International Science Index


3214

Decontamination of Cr(VI) Polluted Wastewater by use of Low Cost Industrial Wastes

Abstract:The reduction of hexavalent chromium by scrap iron was investigated in continuous system, using long-term column experiments, for aqueous Cr(VI) solutions having low buffering capacities, over the Cr(VI) concentration range of 5 – 40 mg/L. The results showed that the initial Cr(VI) concentration significantly affects the reduction capacity of scrap iron. Maximum reduction capacity of scrap iron was observed at the beginning of the column experiments; the lower the Cr(VI) concentration, the greater the experiment duration with maximum scrap iron reduction capacity. However, due to passivation of active surface, scrap iron reduction capacity continuously decreased in time, especially after Cr(VI) breakthrough. The experimental results showed that highest reduction capacity recorded until Cr(VI) breakthrough was 22.8 mg Cr(VI)/g scrap iron, at CI = 5 mg/L, and decreased with increasing Cr(VI) concentration. In order to assure total reduction of greater Cr(VI) concentrations for a longer period of time, either the mass of scrap iron filling, or the hydraulic retention time should be increased.
References:
[1] J. Barnhart, "Occurrences, uses and properties of chromium," Regul. Toxicol. Pharmacol., vol. 26, 1997, pp. s3-s7.
[2] D. E. Kimbrough, Y. Cohen, and A. M. Winer, "A critical assessment of chromium in the environment," Crit. Rev. Environ. Sci. Technol. vol. 29, 1999, pp. 1-46.
[3] M. Costa, "Potential hazards of hexavalent chromate in our drinking water," Toxicol. Appl. Pharmacol., vol. 188, 2003, pp.1-5.
[4] R. Shrivastava, R. K. Upreti, P. K. Seth, and U. C. Chaturvedi, "Effects of chromium on the immune system," FEMS Immun.Medical Microbiol., vol. 34, 2002, pp. 1-7.
[5] T. J. Naimo, "A review of the effects of heavy metals on freshwater mussels," Ecotoxicol., vol. 4, 1995, pp. 341-362.
[6] D. Bagchi, S. J. Stohs, and B. W. Downs, "Cytotoxicity and oxidative mechanisms of different forms of chromium," Toxicol., vol 180, 2002, pp. 5-22.
[7] M. Cieslak-Golonka, "Toxic and mutagenic effects of chromium(VI). A review," Polyhedron, vol. 15, 1995, pp. 3667-3689.
[8] M. D. Cohen, B. Kargacin, and C. B. Klein, "Mechanisms of chromium carcinogenicity and toxicity," Crit. Rev. Toxicol., vol. 23, 1993, pp. 255- 281.
[9] F. C. Richard, and A. C. M. Bourg, "Aqueous geochemistry of chromium: a review," Wat. Res., vol. 25, 1991, pp. 807-816.
[10] D. Rai, B. M. Sass, and D. A. Moore, "Chromium(III) hydrolysis constants and solubility of chromium(III) hydroxide," Inorg. Chem., vol. 26, 1987, pp. 345-349.
[11] C. Veillon, "Analytical chemistry of chromium". Sci. Total Environ., vol. 86, 1989, pp. 65-68.
[12] M. D. Stearns, M. S. Silveira, and K. K. Wolf, "Chromium(III) tris(picolinate) is mutagenic at the hypoxanthine (guanine) phosphoribosyltransferase locus in Chinese hamster ovary cells," Mutat.Res., vol. 513, 2002, pp. 135-142.
[13] M. Gheju, Chromium and the environment, Timisoara: Politehnica Publishing House, 2005, pp.99-234.
[14] L. E. Eary, and D. Rai, "Chromate removal from aqueous wastes by reduction with ferrous iron," Environ. Sci.Technol., vol. 22, 1988, pp. 972-977.
