A tube-in-tube membrane microreactor for tertiary treatment of urban wastewaters by photo-Fenton at neutral pH: A proof of concept

• Type: Article in International Scientific Journal
• Date: 2021-08-24

Authors

Vítor Vilar (Author) FEUP; Rui Boaventura (Author) FEUP; Ana Gomes (Author) FEUP; Jennyfer Díaz-Angulo (Author) Other; Salvador Cotillas (Author) Other; Sandra Miranda (Author) Other; Miguel Mueses (Author) Other; Manuel Rodrigo (Author) Other; Fiderman Machuca (Author) Other

Journal

Title: Chemosphere

Vol. 263 No. 128111

Pages: 1-9

ISSN: 0045-6535

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 5 Citations

Scientific classification

CORDIS: Technological sciences > Technology > Environmental technology

FOS: Engineering and technology > Environmental engineering

Associated Projects

0725_NOR_WATER_1_P - Poluentes emergentes nas águas da Galiza-Norte de Portugal: novas ferramentas para gestão de risco

Other information

Authenticus ID: P-00S-NGH

DOI: 10.1016/j.chemosphere.2020.128049

Abstract (EN): This work presents a disruptive approach to promote highly-efficient photo-Fenton process at neutral pH under continuous mode operation. The system consists of a tube-in-tube membrane reactor designed for continuous-flow titration of low iron doses to the annular reaction zone (ARZ). A concentrated acidic ferrous ion (Fe2+) solution is fed by the lumen-side of the membrane, permeating through the membrane pores (inside-out mode), being dosed and uniformly delivered to the membrane shell-side. Polluted water, containing amoxicillin (AMX) and oxidant (H2O2), flows continuously in the reactor annulus (space between the membrane shell-side and an outer quartz tube). The catalyst radial dispersion is enhanced by the helicoidal movement of water around the membrane shell-side, efficiently promoting its contact with H2O2 and UV light. The efficiency of photochemical and photocatalytic oxidation was evaluated as a function of catalyst dose, catalyst injection mode (radial permeation vs injection upstream from the reactor inlet), light source (UVA vs UVC) and aqueous solution matrix (synthetic vs real wastewater). At steady-state, photo-Fenton reaction with Fe2+ radial addition, driven by UVC light, showed the highest AMX removal for synthetic (similar to 65%, removal rate of 44 mu M-AMX/min, using [Fe2+](ARZ) = 2 mg/L and [H2O2](inlet) = 10 mg/L) and real municipal wastewaters (similar to 45%, removal rate of 31 mu M-AMX/min, with [Fe2+](ARZ) = 5 mg/L and [H2O2] inlet = 40 mg/L), with a residence time of only 4.6 s.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9