Open Access Peer-reviewed

Removal of Lignin from Wastewater through Electro-Coagulation

Ravi Shankar1, Lovjeet Singh1, Prasenjit Mondal1,, Shri Chand1

1Department of Chemical Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India

World Journal of Environmental Engineering. 2013, 1(2), 16-20. DOI: 10.12691/wjee-1-2-1
Published online: August 25, 2017

Abstract

The present work deals with the removal of lignin (expressed as COD removal) from synthetic wastewater through electro coagulation in a batch reactor using Aluminum as a sacrificial electrode. Effect of various parameters such as current density, pH, NaCl concentration and treatment time on the removal of COD from synthetic wastewater has been investigated to determine the most suitable process conditions for maximum removal of COD (lignin). A central composite design (CCD) has been used to design the experimental conditions for developing mathematical models to correlate the removal efficiency with the process variables. The most suitable conditions for the removal of lignin from synthetic solution were found to be as current density: 100A/m2, pH: 7.6, NaCl concentration: 0.75mg/l and treatment time: 75min. The proposed model gives prediction on COD (lignin) removal with the error limit of around + 9 to - 7%.

Keywords:

electro coagulation, lignin, wastewater, COD, paper and pulp industry
[1]  Garg, A., Mishra, I.M., and Chand, S., “Catalytic wet oxidation of the pretreated synthetic pulp and paper mill effluent under moderate conditions”, Chemosphere, 66(9), 1799-1805. January 2007.View Article  PubMed
 
[2]  Pokhrel, D. and Viraraghavan,T., “Treatment of pulp and paper mill wastewater—a review,” Science of the Total Environment, 333 (1-3). 37-58. October 2004.View Article  PubMed
 
[3]  Kindsigo, M. and Kallas, J., “Degradation of lignins by wet oxidation: model water solutions,” Proc. Estonian Acad. Sci. Chem., 55 (3). 132-144. 2006.
 
[4]  Ceylan, Z., Cana, B.Z. and Kocakerim, M.M., “Boron removal from aqueous solutions by activated carbon impregnated with salicylic acid,” Journal of Hazardous Materials, 152(1). 415-422. March 2008.View Article  PubMed
 
[5]  Katal, R. and Pahlavanzadeh, H, “Influence of different combinations of aluminum and iron electrode on electro coagulation efficiency: Application to the treatment of paper mill wastewater,” Desalination, 265 (1-3). 199-205. January 2011.View Article
 
[6]  Kalyani, K.S.P., Balasubramanian, N. and Srinivasakannan, C, “Decolorization and COD reduction of paper industrial effluent using electro-coagulation,” Chemical Engineering Journal, 151 (1-3). 97-104. August 2009.View Article
 
[7]  Mahesh, S., Prasad, B., Mall, I.D., and Mishra, I.M., “Electrochemical Degradation of Pulp and Paper Mill Wastewater. Part 1. COD and Color Removal,” Industrial & Engineering Chemistry Research, 45 (8). 2830-2839. March 2006.View Article
 
[8]  Sridhar, R., Sivakumar, V., Immanuel, V.P., and Maran, J.P, “Treatment of pulp and paper industry bleaching effluent by electro-coagulant process,” Journal of Hazardous Materials, 186 (2-3), 1495-1502, February 2011.View Article  PubMed
 
[9]  Vepsalainen, M., “Removal of toxic pollutants from pulp mill effluents by electro coagulation,” Separation and Purification Technology, 81 (2). 141-150. September 2011.View Article
 
[10]  Cleceri, L.S., Greenberg, A.E., and Eaton A.D, Standard methods for the examination of water and wastewater, American Public Health Association, USA, Washington DC, 1998, 20th ed.