ABSTRACT
Traditional methodologies of conventional drinking water treatment are unable to remove some chemical compounds, such as those that cause odor and taste in drinking water. The present work aims to evaluate the efficiency of advanced oxidations processes, using UV radiation, O3 and O3 + UV in the degradation of geosmin (GSM) and 2-methylisoborneol (2-MIB) in synthetic samples. The efficiency of the processes was monitored by Gas Chromatography coupled with Mass Spectrometry using solid phase microextration technique. Experiments were carried out for 45 min with samplings every 15 min. The degradation results showed that UV radiation alone was not efficient for the degradation of both compounds. The fasted decay was observed by the combined use of O3 and UV with an ozone concentration of 15.84 mg L−1. Under these conditions, the final concentration of GSM was below the limit of quantification, so that approximately 99% of the initial concentration was degraded, while 2-MIB was degraded by 95%. With the same O3 concentration without the use of UV radiation, 63% and 65.7% of MIB and GSM, respectively, were removed. Higher efficiency of the treatment was observed with a higher O3 concentration which allows a shorter reaction time.
GRAPHICAL ABSTRACT
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KEYWORDS:
Acknowledgments
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001; by Conselho Nacional de Pesquisa – Brasil (CNPq) -Protocol Numbers 309652/2016-2 and 307599/2018-3; and by Ministério de Ciência, Tecnologia e Inovação (MCTI) – Agreement Number 01.0144.00/2010.
Disclosure statement
No potential conflict of interest was reported by the author(s).
ORCID
Mariana Maria Gassen Berlt http://orcid.org/0000-0001-5911-0085
Rosana de Cassia de Souza Schneider http://orcid.org/0000-0003-1400-8401
Ênio Leandro Machado http://orcid.org/0000-0003-0140-4966
Lourdes Teresinha Kist http://orcid.org/0000-0003-3278-8966