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Increasing production and wide application of engineered nanoparticles lead to their ultimate release into the environment, thereby contaminating water, air, and soil. Suspended bacteria are ubiquitous in the subsurface and can affect the transport of nanoparticles. This study investigates the fate and transport of zinc oxide nanoparticles (nZnO) in saturated soil in the presence of suspended E. coli through a coupled experimental and modelling approach. E. coli was found to enhance the transport of nZnO. However, E. coli transport was retarded in the presence of nZnO. The difference in the transport behaviour of nZnO and E. coli during the cotransport and individual transport studies is because of the competition between them in finding attachment sites on grain surfaces and also due to the formation of nZnO-E. coli heteroaggregates. The experimental results were successfully simulated using a model which accounted for nZnO and E. coli retention in soil, heteroaggregation kinetics, and heteroaggregate retention in soil.
Keywords: ZnO nanoparticles, bacteria, cotransport, modeling, soil
| References | [1] Jiang, X., Tong, M., Lu, R., & Kim, H. (2012). Transport and deposition of ZnO nanoparticles in saturated porous media. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 401, 29-37. [2] Petosa, A. R., Brennan, S. J., Rajput, F., & Tufenkji, N. (2012). Transport of two metal oxide nanoparticles in saturated granular porous media: role of water chemistry and particle coating. Water research, 46(4), 1273-1285. [3] Xu, N., Cheng, X., Wang, D., Xu, X., Huangfu, X., Li, Z., 2018. Effects of Escherichia coli and phosphate on the transport of titanium dioxide nanoparticles in heterogeneous porous media. Water Res. 146, 264–274. |
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| Country | India |
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