Simultaneous ozone and granular activated carbon for advanced treatment of micropollutants in municipal wastewater effluent

The main objective of this study was to compare the efficacy of ozone (O3) and O3 with granular activated carbon (GAC) (O3/GAC) at pilot-scale for the enhanced removal of micropollutants (MPs) from wastewater effluent. The results revealed enhanced removal of tris (2-carboxylethyl) phosphine (TCEP),...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2019-11, Vol.234, p.845-854
Main Authors: Vatankhah, Hooman, Riley, Stephanie M., Murray, Conner, Quiñones, Oscar, Steirer, K. Xerxes, Dickenson, Eric R.V., Bellona, Christopher
Format: Article
Language:English
Subjects:
Adsorption
Enhanced ozonation
Micropollutants
Municipal wastewater reuse
Ozonation
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Summary:The main objective of this study was to compare the efficacy of ozone (O3) and O3 with granular activated carbon (GAC) (O3/GAC) at pilot-scale for the enhanced removal of micropollutants (MPs) from wastewater effluent. The results revealed enhanced removal of tris (2-carboxylethyl) phosphine (TCEP), sucralose, and meprobamate during the O3/GAC treatment experiments compared to the sum of their removal during isolated ozonation and GAC adsorption experiments. The long-term O3/GAC experiment showed the promotive effect of GAC substantially decreased after 20 h of O3 exposure. This decreased performance correlates with changes to GAC surface properties caused by O3. After 6 h of operation, O3 initially led to an increase in Brunauer-Emmett-Teller (BET) surface area on the GAC improving the elimination level of investigated MPs (except N-nitrosomorpholine (NMOR)). However, after 20 h of exposure, O3 ultimately caused structural damages to the GAC surface, decreased the BET surface area in the final stages of the experiment, and a 4-fold increase in O1s:C1s ratio on the GAC surface was observed due to an increase in surface acidic functional groups caused by O3 treatment. •Simultaneous use of ozone and granular activated carbon treatment (O3/GAC) was employed to treat municipal wastewater effluent•The application of O3/GAC initially enhanced the removal of ozone-refractory micropollutant.•The promotive effect of O3/GAC decreased over time.•The impact of O3 on the surface property of GAC was investigated
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2019.06.082