Selectivity and competition in the chemical oxidation processes for a binary pharmaceutical system in treated sewage effluent

In this study, the removal of ibuprofen and gemfibrozil by chlorination, ozonation and a combination of ozone/hydrogen peroxide (O3/H2O2) advanced oxidation process (AOP) from treated sewage effluent (TSE) has been investigated. The removals were evaluated as single components and in binary systems...

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Published in:The Science of the total environment 2021-04, Vol.765, p.142704, Article 142704
Main Authors: Farzaneh, Hajar, Loganathan, Kavithaa, Saththasivam, Jayaprakash, McKay, Gordon
Format: Article
Language:English
Subjects:
Advanced oxidation processes
Chlorination
Cost evaluation
Hydrogen Peroxide
Oxidation-Reduction
Ozonation
Ozone
Pharmaceutical Preparations
Pharmaceuticals
Sewage
Water Pollutants, Chemical - analysis
Water Purification
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Summary:In this study, the removal of ibuprofen and gemfibrozil by chlorination, ozonation and a combination of ozone/hydrogen peroxide (O3/H2O2) advanced oxidation process (AOP) from treated sewage effluent (TSE) has been investigated. The removals were evaluated as single components and in binary systems at different oxidant dosages. Chlorination showed insignificant removal for both pharmaceuticals, while ozonation and O3/H2O2 achieved significant removals for both ibuprofen and gemfibrozil. The highest removal efficiency of ibuprofen achieved with ozonation and O3/H2O2 in TSE was 80% at 1.5 mg/L ozone dosage (0.27 mg O3/mg DOC) within 5 min contact time and was not increased at extended times as the ozone residual approached zero in 5 min. For gemfibrozil, complete removals were achieved at ozone dosages of 1 and 1.5 mg/L by both ozonation and O3/H2O2 within 30 s. The rate constants obtained from the second order kinetics study were almost similar for the binary and single component tests, however, the degradation of ibuprofen was around four times faster by O3/H2O2 with a rate constant of 9 × 104 M−1 s−1 in comparison to ozone alone. The results in the single component and binary systems were almost similar for gemfibrozil, but noticeably lower removals of ibuprofen were obtained in the binary system showing the higher selectivity and oxidation demand of gemfibrozil. Although O3/H2O2 has a higher operation cost, but its capability for faster degradation makes it preferable over ozonation only, as more water can be treated on a daily basis or a smaller treatment plant can be used with lower capital cost, which practically becomes more cost efficient. [Display omitted] •Ibuprofen and gemfibrozil removals were poor by Cl2 but high by O3 and O3 + H2O2.•Gemfibrozil was removed within 30 s of contact time by both O3 and O3 + H2O2.•O3 + H2O2 was able to remove 80% of ibuprofen in less than 2 min.•Capital, operation and maintenance cost for full scale ozonation plant is estimated.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2020.142704