Abstract
The present work is intended to develop a fat extraction method from the limed fleshings for soap production. In leather processing, just after washing, following the liming process, swollen pelts (lime treated hide/skin) have to pass through an operation to remove the remaining fat and flesh from the flesh side in order to improve the diffusion of chemicals into pelt is known as fleshing. Fleshing is the indispensable mechanical operations in leather processing where substantial amounts of inevitable solid waste (termed as fleshings) are produced. Generally, fleshings are kept indiscriminately nearly the industrial area as green, which has negative effects on the environment including human health. It contains a considerable amount of fat, which could be a great source for soap production. To extract fat, firstly collected cowhide fleshings were delimed with boric acid and hydrochloric acid for 5–6 h. The delimed fleshings were heated in a water bath to separate fat from its structure. The optimized extraction conditions were: temperature 75 °C; time 3 h; without agitation. It was estimated that 6.2 % (dry weight) fat was extractable and yearly 638.6 MT fat could be extracted only from the cowhide fleshings in Bangladesh. Finally, soap was prepared from the extracted fat by saponification using sodium hydroxide. The soap was soluble in distilled water, which has good lathering and cleansing power. The process could be optimized for large-scale production, which would be allowed to produce a new product for the commercial use. The approach could also contribute a significant reduction in the environmental impact of inevitable solid waste and decrease the costs associated with disposal.
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References
Hashem, M.A., Nur-A-Tomal, M.S.: Fabrication of composite from leather buffing dust for using in footwear and leather products industry. In: Proceedings of the 3rd International Leather Engineering Congress: Innovative Aspects for Leather Industry (IAFLI 2015), Izmir, Turkey, 21–22 May (2015)
http://www.daily-sun.com/printversion/details/167472/Footwear-exports-record-impressive-growth
Ministry of Environment & Forests (MoEF), The Environment Conservation Rules. Government of the People’s Republic of Bangladesh, Dhaka (1997)
Wieczorek-Ciurowa, K., Famielec, S., Fela, K.: The process of waste incineration in the tanning industry. CHEMIK 65, 917–922 (2011)
Boopathy, R., Karthikeyan, S., Mandal, A., Sekaran, G.: Characterisation and recovery of sodium chloride from salt-laden solid waste generated from leather industry. Clean Technol. Environ. Policy 15, 117–124 (2013)
Accountants and Business Advisers, Technical report: leather sector includes a value chain analysis and proposed action plans. Bangladesh INSPIRED, Dhaka (2013)
Jian, S., Wenyi, T., Wuyong, C.: Kinetics of enzymatic unhairing by protease in leather industry. J. Clean. Prod. 19, 325–331 (2011)
Kanagaraj, J., Velappan, K.C., Chandra Babu, N.K., Sadulla, S.: Solid wastes generation in the leather industry and its utilization for cleaner environment—a review. J. Sci. Ind. Res. 65, 541–548 (2006)
Hashem, M.A., Nur-A-Tomal, M.S., Mondal, B.K.: Generation of fleshings at beamhouse in tannery and its environmental impact assessment: Bangladesh perspective. Bangladesh J. Sci. Ind. Res. 50, 227–232 (2015)
Shanmugam, P., Horan, N.J.: Optimising the biogas production from leather fleshing waste by co-digestion with MSW. Biores. Technol. 100, 4117–4120 (2009)
Lupo, R.: Fleshing treatment and compacting. In: Proceedings of the IULTCS II. Euro Congress, Istanbul, Turkey, May 24–27 (2006)
Rai, A.K., General, T., Bhaskar, N., Suresh, P.V., Sakhare, P.Z., Halami, P.M., Gowda, L.R., Mahendrakar, N.S.: Utilization of tannery fleshings: optimization of conditions for fermenting delimed tannery fleshings using Enterococcus faecium HAB01 by response surface methodology. Bioresour. Technol. 101, 1885–1891 (2010)
Rvindran, B., Sekaran, G.: Bacterial composting of animal fleshing generated from tannery industries. Waste Manag 30, 2622–2630 (2010)
Ravindranath, E., Kalyanaraman, C., Begum, S.S., Gopalakrishnan, A.N.: Effect of recirculation rate on anaerobic treatment of fleshing using UASB reactor with recovery of energy. J. Sci. Ind. Res. 69, 790–793 (2010)
Çolak, S., Zengin, G., Özgünay, H., Sari, Ö.: Utilisation of leather industry prefleshings in biodiesel production. J. Am. Leather Chem. Assoc. 100, 137–141 (2005)
Crispim, A., Sampaio, A., Ramalho, E., Ramos, L., Caetano, N.S., Silva, P.C., Fernandes, R.: Biodiesel from fleshings. J. Soc. Leather Technol. Chem. 94(1), 39–41 (2010)
Šanek, L., Pecha, J., Kolomaznik, K., Barinova, M.: Biodiesel production from tannery fleshings: feedstock pretreatment and process modeling. Fuel 148, 16–24 (2015)
Perwitasari, D.S.: Utilization of solid waste leather industry as raw material making soap. J. Tek. Kimia. 5(2), 425–428 (2011)
Carpenter, C.: Determination of fat content. In: Nielsen, S.S. (ed.) Food Analysis Laboratory Manual, pp. 29–37. Springer, New York (2010)
Donkor, P.: Small-Scale Soapmaking: A Handbook. Intermediate Technology Publications Ltd., London (1986)
Sibanda, N.R., Nyathi, J.A., Ndlovu, L.N.: Chemical properties of jatropha soap and its effects on reactive dyed cotton fabrics as compared to commercial soaps. Zimb. J. Sci. Technol. 8, 1–9 (2013)
Getahun, E., Gabiyye, N.: Experimental investigation and characterization of biodiesel production from leather industry fleshing wastes. Int. J. Renew. Sustain. Energy 2(3), 120–129 (2013)
Bragança, I., Crispim, A., Sampaio, A., Ramalho, E., Crispim, F., Caetano, N.S., Silva, P.C.: Adding value to tannery fleshings: part I–oils and protein hydrolysates. Prod. Appl. 97, 62–67 (2013)
Cork, M.J., Danby, S., Vasilopoulos, Y., Moustafa, M., MacGowan, A., Varghese, J., Duff, G.W., Tazi-Ahnini, R., Ward, S.J.: Epidermal barrier dysfunction in atopic dermatitis. In: Reitamo, S., Luger, T.A., Steinhoff, M. (eds.) Textbook of Atopic Dermatitis, pp. 35–57. Informa Healthcare, London (2008)
Mendes, B.R., Shimabukuro, D.M., Uber, M., Abagge, K.T.: Critical assessment of the pH of children’s soap. J. Pediatr. 92(3), 290–295 (2016)
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Abul Hashem, M., Shahruk Nur-A-Tomal, M. Valorization of Tannery Limed Fleshings Through Fat Extraction: An Approach to Utilize By-Product. Waste Biomass Valor 8, 1219–1224 (2017). https://doi.org/10.1007/s12649-016-9705-z
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DOI: https://doi.org/10.1007/s12649-016-9705-z