[15] M. Mullet, S. Boursiquot, J. J. Ehrhardt, "Removal of hexavalent chromium from solutions by mackinawite, tetragonal FeS," Coll. Surf. A: Physicochem. Engineer. Aspects, vol. 244, 2004, pp. 77-85.
[16] R. R. Patterson, S. Fendorf, and M. Fendorf, "Reduction of hexavalent chromium by amorphous iron sulfide," Environ. Sci. Technol., vol. 31, 1997, pp. 2039-2044.
[17] J. Kim, P. K. Jung, H. S. Moon, and C. M. Chon, "Reduction of hexavalent chromium by pyrite-rich andesite in different anionic solutions," Environ. Geol., vol. 42, 2002, pp. 642-648.
[18] J. N. Anderson, B. A. Bolto, and L. A. Pawlowski, "A method for chromate removal from cooling tower blowdown water," Nucl.Chem. Waste Manag., vol. 5, 1984, pp. 125-129.
[19] H.S. Altundogan, A.F. Ozer, and F. Tumen, "A study on the reduction of hexavalent chromium in aqueous solutions by vinasse," Environ. Technol., vol. 25, 2004, pp. 1257-1263.
[20] N. Daneshvar, D. Salari, and S. Aber, "Chromium adsorption and Cr(VI) reduction to trivalent chromium in aqueous solutions by soya cake," J. Hazard. Mater., vol. B97, 2002, pp. 49-61.
[21] M. Gheju, and A. Iovi, "Kinetics of hexavalent chromium reduction by scrap iron," J. Hazard. Mater., vol. B135, 2006, pp. 66-73.
[22] M. Gheju, and R. Pode, "Removal of hexavalent chromium from wastewater by use of scrap iron," International Conference on Energy, Environment, Sustainable Development, Paris, France, June 28-30, 2010, W.A.S.E.T., vol. 66, 2010, pp. 1244-1249.
[23] J. Ye, H. Yin, B. Mai, H. Peng, H. Qin, B. He, and N. Zhang, "Biosorption of chromium from aqueous solution and electroplating wastewater using mixture of Candida lipolytica and dewatered sewage sludge," Biores. Technol., vol. 101, 2010, pp. 3893-3902.
[24] M. Gheju, A. Iovi, and I. Balcu, "Hexavalent chromium reduction with scrap iron in continuous-flow system. Part 1: Effect of feed solution pH," J. Hazard. Mater., vol. 153, 2008, pp. 655-662.
[25] APHA, AWWA, WEF, Standard methods for the examination of water and wastewater, 19th Edition, Baltimore: United Book Press, Inc., 1995, pp. 3.59-3.60.
[26] S.-S. Chen, C.-Y. Cheng, C.-W. Li, P.-H. Chai, and Y.-M. Chang, "Reduction of chromate from electroplating wastewater from pH 1 to 2 using fluidized zero valent iron process," J. Hazard. Mater., vol. 142, 2007, pp. 362-367.
[27] S.-S. Chen, B.-C. Hsu, and L.-W. Hung, "Chromate reduction by waste iron from electroplating wastewater using plug flow reactor," J. Hazard. Mater., vol. 152, 2008, pp. 1092-1097.
[28] L.-Y. Chang, "Chromate reduction in wastewater at different pH levels using thin iron wires - a laboratory study," Environ. Progr., vol 24, 2005, pp. 305-316.
[29] M.A. Olazabal, N. Extebarria, L.A. Fernandez, and J.M. Madariaga, ÔÇ×Study of the complexation and precipitation equilibria in the system Cr(VI)-Fe(III)-H2O," J. Solution Chem., vol. 23, 1994, pp. 1111-1123.
[30] M.A. Olazabal, N.P. Nikolaidis, S.A. Suib, and J.M. Madariaga, "Precipitation equilibria of the chromium(VI)/iron(III) system and spectrospcopic characterization of the precipitates," Environ. Sci. Technol., vol. 31, 1997, 2898-2902.