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Enhanced ciprofloxacin degradation via photo-activated persulfate using the effluent of a large wastewater treatment plant

Topics in Catalysis, ISSN: 1572-9028, Vol: 65, Issue: 9-12, Page: 1128-1138
2022
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Article Description

Antibiotics such as ciprofloxacin (CIP) remain in aquatic environments, causing environmental and public health disturbances. Furthermore, in traditional wastewater treatment plants (WWTP), those compounds are not removed efficiently; owing to the effluent complexity and the ions present in it. The CIP degradation was assessed in real (RWW) and simulated (SWW) effluents of a WWTP, using the activated persulfate mechanism with the magnetic fraction (MF) of a low-grade titanium ore and simulated sunlight (SSL). All tests were performed in a 1000 mL raceway reactor under SSL. CIP and persulfate concentrations were measured using a high-performance liquid chromatography and UV spectroscopy, respectively. A 100% removal of CIP was achieved for RWW and SWW in 15 and 60 min, respectively without residual persulfate. These results may indicate that the contents of nitrate, chloride and total solids present in these samples of wastewater, did not have a significant negative effect on the CIP degradation efficiency. The final pH average value (~ 8.5) of real and simulated wastewater tests may indicate the presence of both hydroxyl and sulfate radicals without pH modification needed. However, only the sulfate radical was identified in the tests. An increase in toxicity was observed in the CIP degradation test with SWW (11%) and RWW (0.8%), which might be associated with the presence of CIP transformation products. The biodegradability also increased after the treatment. Both data showed that the MF-PS-SSL system produced an effluent that can be discharged or eventually treated using biological processes for indirect potable water reuse. These results highlight the use of the magnetic fraction as a strong alternative Fe source instead of costly commercial compounds, for wastewater treatment, which allows the valorization of a raw material generally rejected in conventional TiO production.

Bibliographic Details

José Alberto Macías-Vargas; Mariana Lizeth Díaz-Ramírez; Tania Ariadna García-Mejía; Rosa María Ramírez-Zamora

Springer Science and Business Media LLC

Chemical Engineering; Chemistry

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