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Water Pollution and Wastewater Treatment Chemistry

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Chemical and Molecular Sciences".

Deadline for manuscript submissions: 30 September 2025 | Viewed by 210

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Guest Editor
Department of Environmental Engineering and Management, Cristofor Simionescu Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania
Interests: environmental engineering and management; water and wastewater treatment technology and management
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Special Issue Information

Dear Colleagues,

We would like to invite you to contribute an original research paper or a review article to this Special Issue of Applied Sciences, entitled “Water Pollution and Wastewater Treatment Chemistry”, for peer review and possible publication.

The continuous growth of socio-economic development in human society requires the utilization of increasing quantities of water and, in most cases, demands a specific water quality. There is a clear difference, however, between the quality of natural water resources (groundwater and surface waters), the quality of treated or untreated wastewater (WW), and the quality of water required by consumers (as drinking water, irrigation water, industrial water, etc.). This difference can be eliminated or minimized with the application of appropriate water and/or wastewater treatment technologies.

A ‘good’ water quality is required in all natural resources in all communities around the world, especially in surface waters which support a wide range of discharges (wanted or non-wanted/accidental with residual pollutants). Wastewater treatment has now become a necessity as natural resources are rapidly depleting while the demand for water continues to increase for all domestic and commercial human consumption.

Many pollution episodes are caused by the discharge of inadequately treated effluents and therefore require the adequate control of and improvement of the performance of water/wastewater treatment processes through either of the following: the separation of impurities from water/wastewater, i.e., based on fluid mechanics (sedimentation, centrifugation, filtration, flotation, or synthetic membranes as micro-, ultra-, and nanofiltration, as well as reverse osmosis), in association with physical–chemical processes for the separation of dissolved or emulsified compounds from different types of processed waters/wastewaters (chemical precipitation, adsorption onto granular activated charcoal and coagulation–flocculation, ionic exchange, disinfection by chlorination or ozonation, and others), or through the partial or complete mineralization of contaminants (advanced oxidation with ozone, hydrogen peroxide in the presence of specific catalysts and UV/natural solar radiation, different biological (enzymatic) and individual chemical or mixed processes in activated sludge basin/reactor, or membrane bioreactors).

We welcome contributions of original unpublished research papers or review articles focusing on, but not limited to, new water/wastewater treatment concepts; mechanism interpretations for reducing water pollution and the improvement of wastewater treatment; control of aquatic polluting species chemistry in different applications; new advanced methods of water analysis and their applications in wastewater characterization and water pollution level assessments; supervising monitoring and remediation/depollution implementation action; and water management practices.

Dr. Carmen Zaharia
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. Applied Sciences 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 2400 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/wastewater
  • treatment processes
  • water quality
  • treatment efficiency
  • pollution impact and risk assessment
  • water quality index

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Published Papers (1 paper)

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Research

17 pages, 2458 KiB  
Article
Kinetics of H2O2 Decomposition and Bacteria Inactivation in a Continuous-Flow Reactor with a Fixed Bed of Cobalt Ferrite Catalyst
by Nazarii Danyliuk, Viktor Husak, Volodymyra Boichuk, Dorota Ziółkowska, Ivanna Danyliuk and Alexander Shyichuk
Appl. Sci. 2025, 15(15), 8195; https://doi.org/10.3390/app15158195 - 23 Jul 2025
Viewed by 44
Abstract
As a result of the catalytic decomposition of H2O2, hydroxyl radicals are produced. Hydroxyl radicals are strong oxidants and effectively inactivate bacteria, ensuring water disinfection without toxic chlorinated organic by-products. The kinetics of bacterial inactivation were studied in a [...] Read more.
As a result of the catalytic decomposition of H2O2, hydroxyl radicals are produced. Hydroxyl radicals are strong oxidants and effectively inactivate bacteria, ensuring water disinfection without toxic chlorinated organic by-products. The kinetics of bacterial inactivation were studied in a laboratory-scale flow catalytic reactor. A granular cobalt ferrite catalyst was thoroughly characterized using XRD and XRF techniques, SEM with EDS, and Raman spectroscopy. At lower H2O2 concentrations, H2O2 decomposition follows first-order reaction kinetics. At higher H2O2 concentrations, the obtained kinetics lines suggest that the reaction order increases. The kinetics of bacterial inactivation in the developed flow reactor depends largely on the initial number of bacteria. The initial bacterial concentrations in laboratory tests were within the range typical of real river water. A regression model was developed that relates the degree of bacterial inactivation to the initial number of bacteria, the initial H2O2 concentration, and the contact time of water with the catalyst. Full article
(This article belongs to the Special Issue Water Pollution and Wastewater Treatment Chemistry)
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