Removal of Chromium (Ⅵ) with Zero Valent Iron:an Experimental Research / 环境与健康杂志

ABSTRACT

Objective To observe the removal of Cr(Ⅵ) and effects of some factors in solution on Cr(Ⅵ) with zero valent iron(ZVI).Methods A certain amount ZVI were added in a 50 ml solution with Cr(Ⅵ),the effects on removal ratio were observed when the initial Cr(Ⅵ) concentration was 5,10,20 and 30 mg / L,temperatures was 5,15,25 and 35 ℃,the ZVI dosage was 0.25,0.5,0.75,1.0,1.25 and 1.50 g and anions such as Cl-,NO3-,SO42-,CO32-and PO43-.The removal ratio of Cr(Ⅵ) was evaluated by Cr(Ⅵ) concentration difference pre and post-treatment with ZVI.Results Cr(Ⅵ) could be removed effectively with ZVI and removal ratio of Cr(Ⅵ) could reach over 90% in 5 min,the Cr(Ⅵ) concentration of the solution could meet the requirement of GB5749-2006 Sanitary Standard for Drinking Water Quality [ Cr(Ⅵ) concentration≤0.05 mg/L].The best reaction conditions was 35 ℃,pH=2,dosage of ZVI =1.0 g.Conclusion Cr(Ⅵ) can be removed by ZVI in solution,the removal ratio can be impacted by some factors such as pH value,Cr(Ⅵ) initial concentration,temperature.