The performance of biocarrier containing zinc nanoparticles in biofilm reactor for treating textile wastewater. (November 2018) - Wang, Feng
Graphical abstract: Highlights: The biocarriers containing various weight fraction of zinc nanoparticles were successfully developed. Higher attached active biomass, DHA and abundant microbial community were achieved on the biocarriers. This novel biocarriers containing zinc nanoparticles could enhance textile wastewater treatment in biofilm reactor. Abstract: Zinc (Zn) is a necessary microelement for microorganisms to perform various vital functions, which can influence the diversity of microorganisms and get them involved in pollutant degradation in biological wastewater treatment plant. In this study, a novel biocarrier containing different weight fraction (wt%) of zinc nanoparticles (Zn NPs) (0, 10, 15, 20 and 30 wt%) were developed by mixing and melt compounding technology to deal with textile wastewater (TW). The moving bed biofilm reactor (MBBR) filled with biocarriers containing 20 wt% Zn NPs, with zinc ion release profile of 0.4 mg/L had the best performance. It could shorten the start-up time to 11 d, and had higher attached biomass (2460 mg/L) and biofilm dehydrogenase activity (nearly 350 μg TPF/g). As a result, the removal efficiencies of COD and NH3 -N were higher than reactors filled with other biocarriers. It indicate that the biocarriers containing Zn NPs is expected to increase the metabolic activity of microorganisms and to improve pollutant removal efficiency in the bioflim reactor for TW treatment.