Dynamic Test of Nitrite Removal by SSI from Wastewater

Abstract:

Spherical sponge iron (SSI) with high activity and intension could be prepared through direct reduction by hydrogen. To investigate the optimized method of nitrate removal from wastewater by SSI, dynamic testing of nitrate removal has been investigated. pH values should be elevated quickly after the addition of SSI, and nitrate removal percentage reached to more than 88% during dynamic state experiment. Nitrate removal expressed two-phase removal process including the nitrate removal percentage increasing phase persistently and the nitrate removal percentage maintaining constant phase. The reduction temperature of SSI has significant influence on nitrate removal during fore-period. When the nitrate concentration was 5mg-N/L, nitrate removal percentage could only amount to 60% even the libration time prolonged to 200h. When the nitrate concentration increased to 50mg-N/L, the nitrate removal concentration increased quickly to about 80% and then the removal percentage maintained about 88%.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 1441-1445
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.1441
• Online since: February 2012
• Authors: Jun Guo Li, Shou Zhang Li, Wei Tian
• Keywords: Dynamic Test, Nitrate, Reduction Temperature, Reduction Time, Removal, Spherical Sponge Iron (SSI)

References

[1] M. Kumar, S. Chakraborty, Chemical denitrification of water by zero-valent magnesium powder. J Hazard. Mater., B135(2006), p.112.

[2] G. C. C. Yang, H. L. Lee, Chemical reduction of nitrate by nanosized iron: kinetics and pathways. Water Res., 39(2005), p.884.

DOI: 10.1016/j.watres.2004.11.030

[3] Y. P. Feng, J. G. Li, N. Bi, X. L. Yan, Static experimental research on nitrate reduction removal from water by spherical sponge iron. Environ. Sci. and Technol., 6(2008), p.14.

[4] S. Choe, H. M. Liljestrand, J. Khim, Nitrate reduction by zero-valent iron under different pH regimes. Applied Geochem., 19(2004), p.335.

DOI: 10.1016/j.apgeochem.2003.08.001

[5] A. Yazdankhah, S. E. Moradi, S. Amirmahmoodi, M. Abbasian, S. E. Shoja, Enhanced sorption of cadmium ion on highly ordered nanoporous carbon by using different surfactant modification. Microporous and Mesoporous Mater., 1(2010), p.35.

DOI: 10.1016/j.micromeso.2010.04.012

[6] S. M. Ponder, J. G. Darab, T. E. Mallouk, Remediation of Cr(VI) and Pb(II) aqueous solutions using supported, nanoscale zero-valent iron. Environ. Sci. Technol., 12 (2000) 2564-2569.

DOI: 10.1021/es9911420

[7] J. G. Li, J. Li, Y. G. Li, Cadmium removal from wastewater by sponge iron sphere prepared by charcoal direct reduction. J. Environ. Sci. suppl (2009), p.60.

DOI: 10.1016/s1001-0742(09)60038-3

[8] J. G. Li, L. H. Wei, Y. G. Li, N. Bi, F. F. Song, Cadmium removal from wastewater by sponge iron sphere prepared by hydrogen reduction. J. Environ. Sci. suppl.(2011), p.114.

DOI: 10.1016/s1001-0742(11)61090-5

[9] Y. R. Wang, J. G. Li, G. J. Zhao, L. X. Xu, Y. T. Li, In situ observations of microstructural and morphological changes of the reduction product of magnetite in H2/Ar gas mixtures. Acta Metall. Sinica. 6 (1998), p.571.