ORIGINAL RESEARCH
Homogeneous Photocatalytic Iron Slag Reduction Cr6+ from Chromium Wastewater Containing High-Salt in Constructed Wetland
Dandan Li 1  
,  
Jianqiu Han 1  
 
 
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College of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai, China
CORRESPONDING AUTHOR
Jianqiu Han   

College of Ecological Technology and Engineering, Shanghai Institute of Technology, 201418 Shanghai, China
Online publish date: 2019-05-19
Submission date: 2018-07-13
Final revision date: 2018-08-22
Acceptance date: 2018-09-03
 
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ABSTRACT
The reductive removal of hexavalent chromium Cr6+ by iron slag from aqueous solutions was investigated. Iron slag was treated with a grinding miller and washed thoroughly. The redox reaction of iron slag onto the chromium Cr6+ was initiated by Fenton’s reagent (Fe2+/H2O2). The optimum conditions for adsorption of Cr6+ were found to be as follows: pH 3; photocatalyst dose 0.13 g/L; COD 400 mg/L; Cl- concentration 5 mg/L; matrix was gravel and construction waste and contact; reaction time was 270 min. In addition, the action mechanism of each factor in the wastewater was analyzed. In the reaction system, pH was the main influencing factor. When the pH was 3, the reduced rate of Cr6+ could reach 99%. High salinity had a certain effect on Cr6+ reduction. When the Cl- concentration was more than 6 mg/L, Cr6+ reduction rate was below 90%. Owing to high efficiency and low cost, iron slag could be used as an effective catalyst for Cr6+ removal from wastewater.
eISSN:2083-5906
ISSN:1230-1485