Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 18, Pages 22214-22224Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-08141-4
Keywords
Propylparaben; Persulfate; UVA radiation; Zero-valent iron; Doehlert design; Radical scavengers; Toxicity prediction
Categories
Funding
- Brazilian National Council for Scientific and Technological Development (CNPq) [131467/2017-4]
- Sao Paulo Research Foundation (FAPESP) [2013/50218-2]
Ask authors/readers for more resources
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).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available