Journal
CHEMICAL ENGINEERING JOURNAL
Volume 400, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.125953
Keywords
Swine wastewater; Antibiotic resistance genes; Nanoscale copper; Iron-copper bimetallic system
Categories
Funding
- National Natural Science Foundation of China [31972613]
- China Agriculture Research System [CARS-35]
- Sichuan Science and Technology Program [2016JY0154]
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In this study, a distinct type of nanoscale copper, produced by iron-copper replacement (mFe/nCu), was used to reduce ARGs from post-treated swine wastewater. The effects of several key parameters (i. e., theoretical Cu mass loadings, mFe/nCu dosage, air flow rate, initial pH and temperature) were investigated in details. The contribution of nanoscale copper in mFe/nCu system towards ARGs removal was determined. Furthermore, the removal mechanism of ARGs by mFe/nCu was examined by SEM, TEM and living/dead cell staining. Results indicate that the mFe/nCu process can promptly remove the absolute abundances of ARGs (>2.4 logs) from posttreated swine wastewater. The outstanding performance of this approach could be attributed to the use of nanoscale copper itself rather than the oxidation by Fenton-like reaction of mFe/nCu bimetallic system. Moreover, the mFe/nCu process exhibited an excellent activity in regards bacterial killing and destruction of ARGs structure and function which, ultimately, could serve as a plausible mechanism of ARGs removal. Reactivation experiments showed that ARGs removal by mFe/nCu was permanent and irreversible. Altogether, our findings suggest that mFe/nCu treatment can be a promising advanced method for ARGs removal from posttreated swine wastewater.
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