Removal of Organic Micropollutants from Treated Municipal Wastewater by O3/UV/H2O2 in a UVA-LED Reactor.

Autor: Schoenell, Elisa Kerber, Otto, Nikolai, Rodrigues, Marco Antônio Siqueira, Metzger, Jörg Wolfgang
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Zdroj: Ozone: Science & Engineering; Mar/Apr2022, Vol. 44 Issue 2, p172-181, 10p
Abstrakt: Organic micropollutants (OMPs) have been widely detected in the aqueous environment and their effect on the environment and human health has been studied. The removal of OMPs from effluents of a conventional urban wastewater treatment plant by ozonation as well as photo-enhancement of ozonation using UVA-LED panels and photolysis in the presence and absence of hydrogen peroxide was investigated. In a novel semi-technical reactor municipal wastewater was treated for 2 hours, using ozone – O3 (3 mg O3·L−1) and in combination with UVA-LED – O3/UV (peak wavelength 371 nm, 0.78 W·m−2) and in combination with UVA-LED and hydrogen peroxide – O3/UV/H2O2 (20 mg H2O2·L−1). The highest removal fractions for all OMPs were obtained with O3/UV/H2O2 (candesartan: 93.3%, irbesartan: 79.9%, 1 H-benzotriazole: 42.2%, hydrochlorothiazide: 40.8%, 4-/5-methyl-1 H-benzotriazole: 39%, and metoprolol: 24%) and with O3 (diclofenac: 87.2%, carbamazepine: 76.4%, and sulfamethoxazole: 53.5%). As a conclusion of the different AOP combinations of this study, UV photo-enhancement of ozonation has much more beneficial effects on OMP removal when it is combined with an additional H2O2 dosing. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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