Tube-in-tub e membrane photoreactor as a new technology to boost sulfate radic al advanced oxidation processes

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Elisabeth Cuervo Lumbaque (Author) Other; Diogo S. Lüdtke (Author) Other; Dionysios D. Dionysiou (Author) Other; Vítor J. P. Vilar (Author) FEUP; Carla Sirtori (Author) Other

Journal

Title: Water Research

Vol. 191

Pages: 1-12

ISSN: 0043-1354

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-00T-CGV

DOI: 10.1016/j.watres.2021.116815

Abstract (EN): This work proposes a tube-in-tube membrane photoreactor, operated in a continuous-mode, to boost the efficiency of peroxydisulfate (PDS), through the photolytic (UV-C radiation) and photocatalytic (TiO(2)P25) processes. This new technology can efficiently facilitate the transportation of PDS to the catalyst surface and water to be treated. The ultrafiltration tubular ceramic membrane was used as support for the TiO2-P25 and oxidant-catalyst/water contactor. Tests were performed using a synthetic solution and a municipal secondary effluent, both spiked with a pharmaceutical mix solution (paracetamol (PCT), furosemide (FRS), nimesulide (NMD), and diazepam (DZP); 200 mu g L-1 of each). At steady-state regime, the UVC/S2O82-/TiO2 system, with radial PDS addition, showed the highest removal of pharmaceuticals in both matrices. Furthermore, twenty-two transformation products (TPs) were identified by applying LCQTOF MS technique. Hence, the transformation pathways including hydroxylation in aromatic moiety by an electrophilic attack, electron transfer reactions, cleavage of C- O, C- N bond, H- abstraction and ring opening were proposed. TPs chemical structures were evaluated by in silico (Q)SAR approach using TOXTREE and EPI Suite (TM) software.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12