Impact of Silica Nanoparticles on the Heterotrophic Denitrification

Abstract:

Silica nanoparticles (Si NPs) have a wide range of uses in semiconductors, battery cathode material, and high power laser source materials. However, Si NPs would flow into the wastewater treatment inevitably, and then potentially harmful interactions can occur between nanoparticles and wastewater systems, especially in denitrification process. The present study was aimed to investigate the effects of Si NPs on nitrate nitrogen removal under anaerobic conditions by employing activated sludge. Our data demonstrates that Si NPs had positive effects on denitrification at the beginning and did not display any measurable effect on nitrite nitrogen removal at the concentration of 100 mg/L and below. The denitrification process was elucidated by using the first-order reaction kinetics equation. This study provided useful data for understanding the effects of Si NPs on wastewater treatment.

• Periodical: Advanced Materials Research (Volumes 955-959)
• Pages: 175-179
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.955-959.175
• Online since: June 2014
• Authors: Lin Ying, Li Na, Yu Yang Zhou, Yin Jun*
• Keywords: Denitrification, Kinetic Equation, NAR, NIR, Si NPs

References

[1] Bystrzejewska-Piotrowska G, Golimowski J, Urban P L. Nanoparticles: their potential toxicity, waste and environmental management[J]. Waste Management, 2009, 29(9): 2587-2595.

DOI: 10.1016/j.wasman.2009.04.001

[2] Brar S K, Verma M, Tyagi R D, et al. Engineered nanoparticles in wastewater and wastewater sludge–evidence and impacts[J]. Waste Management, 2010, 30(3): 504-520.

DOI: 10.1016/j.wasman.2009.10.012

[3] Franklin N M, Rogers N J, Apte S C, et al. Comparative toxicity of nanoparticulateZnO, bulk ZnO, and ZnCl2 to a freshwater microalga (Pseudokirchneriellasubcapitata): the importance of particle solubility[J]. Environmental Science & Technology, 2007, 41(24): 8484-8490.

DOI: 10.1021/es071445r

[4] Limbach L K, Wick P, Manser P, et al. Exposure of engineered nanoparticles to human lung epithelial cells: influence of chemical composition and catalytic activity on oxidative stress[J]. Environmental Science & Technology, 2007, 41(11): 4158-4163.

DOI: 10.1021/es062629t

[5] Kissinger H E. Reaction kinetics in differential thermal analysis[J]. Analytical chemistry, 1957, 29(11): 1702-1706.

DOI: 10.1021/ac60131a045

[6] Standard Methods for the Examination of Water and Wastewater, 20th ed.; American Public Health Association (APHA), American Water Works Association, and Water Environment Federation: Washington, DC, (1998).

DOI: 10.1002/j.1551-8833.1932.tb18153.x

[7] Zheng, X.; Wu, R.; Chen, Y. Effects of ZnO nanoparticles on wastewater biological nitrogen and phosphorus removal. Environ. Sci. Technol. 2011, 45, 2826−2832.

DOI: 10.1021/es2000744

[8] Zhu, X.; Chen, Y.; Chen, H.; Li, X.; Peng, Y.; Wang, S. Minimizing nitrous oxide in biological nutrient removal from municipal wastewater by controlling copper ion concentrations. Appl. Microbiol. Biotechnol. 2012, DOI: 10. 1007/s00253-012-3988-1.

DOI: 10.1007/s00253-012-3988-1

[9] Guo Y G, Hu J S, Wan L J. Nanostructured materials for electrochemical energy conversion and storage devices[J]. Advanced Materials, 2008, 20(15): 2878-2887.

DOI: 10.1002/adma.200800627

[10] Hamidpour M, Kalbasi M, Afyuni M, et al. Sorption hysteresis of Cd (II) and Pb (II) on natural zeolite and bentonite[J]. Journal of hazardous materials, 2010, 181(1): 686-691.

DOI: 10.1016/j.jhazmat.2010.05.067