Removal of Cr3+ by electrocoagulation with multiple electrodes:: Bipolar and monopolar configurations

被引:118
作者
Golder, A. K. [1 ]
Samanta, A. N. [1 ]
Ray, S. [1 ]
机构
[1] Indian Inst Technol, Dept Chem Engn, Kharagpur 721302, W Bengal, India
关键词
electrocoagulation; bipolar; monopolar; electrode configuration; current efficiency; WASTE-WATER; ALUMINUM ELECTRODES; ELECTROCHEMICAL PRECIPITATION; TANNERY EFFLUENTS; CHROMIUM; ELECTROFLOTATION; DECOLORIZATION; SEPARATION; RECOVERY; CHLORIDE;
D O I
10.1016/j.jhazmat.2006.07.025
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Removal of Cr3+ from aqueous solutions by electrocoagulation (EC) with multiple electrodes was studied with both bipolar and monopolar configurations. The influence of chloride ions, pH, initial Cr3+ concentration and cell current on removal performance was investigated in a batch stirred cell. It was noted that, the enhancement of solubility of Cr(OH)(3) and co-precipitated [Cr, Fe](OH)(3) in presence of chloride ions results in reduction of removal efficiency. Removal of Cr3+ improved at higher pH due to combined effect of precipitation, co-precipitation as solid solution like species, adsorption, cathodic reduction and sweep coagulation. The maximum Cr3+ removal per unit charge loading was found to be increasing with increase in initial Cr3+ concentration. The cell current efficiency was less than that predicted from Faraday's law of electrolysis for both configurations. The operating cost was estimated from the power cost and cost of electrode material. The former was 40% and the later was 43% higher for bipolar configuration compared to monopolar configuration for achieving final chromium discharge limit of 2.0 mg/l. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:653 / 661
页数:9
相关论文
共 29 条
[1]   Operating cost analysis of electrocoagulation of textile dye wastewater [J].
Bayramoglu, M ;
Kobya, M ;
Can, OT ;
Sozbir, M .
SEPARATION AND PURIFICATION TECHNOLOGY, 2004, 37 (02) :117-125
[2]   Children in the digital age [J].
Calvert, SL ;
Jordan, AB .
JOURNAL OF APPLIED DEVELOPMENTAL PSYCHOLOGY, 2001, 22 (01) :3-5
[3]   Decolorization of reactive dye solutions by electrocoagulation using aluminum electrodes [J].
Can, OT ;
Bayramoglu, M ;
Kobya, M .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 2003, 42 (14) :3391-3396
[4]   Treatment of aqueous effluents of the leather industry by membrane processes - A review [J].
Cassano, A ;
Molinari, R ;
Romano, M ;
Drioli, E .
JOURNAL OF MEMBRANE SCIENCE, 2001, 181 (01) :111-126
[5]   Decolorization of orange II by electrocoagulation method [J].
Daneshvar, N ;
Ashassi-Sorkhabi, H ;
Tizpar, A .
SEPARATION AND PURIFICATION TECHNOLOGY, 2003, 31 (02) :153-162
[6]  
Dutta S.S., 1999, An introduction to the principles of Leather manufacture, VFourth
[7]   LOCALIZED CORROSION OF ALUMINUM-ALLOYS - A REVIEW [J].
FOLEY, RT .
CORROSION, 1986, 42 (05) :277-288
[8]   Removal and recovery of Cr(VI) from polluted ground waters:: A comparative study of ion-exchange technologies [J].
Galán, B ;
Castañeda, D ;
Ortiz, I .
WATER RESEARCH, 2005, 39 (18) :4317-4324
[9]   Removal of chromium(VI) from wastewater by combined electrocoagulation-electroflotation without a filter [J].
Gao, P ;
Chen, XM ;
Shen, F ;
Chen, GH .
SEPARATION AND PURIFICATION TECHNOLOGY, 2005, 43 (02) :117-123
[10]   New bipolar electrocoagulation-electroflotation process for the treatment of laundry wastewater [J].
Ge, JT ;
Qu, JH ;
Lei, PJ ;
Liu, HJ .
SEPARATION AND PURIFICATION TECHNOLOGY, 2004, 36 (01) :33-39