Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31168
Treatment of Tannery Effluents by the Process of Coagulation

Authors: G. Shegani

Abstract:

Coagulation is a process that sanitizes leather effluents. It aims to reduce pollutants such as Chemical Oxygen Demand (COD), chloride, sulfate, chromium, suspended solids, and other dissolved solids. The current study aimed to evaluate coagulation efficiency of tannery wastewater by analyzing the change in organic matter, odor, color, ammonium ions, nutrients, chloride, H2S, sulfate, suspended solids, total dissolved solids, fecal pollution, and chromium hexavalent before and after treatment. Effluent samples were treated with coagulants Ca(OH)2 and FeSO4 .7H2O. The best advantages of this treatment included the removal of: COD (81.60%); ammonia ions (98.34%); nitrate ions (92%); chromium hexavalent (75.00%); phosphate (70.00%); chloride (69.20%); and H₂S (50%). Results also indicated a high level of efficiency in the reduction of fecal pollution indicators. Unfortunately, only a modest reduction of sulfate (19.00%) and TSS (13.00%) and an increase in TDS (15.60%) was observed. 

Keywords: treatment, Coagulation, effluent, tannery

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1091794

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3733

References:


[1] UNIDO, "Introduction to treatment of tannery effluents”, Vienna, 2011, pp. 7-11, 18-21, 31-32.
[2] M. A. Aboulhasan, S. Souabi, A. Yaacoubi, "Pollution reduction and biodegradability index improvement of tannery effluents”, Int. J. Sci. Tech., vol. 5(1), pp. 11- 16, Winter 2008.
[3] M. A. Sabur, M. M. Rahman, and S. Safiullah, " Treatment of tannery effluent by locally available commercial grade lime”, Journal of Scientific Research, vol. 5(1), pp.143-150, 2013.
[4] M. Chowdhurya, M.G. Mostafaa, T. K. Biswasb, and A. K. Sahac, "Treatment of leather industrial effluents by filtration and coagulation process”, Elsevier, Water Resources and Industry, vol. 3, pp. 11-22, September 2013.
[5] M. Mwinyihija, "Pollution control and remediation of the tanning effluent”, The Open Environmental Pollution & Toxicology Journal, vol.3, pp. 55-64, 2012.
[6] G. R. Nabi Bidhendi, A. Torabian, H. Ehsani, N. Razmkhah, "Evaluation of industrial dyeing wastewater treatment with coagulants and polyelectrolyte as a coagulant aid”, Iran J. Environ. Health. Sci. Eng.,” vol. 4, no.1, pp. 29-36, 2007.
[7] K . A. Parmar, S. Prajapati, R. Patel, and Y. Dabhi, "Effective use of ferrous sulfate and alum as a coagulant in treatment of dairy industry wastewater”, ARPN Journal of Engineering and Applied Sciences, vol. 6, no. 9, pp. 42-45, September 2011.
[8] A. K. Verma, P. Bhunia, and R. R. Dash, "Supremacy of Magnesium Chloride for decolourisation of textile wastewater: A comparative study on the use of different coagulants”, International Journal of Environmental Science and Development, vol. 3, no. 2, pp. 118-123, April 2012.
[9] UNIDO, "Pollutants in tannery effluents”, Regional Programme for Pollution Control in the Tanning Industry in South-East Asia, pp. 3-13, 9 August 2000, ch.1.
[10] Coagulant Chemicals, http://water.me.vccs.edu/concepts/ coagulantchemicals.html
[11] Coagulation and Flocculation Process Fundamentals, http://www.mrwa.com/OP-Coagulation.pdf
[12] Sludge Volume Index, http://www.norweco.com/html/lab/ test_methods/2710dfp.htm
[13] Ministry of Environment, Forests and Waters, Decision of Counsel of Ministers, " Permissible values of Liquid Discharges and the Criteria for Receiving Water Bodies”, no.177, Appendix 3, 31May 2005, http://www.moe.gov.al/index.php
[14] International Finance Corporation, "Environmental, Health, and Safety Guidelines, Tanning and leather Finishing”, 30 April 2007, http://www.miga.org/documents/TanningandLeatherFinishing.pdf
[15] A. Schjolden, "Leather tanning in India: Environmental regulations and firms´ compliance”, F.I.L. Working Papers, no.21, pp. 30, 2000.
[16] The Environmental impact of the animal product processing industries, pp.1-11, http://www.fao.org/wairdocs/lead/x6114e/x6114e03.htm
[17] Comparing Ferric Sulfate with Ferrous Sulfate for Wastewater Treatment, Technical Bulletin: Wastewater, www.GeneralChemical.com