Effectiveness of zinc oxide-assisted photocatalysis for concerned constituents in reclaimed wastewater: 1,4-Dioxane, trihalomethanes, antibiotics, antibiotic resistant bacteria (ARB), and antibiotic resistance genes (ARGs)
| Autor: | Myung Hwangbo, Sarbajit Banerjee, Theodore E. G. Alivio, Kung-Hui Chu, Everett Caleb Claycomb, Yina Liu |
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| Rok vydání: | 2019 |
| Předmět: |
education.field_of_study
Environmental Engineering 010504 meteorology & atmospheric sciences biology Triclocarban Population 010501 environmental sciences Contamination biology.organism_classification 01 natural sciences Pollution Reclaimed water Triclosan chemistry.chemical_compound Antibiotic resistance chemistry Wastewater Environmental chemistry Environmental Chemistry education Waste Management and Disposal Bacteria 0105 earth and related environmental sciences |
| Zdroj: | Science of The Total Environment. 649:1189-1197 |
| ISSN: | 0048-9697 |
| DOI: | 10.1016/j.scitotenv.2018.08.360 |
| Popis: | Microbial and emerging chemical contaminants are unwanted constituents in reclaimed wastewater, due to the health concerns of using the water for agricultural irrigation, aquifer recharges, and potable water. Removal of these contaminants is required but it is currently challenging, given that there is no simple treatment technology to effectively remove the mixture of these contaminants. This study examined the effectiveness of ZnO-assisted photocatalytic degradation of several constituents, including 1,4-dioxane, trihalomethanes (THMs), triclosan (TCS), triclocarban (TCC), antibiotic resistant bacteria (ARB) and antibiotic resistant genes (ARGs), under low intensity of UV exposure. E. coli with an ARGs-carrying circular plasmid (pUC19) was used as a model antibiotic resistant bacterium. Our results show that commercial zinc oxide (C-ZnO) assisted photodegradation of 1,4-dioxane, and dehalogenation of THMs, TCS, and TCC, while tetrapodal zinc oxide (T-ZnO) enhanced the dehalogenation of TCS and TCC. Additionally, T-ZnO assisted the photocatalytic inactivation of the E. coli within 6 h and caused structural changes in the plasmid DNA (pUC19) with additional UV exposure, resulting in non-functional AGR-containing plasmids. These results also suggest that higher UV dose is required not only to inactivate ARB but also to damage ARGs in the ARB in order to decrease risks in promoting ARB population in the environment. Overall, our results implicated that, under low UV intensity, ZnO-assisted photocatalysis is a promising alternative to simultaneously remove biological and emerging chemical contaminants in treated wastewater for safe reuse. |
| Databáze: | OpenAIRE |
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