期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：227
期号：5
页码：052049
DOI：10.1088/1755-1315/227/5/052049
出版社：IOP Publishing
摘要：In this study, polymeric ferric sulfate (PFS) was employed as a coagulant to treat the wastewater containing Zn(II) and Cr(VI). Based on the mechanism of redox reaction, Cr(VI) was firstly transferred to Cr(III) with the help of (NH4)2Fe(SO4)2) (FAS) as the reductant. Afterwards, the influence of variable factors including FAS dosage, PFS dosage, pH value and settling time on the coagulation-flocculation treatment of the two heavy metals was estimated. The results show that the optimum removal efficiency of Zn(II) was obtained at a PFS dosage of 100 mg/L, pH 7-8 and settling time of 30 minutes. Meanwhile, the removal efficiency of Cr(VI) reached the highest value when the FAS dosage was 1.2 times of theoretical requirement, with the PFS dosage of 20 mg/L, pH 7-8 and settling time of about 30 minutes.
