Abstract
The continuous rise in production and applications of carbon nanotubes (CNTs) has grown a concern about their fate and toxicity in the environment. After use, these nanomaterials pass through sewage and accumulate in wastewater treatment plants. Since, such plants rely on biological degradation of wastes; their activity may decrease due to the presence of CNTs. This study investigated the effect of multiwalled carbon nanotubes (MWCNTs) on upflow anaerobic sludge blanket (UASB) microbial activity. The toxic effect on microbial viability, extracellular polymeric substances (EPS), volatile fatty acids (VFA), and biogas generation was determined. The reduction in a colony-forming unit (CFU) was 29 and 58 % in 1 and 100 mg/L test samples, respectively, as compared to control. The volatile fatty acids and biogas production was also found reduced. The scanning electron microscopy (SEM) and fluorescent microscopy images confirmed that the MWCNT mediated microbial cell damage. This damage caused the increase in EPS carbohydrate, protein, and DNA concentration. Fourier transform infrared (FTIR) spectroscopy results supported the alterations in sludge EPS due to MWCNT. Our observations offer a new insight to understand the nanotoxic effect of MWCNTs on UASB microflora in a complex environment system.
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Acknowledgments
We thank Chemical Engineering Department, SVNIT, Surat, for providing basic infrastructure for work; MHRD for providing fellowship, Sophisticated Analytical Instrument Facilities, IIT-Bombay, Shree Dhanvantary Pharmacy College, Surat, and Gene care Lab, Surat, for analytical facilities.
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We would like to affirm that the study was carried out at Chemical Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, India. Results consist of a part of our ongoing work and have not been published previously and are not under consideration for publication elsewhere. We also affirm the approval by all authors and tacitly or explicitly by the responsible authorities where the work was carried out, and that, if accepted, it will not be published elsewhere in the same form. No human and/or animal was used as an experimental subject for the present work.
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Yadav, T., Mungray, A.A. & Mungray, A.K. Effect of multiwalled carbon nanotubes on UASB microbial consortium. Environ Sci Pollut Res 23, 4063–4072 (2016). https://doi.org/10.1007/s11356-015-4385-y
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DOI: https://doi.org/10.1007/s11356-015-4385-y