Comparison of performance of continuous-flow and batch electrocoagulators: A case study for eliminating reactive blue 21 using iron electrodes
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Author list: Ardhan N., Ruttithiwapanich T., Songkasiri W., Phalakornkule C.
Publisher: Elsevier
Publication year: 2015
Journal: Separation and Purification Technology (1383-5866)
Volume number: 146
Start page: 75
End page: 84
Number of pages: 10
ISSN: 1383-5866
eISSN: 1873-3794
Languages: English-Great Britain (EN-GB)
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Abstract
A batch electrocoagulator was developed for optimal removal of reactive blue 21 from wastewater. The data from the batch reactor were then used to develop a continuous-flow reactor with similar performance for reduction of chemical oxygen demand (COD) and color removal. In the 1.8-L batch system, COD removal of 90% and color removal of 95% were achieved using a current density of 30 A/m2, electrode area of 0.10 m2, and electrocoagulation time of 7 min. The continuous-flow electrocoagulator consisted of two hollow iron tubes put together in a concentric configuration with a working volume of 1.5 L and an effective electrode area of 0.15 m2. By keeping the current density and the applied electric charge the same in both the batch and the continuous-flow systems, the COD and color removals and energy consumption of both systems were the same within 10%. However, the color and COD removals by the batch reactor were higher than those of the continuous-flow electrocoagulator because the distribution of electroactive species in the batch reactor was more effective than that in the tube-in-tube electrocoagulator. ฉ 2015 Elsevier B.V. All rights reserved.
Keywords
Continuous-flow, Electrocoagulator, Reactor design
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