Electrochemical removal of pollutants from agro-industry wastewaters

Abstract Electrocoagulation was investigated for the treatment of agro-industry wastewaters, namely, meat processing, cereal products, food beverages and abattoir. Initial studies were carried out to check the performance of each of the agro-industry wastewaters (in terms of COD removal). The total cost (including, electrical power consumed, chemicals and consumption of electrodes) of the treatment varied between $ 0.95 and 4.93 m−3. Abattoir wastewater resulted in higher COD removal of 85–86%. Subsequent studies were performed in details on the selected abattoir wastewater. Bipolar mild steel electrode gave higher soluble COD removal (82%). Likewise, percent soluble COD removal as a function of pH and conductivity confirmed no need of acidification and electrolyte addition. The coupling of electrocoagulation with flocculation process resulted in effective removal of organics (82% total COD removal), inorganics (with the exception of nitrogen), pathogen destruction and solids and turbidity removal. Thus, electrocoagulation–flocculation process can be envisaged as an effective treatment process for decontamination of agro-industry wastewaters.

[1]  I F Saur,et al.  Electroflocculation : Removal of oil, heavy metals and organic compounds from oil-in-water emulsions , 1996 .

[2]  Mohammad Y A Mollah,et al.  Fundamentals, present and future perspectives of electrocoagulation. , 2004, Journal of hazardous materials.

[3]  Geoffrey W Barton,et al.  The future for electrocoagulation as a localised water treatment technology. , 2005, Chemosphere.

[4]  A. P. Vanerkar,et al.  Conventional Approach for Abattoir Wastewater Treatment , 2005, Environmental technology.

[5]  W. Phutdhawong,et al.  Electrocoagulation and Subsequent Recovery of Phenolic Compounds , 2000 .

[6]  C. F. Seyfried,et al.  UASB-reactor in the fruit juice industry , 1997 .

[7]  F. Edwards,et al.  Electrolytic Treatment of an Industrial Wastewater from a Hosiery Plant , 2006, Water environment research : a research publication of the Water Environment Federation.

[8]  J. Blais,et al.  Pilot‐Plant Study of Wastewater Sludge Decontamination Using a Ferrous Sulfate Bioleaching Process , 2006, Water environment research : a research publication of the Water Environment Federation.

[9]  H. D. Janke,et al.  Biological treatment of wastewater from fruit juice production using a membrane bioreactor: parameters limiting membrane performance , 2003 .

[10]  Xinhua Xu,et al.  Treatment of refectory oily wastewater by electro-coagulation process. , 2004, Chemosphere.

[11]  Guohua Chen.  Electrochemical technologies in wastewater treatment , 2004 .

[12]  M Karpuzcu,et al.  Purification of agro-industrial wastewater from the grease-protein mixture by means of electroflotocoagulation. , 2002, Water science and technology : a journal of the International Association on Water Pollution Research.

[13]  A. Samanta,et al.  Electrocoagulation of methylene blue and eosin yellowish using mild steel electrodes. , 2005, Journal of hazardous materials.

[14]  Efstratios N. Pistikopoulos,et al.  A mathematical model for the optimal design and operation of an anaerobic co-digestion plant , 1996 .

[15]  Krishnan Rajeshwar,et al.  Environmental Electrochemistry: Fundamentals and Applications in Pollution Abatement , 1997 .

[16]  N. Brandon,et al.  Laboratory study of electro-coagulation-flotation for water treatment. , 2002, Water research.

[17]  Po Lock Yue,et al.  Electrocoagulation and Electroflotation of Restaurant Wastewater , 2000 .

[18]  F. Lapicque,et al.  An electrocoagulation unit for the purification of soluble oil wastes of high COD , 2003 .

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

[20]  M Y Mollah,et al.  Electrocoagulation (EC)--science and applications. , 2001, Journal of hazardous materials.

[21]  Nihal Bektaş,et al.  Removal of phosphate from aqueous solutions by electro-coagulation. , 2004, Journal of hazardous materials.

[22]  L. Szpyrkowicz.  Hydrodynamic Effects on the Performance of Electro-coagulation/Electro-flotation for the Removal of Dyes from Textile Wastewater , 2005 .