title: Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw.
abstract: The effect of electrocoagulation treatment was investigated on black liquor from soda-anthraquinone (AQ) pulping of wheat straw. Removal of phenol, chemical oxygen demand (COD), color, total suspended solids (TSS), total dissolved solids (TDS), and total solids (TS) from black liquor was investigated at different current densities by using aluminum electrodes at various electrolysis times (10, 25, 40, 55, and 70 min) and pH levels (3, 5, 7, 9, and 10.5). It was observed that at 16 V, electrolysis time of 55 min and current density of 61.8 mA/cm(2) were sufficient for the removal of the pollutants. Energy consumption was evaluated as an important cost-relation parameter. Results showed that the electrocoagulation treatment reduced color intensity from the high initial value of 18,750 to 220 PCU. This was strongly influenced by the pH level of the wastewater. In addition, it was found that the removal efficiency increased with increasing of current density. The maximum efficiencies for removal were 98.8, 81, 80, 92, 61, and 68 % for color, phenol, COD, TSS, TDS, and TS, respectively. The lowest energy consumption values were obtained at neutral pH after 55 min. Electrocoagulation was found to be an effective, simple, and low-cost technique to treat black liquor.
authors: Department of Wood and Paper Science, Faculty of Natural Resources, Tarbiat Modares University, Noor, Iran.
authors: N
authors: N
authors: Rastegarfar
authors: R
authors: R
authors: Behrooz
authors: N
authors: N
authors: Bahramifar
mesh_terms: D000535:Aluminum / Q000737:chemistry; D000880:Anthraquinones / Q000737:chemistry; D057919:Biological Oxygen Demand Analysis; D003116:Color; D004396:Coloring Agents; D004566:Electrodes; D004784:Environmental Monitoring; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D019800:Phenol / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D010938:Plant Oils; D014908:Triticum; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D007220:Industrial Waste; D010636:Phenols; D010938:Plant Oils; C042834:9,10-anthraquinone; D019800:Phenol; D000535:Aluminum
references: J Hazard Mater. 2003 Jun 27;100(1-3):163-78
references: 12835020
references: J Hazard Mater. 2008 Jan 15;150(1):124-35
references: 17537574
references: J Hazard Mater. 2010 Feb 15;174(1-3):807-12
references: 19880250
references: Bioresour Technol. 2004 Feb;91(3):273-81
references: 14607487
references: Sci Total Environ. 2010 Jan 15;408(4):947-52
references: 19900696
references: J Hazard Mater. 2006 May 20;132(2-3):183-8
references: 16297542
references: J Environ Sci (China). 2013 Jan 1;25(1):220-30
references: 23586318
references: Water Res. 2001 Mar;35(3):745-9
references: 11228973
references: J Hazard Mater. 2009 Apr 30;163(2-3):995-1000
references: 18814966
references: J Hazard Mater. 2001 Jun 1;84(1):29-41
references: 11376882
references: Bioresour Technol. 2007 Nov;98(15):2829-35
references: 17092702
references: J Hazard Mater. 2011 Feb 28;186(2-3):1495-502
references: 21227578
references: Water Sci Technol. 2004;50(3):145-56
references: 15461409
references: J Hazard Mater. 2009 Apr 30;163(2-3):711-6
references: 18755537
references: J Environ Manage. 2008 May;87(3):420-8
references: 17360102
references: J Environ Manage. 2013 Jul 15;123:113-9
references: 23590945