Comparison between UVA- and zero-valent iron-activated persulfate processes for degrading propylparaben

Autor(es)

Palharim, Priscila H. ^[1] ; Graca, Catia A. L. ^[2] ; Teixeira, Antonio C. S. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Chem Engn, Res Grp Adv Oxidat Proc AdOx, Av Prof Luciano Gualberto 380, Tv 3, BR-05508900 Sao Paulo - Brazil

^[2] Univ Porto, Dept Engn Quim, LSRE LCM, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 27, n. 18 MAR 2020.
• Citações Web of Science: 3

Resumo

Conventional wastewater treatments are not efficient in removing parabens, which may thus end up in surface waters, posing a threat to aquatic biota and human health. As an alternative treatment, persulfate (PS)-driven advanced oxidation technologies have gained growing attention for removing these pollutants. In this study, the degradation of propylparaben (PrP) by UVA- and zero-valent iron (ZVI)-activated persulfate was investigated. The effects of initial PS concentration ({[}PS](0)) and irradiance or ZVI concentration were explored using the Doehlert experimental design. For the UVA-activated system, the specific PrP degradation rate (k) and percent removal were consistently higher for increasing {[}PS](0) and irradiance, varying in the ranges 0.0053-0.0192 min(-1) and 37.9-77.3%, respectively. In contrast, extremely fast PrP degradation was achieved through the ZVI/PS process (0.3304 < k < 0.9212 min(-1)), with removal percentages above 97.5%; in this case, paraben degradation was hindered for a ZVI dosage beyond 40 mg L-1. Regarding toxicity, ECOSAR predictions suggest that the degradation products elucidated by LC-MS/MS are less toxic than PrP toward fish, daphnid, and green algae. In addition, both processes showed to be strongly dependent on the water matrix, being ZVI/PS more impacted for a MBR effluent, although its performance was much better than that exhibited by the UVA-driven process (t(1/2) of 65.4 and 276.1 min, respectively). (AU)

• Processo FAPESP: 13/50218-2 - CEPEMA - Centro Cooperativo em Engenharia Ambiental
• Beneficiário: Claudio Augusto Oller do Nascimento
• Modalidade de apoio: Auxílio à Pesquisa - Temático