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Removal of arsenic from water by electrocoagulation

DSpace at IIT Bombay

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Field Value
 
Title Removal of arsenic from water by electrocoagulation
 
Creator RATNA KUMAR, P
CHAUDHARI, SANJEEV
KHILAR, KC
MAHAJAN, SP
 
Subject adsorption
coagulation
complexation
current density
 
Description In the present study electrocoagulation (EC) has been evaluated as a treatment technology for arsenite [As(III)] and arsenate [As(V)] removal from water. Laboratory scale experiments were conducted with three electrode materials namely, iron, aluminum and titanium to assess their efficiency. Arsenic removal obtained was highest with iron electrodes. EC was able to bring down aqueous phase arsenic concentration to less than 10 μgl-1 with iron electrodes. Current density was varied from 0.65 to 1.53 mAcm -2 and it was observed that higher current density achieved rapid arsenic removal. Experimental results at different current densities indicated that arsenic removal was normalized with respect to total charge passed and therefore charge density has been used to compare the results. Effect of pH on arsenic removal was not significant in the pH range 6-8. Comparative evaluation of As(III) and As(V) removal by chemical coagulation (with ferric chloride) and electrocoagulation has been done. The comparison revealed that EC has better removal efficiency for As(III), whereas As(V) removal by both processes was nearly same. The removal mechanism of As(III) by EC seems to be oxidation of As(III) to As(V) and subsequent removal by adsorption/complexation with metal hydroxides generated in the process.
 
Publisher Elsevier
 
Date 2009-02-17T12:08:12Z
2011-11-25T17:07:56Z
2011-12-26T13:06:03Z
2011-12-27T05:52:05Z
2009-02-17T12:08:12Z
2011-11-25T17:07:56Z
2011-12-26T13:06:03Z
2011-12-27T05:52:05Z
2004
 
Type Article
 
Identifier Chemosphere 55(9), 1245-1252
0045-6535
http://dx.doi.org/10.1016/j.chemosphere.2003.12.025
http://hdl.handle.net/10054/676
http://dspace.library.iitb.ac.in/xmlui/handle/10054/676
 
Language en