Cited by 532Advanced oxidation water treatmentWater Treatment and DisinfectionEnvironmental and Analytical Chemistry Studies

Advanced oxidation processes (AOPs) based wastewater treatment-unexpected nitration side reactions—A serious environmental issue: A review

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Rayaroth, Manoj P., Aravindakumar, Charuvila T., Shah, Noor S., Boczkaj, Grzegorz·2022·Chemical Engineering Journal

Abstract

Chemical compounds containing nitro group (nitro-products) are a one of toxic by-products, that can be formed during wastewater treatment processes. In case of presence of nitrite or nitrate ions, the formation of nitro-products during advanced oxidation processes (AOPs) is very common. It is caused by the reactive nitrogen species (RNs) such as nitrate radical (NO3•), nitrite radical (NO2•), nitrogen oxide radical (NO•) and peroxynirite (ONOO–). In fact, the oxidative degradation of N-containing pollutants releases nitrate, nitrite and ammonium ions. In some cases, secondary reactions of mineralised nitrogen species (nitrate and nitrite ions) with the parent or intermediate compound generate next several nitro-products. The nitro-products are more toxic comparing to the primary pollutants and act as the precursors of the nitrogenous disinfection by-products. Moreover, some studies reported unexpected nitro-products formation during the oxidative degradation. In case of such processes a special attention should be made to monitor and minimize these effects. De-nitration of the initial nitro-compounds induces the formation of various nitro-products in AOPs. It was observed for UV light driven, Fenton and persulfate based AOPs. The sonochemical nitrogen fixation is a key mechanism for the formation of nitro-compounds in ultrasounds based AOPs. Therefore, this paper is focused on comparison of various AOPs in terms of nitro-products formation mechanisms and the associated environmental issues.

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Crossref · 10.1016/j.cej.2021.133002

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  • Degradation of organic contaminants by AOPs such as UV/H2O2 photolysis, photocatalysis, Fenton, electro-Fenton or cavitation-based methods results in good degradation and mineralization efficiency.

    “The degradation of contaminants and their derivatives by various AOPs, such as UV/H2O2 photolysis, photocatalysis, Fenton, electro-Fenton or cavitation-based methods, etc., resulted in good degradation and mineralization efficiency [11-16].”

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Authors
Rayaroth, M. P., Aravindakumar, C. T., Shah, N. S., & Boczkaj, G.
Affiliations
  • Gdańsk University of Technology (PL)
  • Mahatma Gandhi University (IN)
  • COMSATS University Islamabad (PK)
Corresponding author
Boczkaj, Grzegorz
Venue
Chemical Engineering Journal
Publisher
Elsevier BV
Published
2022-02
Volume
430
Pages
133002
ISSN
1385-8947 (ISSN-L)
OpenAlex
W3209537840
Cited by
532
References
158
Citations by year
2026: 80 · 2025: 102 · 2024: 130 · 2023: 116 · 2022: 104
FWCI
26.04
Type
journal article
Language
en
Open access
Locations
Chemical Engineering Journal (publishedVersion, cc-by)
Funders
Narodowe Centrum Nauki (UMO-2017/25/B/ST8/01364)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Water Treatment and Disinfection
  • Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
Keywords
advanced oxidation processes, nitrite, nitrate, reactive nitrogen species, nitrate radical, nitrite radical, peroxynitrite, nitrogenous disinfection by-products, Fenton oxidation, persulfate, wastewater treatment, toxic by-products

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