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Separation Science and Technology Volume 47, 2012 - Issue 5
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COAGULATION

Reduction of COD and TSS from Paper Industries Wastewater using Electro-Coagulation and Chemical Coagulation

Mohammad Al-Shannag Department of Chemical Engineering, Faculty of Engineering Technology, Al-Balqa Applied University, Marka, Amman, JordanCorrespondence[email protected]
,
Walid Lafi Department of Chemical Engineering, Faculty of Engineering Technology, Al-Balqa Applied University, Marka, Amman, Jordan
,
Khalid Bani-Melhem Environmental Engineering Program, Faculty of Sciences and Engineering, The American University in Cairo, Cairo, Egypt
,
Fawzi Gharagheer Department of Civil Engineering, College of Engineering, Al-Isra Private University, Amman, Jordan
&
Oqlah Dhaimat Department of Civil Engineering, College of Engineering, Al-Zaytoonah University, Amman, Jordan
Pages 700-708 | Received 03 Apr 2011, Accepted 18 Oct 2011, Published online: 06 Apr 2012
 
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Abstract

The objective of the present study was to investigate experimentally the removal of total suspended solid (TSS) and chemical oxygen demand (COD) of wastewater from paper industries by electro-coagulation techniques solely, or with the aid of chemical flocculants. Electro-coagulation experiments were carried out using iron electrodes and either iron sulphate or calcium carbonate as chemical coagulants. A parametric study including the effect of the type of coagulant, initial pH, current density (CD), circulating flow rate, and electro-coagulation time, on the percent removals of TSS, and COD was considered to explore their role in improving the treatment performance. Without the aid of flocculants, electro-coagulation treatment was able to reduce TSS and COD concentrations up to 80%. In particular, electro-coagulation with the aid of iron sulphate or calcium carbonate as flocculants was found to have the highest removal levels that reach values in the range of 90–97%.

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