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Journals / Sigma Journal of Engineering and Natural Sciences / 2013 / Cilt: 31 Sayı: 4

ADVANCED OXIDATION OF A NONIONIC SURFACTANT: EXAMINATION OF THE DEGRADATION PRODUCTS – ACUTE TOXICITY RELATIONSHIP

Akın KARCI
İdil ARSLAN ALATON
Miray BEKBÖLET
Pages
508–516
Publication Date
2013-12-01
DOI
—
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AI Summary & Key Takeaways

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⚡ TL;DR(Too Long; Didn't Read)

A positive relationship was evidenced between the concentration of degradation products and the level of acute toxicity.

📌 3 Key Takeaways

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Objective & Hypothesis:Degradation products formed during removal of an aqueous nonylphenol ethoxylate compound (NP-10) by the H2O2/UV-C, Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) advanced oxidation processes and their relationship with the acute toxicity toward Vibrio fischeri photobacteria were investigated.
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Key Findings & Data:Polyethylene glycols with 3-8 ethoxy units, aldehydes and carboxylic acids were identified as the primary degradation products of the studied treatment processes.
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Conclusion & Impact:A positive relationship was evidenced between the concentration of degradation products and the level of acute toxicity.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Acute toxicity · degradation products · nonylphenol decaethoxylate

Abstract

Degradation products formed during removal of an aqueous nonylphenol ethoxylate compound (NP-10) by the H2O2/UV-C, Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) advanced oxidation processes and their relationship with the acute toxicity toward Vibrio fischeri photobacteria were investigated. Polyethylene glycols with 3-8 ethoxy units, aldehydes and carboxylic acids were identified as the primary degradation products of the studied treatment processes. A strong correlation was found between the acute toxicity and the aldehydes and carboxylic acids formed during the H2O2/UV-C and photo-Fenton processes. Higher concentrations of aldehydes and carboxylic acids in the H2O2/UV-C process (1.24 and 32 mg L-1, respectively) than in the photo-Fenton oxidation (0.36 and 21 mg L-1, respectively) were speculated to cause the higher inhibitory effect (24% relative inhibition) observed in the H2O2/UV-C process. The Fenton process was rather inefficient for the removal of NP-10 (20% removal), resulting in the generation of only low concentrations of degradation products (0.14 mg L-1 aldehyde and 4.58 mg L-1 carboxylic acid) and a residual toxicity (10% relative inhibition) nearly at the same level with that of the untreated pollutant (9% relative inhibition). A positive relationship was evidenced between the concentration of degradation products and the level of acute toxicity.

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Cite This Article

KARCI, A., ALATON, İ. A., BEKBÖLET, M. (2013). ADVANCED OXIDATION OF A NONIONIC SURFACTANT: EXAMINATION OF THE DEGRADATION PRODUCTS – ACUTE TOXICITY RELATIONSHIP. Sigma Journal of Engineering and Natural Sciences, Cilt: 31 Sayı: 4, 508–516. https://ajindex.com/articles/897978

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