Decolourization and removal of phenolic compounds from olive mill wastewater by electrocoagulation

Abstract The effective performance of electrocoagulation (EC) technique in the treatment of olive mill wastewater (OMW) has been investigated using sacrificial aluminium electrodes. The optimum working pH was found to be in the range 4–6, allowing OMW to be treated directly without pH adjustment. In addition, it is found that an increase in the current enhanced the speed of the treatment significantly. However, simultaneous increase of electrode and energy consumption was observed. The optimum current density allowing the quickest treatment with a low cost was found to be 75 mA cm −2 . Therefore, a current density of 75 mA cm −2 was selected as an optimum that allows fast and low cost treatment. Application of electrocoagulation procedure permitted high removal efficiencies of pollutants with both fresh and stored olive mill wastewater. The process produces a removal capacity of 76% of COD, 91% of polyphenols and 95% of dark colour, just after 25 min. The electrode consumption was found to be 2.11 kg m −3 of treated OMW. The results show that electrocoagulation could be considered as an effective alternative solution for the treatment of OMW or may be combined with a classical biological process to achieve a high quality effluent water.

[1]  J. Do,et al.  Decolourization of dye-containing solutions by electrocoagulation , 1994 .

[2]  E. A. Vik,et al.  Electrocoagulation of potable water , 1984 .

[3]  J. Rusling,et al.  Dechlorination of polychlorinated biphenyls by electrochemical catalysis in a bicontinuous microemulsion , 1993 .

[4]  Guohua Chen,et al.  Electrochemical removal of fluoride ions from industrial wastewater , 2003 .

[5]  Kamal Al-Malah,et al.  Olive mills effluent (OME) wastewater post-treatment using activated clay , 2000 .

[6]  Geoffrey W. Barton,et al.  A quantitative comparison between chemical dosing and electrocoagulation , 2002 .

[7]  S. Girayvelioglu,et al.  Activated sludge treatability of olive oil-bearing wastewater , 1992 .

[8]  Mahmut Bayramoglu,et al.  Treatment of textile wastewaters by electrocoagulation using iron and aluminum electrodes. , 2003, Journal of hazardous materials.

[9]  M. Hamdi.  Toxicity and biodegradability of olive mill wastewaters in batch anaerobic digestion , 1992 .

[10]  M. Hamdi.  Anaerobic digestion of olive mill wastewaters , 1996 .

[11]  Vincenza Calabrò,et al.  An integrated centrifugation–ultrafiltration system in the treatment of olive mill wastewater , 2002 .

[12]  R. Casa,et al.  Reduction of the phenolic components in olive-mill wastewater by an enzymatic treatment and its impact on durum wheat (Triticum durum Desf.) germinability. , 2003, Chemosphere.

[13]  Custode Scioli,et al.  The use of Yarrowia lipolytica to reduce pollution in olive mill wastewaters , 1997 .

[14]  E. Sánchez,et al.  Comparative effect of different aerobic pretreatments on the kinetics and macroenergetic parameters of anaerobic digestion of olive mill wastewater in continuous mode , 1998 .

[15]  A. Evidente,et al.  Antibacterial polyphenols from olive oil mill waste waters. , 1995, The Journal of applied bacteriology.

[16]  Juana Pérez,et al.  Low molecular weight phenolics attenuation during simulated treatment of wastewaters from olive oil mills in evaporation ponds , 1992 .

[17]  Ponisseril Somasundaran,et al.  Pulsed electrogeneration of bubbles for electroflotation , 1991 .

[18]  N. Blakey,et al.  Influence of Codisposal of Municipal Solid Waste and Olive Vegetation Water on the Anaerobic Digestion of a Sanitary Landfill , 1993 .

[19]  A. Evidente,et al.  Isolation, spectroscopy and selective phytotoxic effects of polyphenols from vegetable waste waters , 1992 .

[20]  F. Bonemazzi,et al.  Interaction between acidogenesis and methanogenesis in the anaerobic treatment of olive oil mill effluents , 1996 .

[21]  L. M. Nieto,et al.  Kinetics of aerobic treatment of olive-mill wastewater (OMW) with Aspergillus terreus , 2002 .

[22]  P. Galiatsatou,et al.  Treatment of olive mill waste water with activated carbons from agricultural by-products. , 2002, Waste management.

[23]  L. Ersoy,et al.  Characterization and lime treatment of olive mill wastewater. , 2001, Water research.

[24]  Guohua Chen,et al.  Separation of pollutants from restaurant wastewater by electrocoagulation , 2000 .

[25]  Leila Jemni Ben Ayed,et al.  Decolorization of fresh and stored-black olive mill wastewaters by Geotrichum candidum , 2002 .

[26]  V. L. Singleton,et al.  Total Phenol Analysis: Automation and Comparison with Manual Methods , 1977, American Journal of Enology and Viticulture.

[27]  Göksel N. Demirer,et al.  Anaerobic treatment of olive mill wastes in batch reactors , 2000 .

[28]  J. L. Acero,et al.  Organic matter removal from wastewaters of the black olive industry by chemical and biological procedures , 2001 .

[29]  J. Beltrán-Heredia,et al.  Treatments of wastewaters from olive oil mills by uv radiation and by combined ozone‐UV radiation , 1997 .

[30]  G. Boari,et al.  Combined treatments of urban and olive mill effluents in Apulia, Italy. , 1990 .