Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS
© 2018 Elsevier Ltd In this study, we comparatively investigated the degradation of 12 trace organic chemicals (TOrCs) during UV/H2O2 and UV/peroxydisulfate (PDS) processes. Second-order rate constants for the reactions of iopromide, phenytoin, caffeine, benzotriazole, and primidone with sulfate rad...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal Article |
| Published: |
IWA Publishing
2018
|
| Online Access: | http://hdl.handle.net/20.500.11937/73251 |
| _version_ | 1848762965153546240 |
|---|---|
| author | Nihemaiti, M. Miklos, D. Hübner, U. Linden, K. Drewes, J. Croue, Jean-Philippe |
| author_facet | Nihemaiti, M. Miklos, D. Hübner, U. Linden, K. Drewes, J. Croue, Jean-Philippe |
| author_sort | Nihemaiti, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 Elsevier Ltd In this study, we comparatively investigated the degradation of 12 trace organic chemicals (TOrCs) during UV/H2O2 and UV/peroxydisulfate (PDS) processes. Second-order rate constants for the reactions of iopromide, phenytoin, caffeine, benzotriazole, and primidone with sulfate radical (SO4•-) were determined for the first time. Experiments were conducted in buffered pure water and wastewater effluent with spiked TOrCs. UV/PDS degraded all TOrCs more efficiently than UV/H2O2 in buffered pure water due to the higher yield of SO4•- than that of hydroxyl radical (•OH) at the same initial molar dose of PDS and H2O2, respectively. UV/PDS showed higher selectivity toward TOrCs removal than UV/H2O2 in wastewater effluent. Compounds with electron-rich moieties, such as diclofenac, venlafaxine, and metoprolol, were eliminated faster in UV/PDS whereas UV/H2O2 was more efficient in degrading compounds with lower reactivity to SO4•-. The fluence-based rate constants (kobs-UV/H2O2) of TOrCs in wastewater effluent linearly increased as a function of initial H2O2 dose during UV/H2O2, possibly due to the constant scavenging impact of the wastewater matrix on •OH. However, exponential increase of kobs-UV/PDS with increasing PDS dose was observed for most compounds during UV/PDS, suggesting the decreasing scavenging effect of the water matrix (electron-rich site of effluent organic matter (EfOM)) after initial depletion of SO4•- at low PDS dose. Fulvic and humic-like fluorophores appeared to be more persistent during UV/H2O2 compared to aromatic protein and soluble microbial product-like fluorophores. In contrast, UV/PDS efficiently degraded all identified fluorophores and showed less selectivity toward the fluorescent EfOM components. Removal pattern of TOrCs during pilot-scale UV/PDS was consistent with lab-scale experiments, however, overall removal rates were lower due to the presence of higher concentration of EfOM and nitrite. |
| first_indexed | 2025-11-14T10:55:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-73251 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:55:56Z |
| publishDate | 2018 |
| publisher | IWA Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-732512023-08-02T06:39:13Z Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS Nihemaiti, M. Miklos, D. Hübner, U. Linden, K. Drewes, J. Croue, Jean-Philippe © 2018 Elsevier Ltd In this study, we comparatively investigated the degradation of 12 trace organic chemicals (TOrCs) during UV/H2O2 and UV/peroxydisulfate (PDS) processes. Second-order rate constants for the reactions of iopromide, phenytoin, caffeine, benzotriazole, and primidone with sulfate radical (SO4•-) were determined for the first time. Experiments were conducted in buffered pure water and wastewater effluent with spiked TOrCs. UV/PDS degraded all TOrCs more efficiently than UV/H2O2 in buffered pure water due to the higher yield of SO4•- than that of hydroxyl radical (•OH) at the same initial molar dose of PDS and H2O2, respectively. UV/PDS showed higher selectivity toward TOrCs removal than UV/H2O2 in wastewater effluent. Compounds with electron-rich moieties, such as diclofenac, venlafaxine, and metoprolol, were eliminated faster in UV/PDS whereas UV/H2O2 was more efficient in degrading compounds with lower reactivity to SO4•-. The fluence-based rate constants (kobs-UV/H2O2) of TOrCs in wastewater effluent linearly increased as a function of initial H2O2 dose during UV/H2O2, possibly due to the constant scavenging impact of the wastewater matrix on •OH. However, exponential increase of kobs-UV/PDS with increasing PDS dose was observed for most compounds during UV/PDS, suggesting the decreasing scavenging effect of the water matrix (electron-rich site of effluent organic matter (EfOM)) after initial depletion of SO4•- at low PDS dose. Fulvic and humic-like fluorophores appeared to be more persistent during UV/H2O2 compared to aromatic protein and soluble microbial product-like fluorophores. In contrast, UV/PDS efficiently degraded all identified fluorophores and showed less selectivity toward the fluorescent EfOM components. Removal pattern of TOrCs during pilot-scale UV/PDS was consistent with lab-scale experiments, however, overall removal rates were lower due to the presence of higher concentration of EfOM and nitrite. 2018 Journal Article http://hdl.handle.net/20.500.11937/73251 10.1016/j.watres.2018.08.052 IWA Publishing restricted |
| spellingShingle | Nihemaiti, M. Miklos, D. Hübner, U. Linden, K. Drewes, J. Croue, Jean-Philippe Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title | Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title_full | Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title_fullStr | Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title_full_unstemmed | Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title_short | Removal of trace organic chemicals in wastewater effluent by UV/H2O2 and UV/PDS |
| title_sort | removal of trace organic chemicals in wastewater effluent by uv/h2o2 and uv/pds |
| url | http://hdl.handle.net/20.500.11937/73251 |