewater treatment.

Thus, the processes of optimization must bear in mind the evolution of the toxicological characteristics of wastewater during treatment. Within this parameter, the aim of this Special Issue is to gather innovative works dealing with the application of advanced oxidation processes for industrial wastewater treatment and detoxification. Research dealing with pollutants (such as emerging contaminants) and pathogen removal from wastewater is also welcome.

Within this context, we would like to invite you to contribute to this issue and to disseminate and share findings on water and wastewater treatment.

Prof. Dr. Gopal Achari
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. 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

  • water and wastewater treatment
  • soil remediation
  • advanced oxidative processes
  • photolysis and photocatalysis
  • greenhouse gas control
  • geopolymers

Published Papers (2 papers)

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Research

21 pages, 3513 KiB  
Article
Removal of Organoselenium from Aqueous Solution by Nanoscale Zerovalent Iron Supported on Granular Activated Carbon
by Stanley Onyinye Okonji, Gopal Achari and David Pernitsky
Water 2022, 14(6), 987; https://0-doi-org.brum.beds.ac.uk/10.3390/w14060987 - 21 Mar 2022
Cited by 3 | Viewed by 1819
Abstract
Nanoscale zerovalent iron particles (nZVI) immobilized on coconut shell-based granular activated carbon (GAC) were studied to remove organoselenium from wastewater. A chemical reduction technique that involves the application of sodium borohydride was adopted for the adsorbent preparation. The texture, morphology and chemical composition [...] Read more.
Nanoscale zerovalent iron particles (nZVI) immobilized on coconut shell-based granular activated carbon (GAC) were studied to remove organoselenium from wastewater. A chemical reduction technique that involves the application of sodium borohydride was adopted for the adsorbent preparation. The texture, morphology and chemical composition of the synthesized adsorbents were analyzed with a scanning electron microscope (SEM), nitrogen adsorption–desorption isotherms and X-ray diffraction (XRD). Batch experiment with various pHs and contact times were conducted to evaluate nZVI/GAC adsorption performance. The results showed that nZVI/GAC has a strong affinity to adsorb selenomethionine (SeMet) and selenocysteine (SeCys) from wastewaters. The maximum removal efficiency for the composite (nZVI/GAC) was 99.9% for SeCys and 78.2% for SeMet removal, which was significantly higher than that of nZVI (SeCy, 59.2%; SeMet, 10.8%). The adsorption kinetics were studied by pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetic models. Amongst the two, PSO seemed to have a better fit (SeCy, R2 > 0.998; SeMet, R2 > 0.999). The adsorption process was investigated using Langmuir and Freundlich isotherm models. Electrostatic attraction played a significant role in the removal of organoselenium by nZVI/GAC adsorption. Overall, the results indicated that GAC-supported nZVI can be considered a promising and efficient technology for removing organoselenium from wastewater. Full article
(This article belongs to the Special Issue Advanced Oxidative Methods in Wastewater Treatment)
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15 pages, 3749 KiB  
Article
Using Sawdust Derived Biochar as a Novel 3D Particle Electrode for Micropollutants Degradation
by Athanasia Petala, Georgios Bampos and Zacharias Frontistis
Water 2022, 14(3), 357; https://0-doi-org.brum.beds.ac.uk/10.3390/w14030357 - 26 Jan 2022
Cited by 9 | Viewed by 2002
Abstract
This work examined the use of a 3D combined electrochemical process based on particle electrodes from sawdust-derived biochar pyrolized at T = 550–850 °C to remove persistent pollutants. The as-prepared biochar was characterized by scanning electron microscopy with an X-ray energy dispersive spectrometer [...] Read more.
This work examined the use of a 3D combined electrochemical process based on particle electrodes from sawdust-derived biochar pyrolized at T = 550–850 °C to remove persistent pollutants. The as-prepared biochar was characterized by scanning electron microscopy with an X-ray energy dispersive spectrometer (SEM/EDS), nitrogen adsorption (BET method) and X-ray diffraction (XRD) techniques. The use of sawdust biochar pyrolized at 650 °C led to a significant increase in efficiency against the sum of conventional 2D electrochemical systems and adsorption, and the synergy index estimated equal to 74.5% at optimum conditions. Sulfamethoxazole (SMX) removal was favored by increasing particle electrode loading. Despite that, the reaction was slightly favored in near-neutral conditions; the system retained most of its activity in the pH range 3–10. The proposed 3D system could degrade different micropollutants, namely SMX, Bisphenol A (BPA), Propylparaben (PP), and Piroxicam (PR). Of particular interest was that no significant reduction in degradation was observed in the case of complex or real water matrices. In addition, the system retained its efficiency regarding SMX removal after five sequential experiments in the 3D combined electrochemical process. However, further investigation is needed to estimate the contribution of the different mechanisms of micropollutant removal in the proposed system. Full article
(This article belongs to the Special Issue Advanced Oxidative Methods in Wastewater Treatment)
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