Electrochemical Corrosion of Steels in Distillery Effluent

Authors: A. K. Singh, Chhotu Ram

Abstract:

The present work relates to the corrosivity of distillery effluent and corrosion performance of mild steel and stainless steels SS304L, SS316L, and 2205. The report presents the results and conclusions drawn on the basis of (i) electrochemical polarization tests performed in distillery effluent and laboratory prepared solutions having composition similar to that of the effluent (ii) the surface examination by scanning electron microscope (SEM) of the corroded steel samples. It is observed that pH and presence of chloride, phosphate, calcium, nitrite and nitrate in distillery effluent enhance corrosion, whereas presence of sulphate and potassium inhibits corrosion. Among the materials tested, mild steel is observed to experience maximum corrosion followed by stainless steels SS304L, SS316L, and 2205.

Keywords: Steel, distillery effluent, electrochemical polarization, corrosion.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1130737

References:

[1] D. Pant and A. Adholeya, “Biological approaches for treatment of distillery wastewater”, Bioresource Technology, vol. 98 pp 2321-2334 (2007).
[2] F.J. Beltran, P.M. Alvarez, E.M. Rodriguez, J.F. Garcia-Araya, and J. Rivas, “Treatment of high strength distillery wastewater (cherry stillage) by integrated aerobic biological oxidation and ozonation”, Biotechnology Progress, vol. 17, pp 462-467, (2001).
[3] J. Thampi and A.B. Pandit, “Rheological properties of concentrated distillery spent wash and some metal corrosion studies”, Indian Journal of Chemical Technology, vol. 6, pp 185-193, (1999).
[4] L. Smuts, “Investigation into the biological removal of sulphate from ethanol distillery wastewater using sulphate reducing prokaryotes”, Rhodes University, Master Thesis, 2004.
[5] A.C. Wilkie, K.J. Riedesel, and J.M. Owens,” Stillage characterization and anaerobic treatment of ethanol stillage from conventional and cellulosic feedstocks”, Biomass and Bioenergy, vol. 19, pp 63-102, (2000).
[6] C. Ram, C. Sharma, and A. K. Singh, Electrochemical corrosion investigation on anaerobic treated distillery effluent”, J. of Materials Engineering and Performance, vol. 23, pp 3321-3327, (2014).
[7] C. Ram, C. Sharma, and A. K. Singh, “In-plant corrosion study of steels in distillery effluent treatment plant”, J. of Material Engineering and Performance, vol. 24, pp 1841-1847, (2015).
[8] “American Society Testing and Material Standard, Corrosion of Metals; Wear and Erosion”, Metal Corrosion Section 3, Vol. 03.02, G1-03, p. 22, (2012).
[9] APHA, “Standard methods for the examination of water and wastewater”, 17th edition, Washington DC, 1989.
[10] P. K. Chaudhari, R. Singh, I. M. Mishra, and S. Chand, “Kinetics of catalytic thermal pretreatment (catalytic thermolysis) of distillery wastewater and bio-digester effluent of alcohol production plant at atmospheric pressure”, Int. J. of Chem. Reactor Engg, vol. 8, pp1-22, (2010).
[11] Y. A. Albrimi, A. Eddib, J. Douch, Y. Berghoute, M. Hamdani, and R. M. Souto, “Electrochemical behaviour of AISI 316 austenitic stainless steel in acidic media containing chloride ions”, Int. J. Electrochem. Sci.,vol. 6, pp 4614-4627, (2011).
[12] M. A. M. Ibrahim, S. S. A. E Rehim, and M. M. Hamza, "Corrosion behaviour of some austenitic stainless steels in chloride environments", Mat. Chem. and Phy., vol. 115, pp 80 - 85, (2009).
[13] P. C. Pistorius and G. T. Burstein, "Growth of corrosion pit on stainless steel in chloride containing dilute sulphate", Corrosion Science, vol. 33, pp 1885-1897, (1992).
[14] G. Kilincceker, B. Yazici, and M. Erbil, "The effect of phosphate ions (PO4−3) on the corrosion of iron in sulphate solutions", Turk J. Chem., vol. 23, pp 41 - 50, (1999).
[15] A. Anejjar, R. Salghi, A. Zarrouk, O. Benali, H. Zarrok, B. Hammouti, and E. E. Ebenso, "Inhibition of carbon steel corrosion in 1 M HCl medium by potassium thiocyanate", J. of the Asso. of Arab Uni. for Basic and App. Sci., (2013) (press).
[16] S. H. Sanad, A. A. Ismail, and N. A. Mahmoud, "Inhibition effect of potassium iodide on corrosion of stainless steel in hydrochloric acid solution", J. of Materials Sci., vol. 27, pp 5706-5712, (1992).
[17] C. Ding, K. Gao, and C. Chen, "Effect of Ca++ on CO2 corrosion properties of X65 pipeline steel", Int. J. Miner. Metall. Mater., vol. 16, pp 661 - 666, (2009).
[18] H. Ma, S. Chen, C. Yang, and J. Luo, "Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions", J. Serb. Chem. Soc., vol. 67, pp 425 - 436, (2002).
[19] L.L. Shreir, R.A. Jarman, and G.T. Burstein, Corrosion- Metal/Environment Reactions, London: Butterworth Heinemann, 1994.
[20] E. Na, J. Ko, and S. Baik, "Electrochemical evaluation of crevice corrosion of 430 ferritic stainless steel using the microcapillary tube technique", Corrosion Science, vol. 186, pp 65 - 74, (2005).
[21] M. Pourbaix, Atlas of Electrochemical Equilibria in Aqueous Solutions, Houston : NACE, 1974, p. 256.
[22] R. F. A. Jargelius-Patterson, "Electrochemical investigation of the influence of nitrogen on the pitting corrosion of austenitic stainless steels", Corrosion Science, vol. 41, pp 1639 - 1664, (1999).
[23] A. Muwila, "The effect of manganese, nitrogen and molybdenum on the corrosion resistance of a low nickel (<2 wt %) austenitic stainless steel", University of the Witwatersrand, Johannesburg, M.Sc Thesis 2006.
[24] R. F.A. Jargelius and T. Wallin, in 10th Scandinavian Corrosion Congress, Stockholm, 1986, p. 161.