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Ozone Diffusion through a Hollow Fiber Membrane Contactor for Pharmaceuticals Removal and Bromate Minimization
Alice Schmitt1, Julie Mendret1, Hani Cheikho1
1IEM, University of Montpellier, CNRS, ENSCM, 34095 Montpellier, France.
Membranes
|February 25, 2023
Summary
Hollow fiber membrane contactors (HFMC) offer an effective method for removing emerging contaminants like pharmaceuticals from wastewater. This ozonation technique significantly reduces bromate byproduct formation compared to traditional bubble reactors.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
- Advanced Oxidation Processes
Background:
- Ozonation is a promising advanced oxidation process for emerging contaminant removal.
- Conventional bubble reactors for ozonation can lead to significant bromate formation, a regulated drinking water contaminant.
- Hollow fiber membrane contactors (HFMC) offer an alternative with potentially lower residual ozone and byproducts.
Purpose of the Study:
- To evaluate the efficacy of ozonation using HFMC for pharmaceutical abatement in wastewater.
- To compare bromate formation during ozonation with HFMC versus bubble columns.
- To assess the generation of hydroxyl radicals during ozonation with HFMC.
Main Methods:
- Ozonation of real treated wastewater spiked with p-chlorobenzoic acid (p-CBA) and bromide using a HFMC system.
- Tracking p-CBA abatement to monitor hydroxyl radical production.
- Comparing bromate formation and pharmaceutical removal (carbamazepine, sulfamethoxazole) between HFMC and bubble column reactors.
Main Results:
- HFMC ozonation resulted in 1600 µg.L⁻¹ bromate formation at 100% p-CBA abatement, significantly lower than 3486 µg.L⁻¹ in bubble columns.
- HFMC demonstrated efficient hydroxyl radical production, indicated by p-CBA abatement.
- High removal rates of carbamazepine and sulfamethoxazole were achieved with HFMC at short contact times (approx. 2s) without significant bromate formation.
Conclusions:
- HFMC ozonation is effective for pharmaceutical abatement in wastewater.
- HFMC technology significantly minimizes bromate formation compared to bubble columns.
- This method offers a promising approach for advanced wastewater treatment, balancing contaminant removal with byproduct control.
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