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

Authors : Akın KARCI, İdil ARSLAN ALATON, Miray BEKBÖLET

Pages : 508-516

View : 34 | Download : 7

Publication Date : 2013-12-01

Article Type : Research Paper

Abstract :Degradation products formed during removal of an aqueous nonylphenol ethoxylate compound insert ignore into journalissuearticles values(NP-10); by the H2O2/UV-C, Fenton insert ignore into journalissuearticles values(Fe2+/H2O2); and photo-Fenton insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(1.24 and 32 mg L-1, respectively); than in the photo-Fenton oxidation insert ignore into journalissuearticles values(0.36 and 21 mg L-1, respectively); were speculated to cause the higher inhibitory effect insert ignore into journalissuearticles values(24% relative inhibition); observed in the H2O2/UV-C process. The Fenton process was rather inefficient for the removal of NP-10 insert ignore into journalissuearticles values(20% removal);, resulting in the generation of only low concentrations of degradation products insert ignore into journalissuearticles values(0.14 mg L-1 aldehyde and 4.58 mg L-1 carboxylic acid); and a residual toxicity insert ignore into journalissuearticles values(10% relative inhibition); nearly at the same level with that of the untreated pollutant insert ignore into journalissuearticles values(9% relative inhibition);. A positive relationship was evidenced between the concentration of degradation products and the level of acute toxicity.
Keywords : Acute toxicity, degradation products, nonylphenol decaethoxylate, the Fenton process, the H2O2 UV C process, the photo Fenton process

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