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Water microbial disinfection via supported nAg/Kaolin in a fixed-bed reactor configuration

AuthorsYıldız Ozer, Lütfiye; Yusuf, Ahmed; Uratani, Joao M.; Cabal, Belén ; Díaz, Luis A. ; Torrecillas, Ramón ; Moya, J. S. ; Rodríguez, Jorge; Palmisano, Giovanni
KeywordsWater microbial disinfection
Fixed-bed reactor
Silver nanoparticle
Issue Date2020
CitationApplied Clay Science 184: 105387 (2020)
AbstractIn this paper we have investigated and demonstrated the antimicrobial capabilities of nano-silver-4 wt%-kaolin (nAg-4-Kn) composite supported on borosilicate glass beads (BGB). Tests have been conducted in a fixed bed reactor on effluent from the secondary clarifier of a conventional wastewater treatment plant (WWTP) in Abu Dhabi, United Arab Emirates (UAE). The prepared BGB with immobilized nAg-4-Kn (nAg-4-Kn/BGB) were characterized using the RAMAN spectroscopy, TEM equipped with EDX and Focus Ion Beam Scanning Electron Microscope (FIB-SEM) techniques. The rate of disinfection was assessed through Luria-Bertani (LB)-agar plate cell counting technique. The results showed complete disinfection after few hours, which was preserved even after several days in repeated runs. The nAg-4-Kn/BGB was reused, demonstrating that the immobilization of nAg-4-Kn was stably achieved, and the activity and integrity of the composites on the BGB were preserved. First order disinfection kinetic constants were estimated to be 2.76 cm h−1 and 2.56 cm h−1 in two consecutive runs. Analyses of the beads after the experiments showed minor losses of nAg from the kaolin matrix thereby corroborating reusability of these materials.
Publisher version (URL)https://doi.org/10.1016/j.clay.2019.105387
Appears in Collections:(CINN) Artículos
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