This present study focused, full factorial design modeling to achieve the optimum treatment conditions on removal of zinc from the industrial wash water. After experimentation, mathematical model for zinc removal was developed to correlate the influences of process parameters and output response. The main & interactive effects of three different experimentally controlled factors were investigated. The contribution percentage of each factor were obtained in the ascending order as Initial Concentration (15.49%) < Current Density (22.19%) < Time (25.29%). The experimental result analysis showed that the combination of higher level of initial concentration and lower levels of both current density and time is essential to achieve maximization of zinc removal rate. ANOVA was used to find out the most significant parameters which affect the response characteristics. Results also show that about 100% of zinc removal can be obtained at optimum conditions.

Electro coagulation, Wash water, FFD, Removal of zinc, ANOVA

[1]. Balasubramanian.N et al., Arsenic Removal from Industrial Effluent through Electrocoagulation. Chemical Engineering & Technology. 24: 519–521, 2001.
[2]. Claudio Escobar et al., Optimization of the electrocoagulation process for the removal of copper, lead and cadmium in natural waters and simulated waste water. Journal of Environmental Management.81: 384-391, 2006.
[3]. Diaz.C.B. et al., Chemical and electrochemical considerations on the removal process of hexavalent chromium from aqueous media. Journal of Applied Electrochemistry. 33:61-71, 2003.
[4]. Do.J.S., et al., Decolourization of dye-containing solutions by electrocoagulation. Journal of Applied Electrochemistry. 24:785–790, 1994.
[5]. Jain.C.K., Application of chemical mass balance to upstream/downstream river monitoring data. Journal of Hydrology. 182:105-115, 1996,.
[6]. Lin, S.H. and F.C. Peng., Treatment of textile wastewater by electrochemical method. Water Research. 28: 277-282, 1994.
[7]. Lin S.H. and F.C. Peng., Continuous treatment of textile wastewater by combined coagulation, electrochemical oxidation and activated sludge. Water Research. 30: 587- 592, 1996.
[8]. Lin, S.H. and M.L Chen. (1997). Treatment of textile wastewater by chemical methods for reuse. Water Research. 31:868- 876.
[9]. Matteson.M. J. et al., Clayfield, Electrocoagulation and separation of aqueous suspensions of ultrafine particles. Colloids and surfaces A: Physiochemical Engineering Aspects. 104:101-109, 1995.
[10]. McClung.S.M. et al., Electrochemical treatment and HPLC analysis of wastewater containing acid dyes. Textile Chemist & Colorist. 26:17–22, 1994.
[11]. Norton.L. et al., Biosorption of zinc from aqueous solutions using bio solids. Advances in Environmental Research. 8:629-635, 2004.
[12]. Ogbonna et al., Application of factorial design of Experiment for Optimization of Inhibition Effect of Acid Extract of Gnetum Africana on copper corrosion. Natural Resources 5:299-307, 2014.
[13]. Ogutveren, U.B. et al., Removal of dye stuffs from waste water: electrocoagulation of acilan blau using soluble anode. Journal of Environmental Science and Health. Part A: Environmental Science and Engineering and toxicology. 27: 1237–1247, 1992.
[14]. Panayotiva.M. et al., Treatment of wastewater from the lead-zinc ore processing industry. Journal of Environmental Science and Health. Part A: Environmental Science and Engineering and toxicology. 31(9):2155-2165, 1996.
[15]. Pouet, M.F. et al., Urban wastewater treatment by electrocoagulation and flotation. Water Science and Technology. 31:275–283, 1995.
[16]. Vik E. A. et al., Electrocoagulation of potable water. Water Research. 18; 1355– 1360, 1984.
[17]. Volesky.B, Detoxification of metal-bearing effluents: Biosorption for the next century. Hydrometallurgy. 59 (2-3): 203-216, 2001.
[18]. Xueming Chen et al., Separation of Pollutants from restaurant wastewater by electro coagulation. Separation and Purification Technology. 19:65-76, 2000.