Decolorization and COD Removal of Palm Oil Mill Wastewater by Electrocoagulation

The objective of this study is to investigate the performance of the electrocoagulation process for color and COD removal in palm oil wastewater using a 10 L batch reactor. Iron was used as electrodes and the distance between electrodes was 2 cm. The effects of operating parameters: current voltage (6, 12 and 18 volt), reaction time (5, 15, 30, 45 and 60 min) and initial pH (4 and 9) of treatment efficiency were examine. The result showed that decolorization and COD removal efficiency increased with the increase in current voltage and reaction time. The proper condition for decolorization achieved at initial pH 4 and 9 were current voltage of 12 volt, reaction time 30 min. The decolorization efficiency reached 90.4% and 88.9%, respectively. COD removal was achiveved at current voltage 12 volt, reaction time 15 min. COD removal efficiency was 89.2 % and 83.0%, respectively. From the results, to show electrocoagulation process can treat palm oil mill wastewater in both acidic and basic condition at high efficiency for color and COD removal. Consequently, electrocoagulation process can be used or applied as a post-treatment step to improve the quality of the final discharge in term of color and residual COD removal.

• K. Sontaya
• B. Pitiyont
• V. Punsuvon

• COD removal
• decolorizaton
• electrocoagulation
• iron electrode
• palm oil mill wastewater.

[1] K. Gobi, M. D. Mashitah and V. M. Vadivelu.“Development and
utilization of aerobic granules for the palm oil mill (POM)wastewater
treatment” Chemical Engineering Journal,vol.174, pp.213– 220,
Sep.2011.
[2] U. U. Tezcan, S. Ugur, A. S. Koparal and O. U. Bakir.
“Electrocoagulation of olivemill wastewaters” Separation and
Purification Technology, vol.52, pp.136–141, Nov. 2006
[3] G. Mouedhen, M. Feki, M. P. Wery and H. F. Ayedi. “Behavior of
aluminum electrodes in electroco agulation process”Journal of
Hazardous Materials, vol.150, pp.124–135, Jan. 2008.
[4] L. H. andez, D. C. Barrera, G. M. Roa, B. Bilyeu and N. F. Urena.
“Influence of the anodic material on electrocoagulation performance”
Chemical Engineering Journal, vol.148, pp.97 – 105, May. 2009.
[5] A. Bukhari, “Investigation of the electro-coagulation treatment process
for the removal of total suspended solids and turbidity from municipal
wastewater ”Bioresoure Technology, vol.99, pp. 914–921, Mar. (2008)
[6] X. Xu and X. Zhu. “Treatment of refectory oily wastewater by
electrocoagulation process” Chemosphere, vol.56. pp.889 – 894, Sep.
2004.
[7] M. Tir and M. N. Moulai “Optimization of oil removal from oily
wastewater by electrocoagulation using response surface method”
Journal of Hazardous Materials, vol.158, pp.107–115.2008.
[8] F. Hanafi, O. Assobhei, and M. Mountadar,”Detoxificationand
discoloration of Moroccan olive mill wastewater by
electrocoagulation”,Journal of Hazardous Materials, vol.174, pp. 807–
812, Feb. 2010.
[9] O. Yahiaoui, H. Lounici, N. Abdi, N. Drouiche, N. Ghaffour, A.
Pauss, and N. Mameri, “ Treatment of olive mill waste water by the
combination of ultra filtration and bipolar electrochemical reactor
processes” Chemical Engineering and Processing: Process
Intensification, vol.50, pp. 37–41, Jan. 2011.
[10] E. Murat, M. Kirlaroglu, T. S. Aktas and E. Yaksel “The effect of
alternating current electrocoagulation on dye removal from aqueous
solutions” Chemical engineering journal, vol.153, pp.16 – 22, May.
2009.
[11] M. Rebhun and M. Lurie “Control of organic- matter by coagulation
and floc separation” Water Science and Technology, vol.27, pp. 1–20.
1993.
[12] APHA “Standard method for the examination of water and wastewater
“20th edition, 1998.