Enhanced Coagulation-Flocculation Performance of Iron-Based Coagulants: Effects of PO4(3-) and SiO3(2-) Modifiers

PloS One
Wei ChenYong Liao

Abstract

PO4(3-) and SiO3(2-) are often used as modifier to improve stability and aggregating ability of the iron-base coagulants, however, there are few reports about their detailed comparison between the coagulation performance and mechanisms. In this study, three coagulants--polyferric phosphoric sulfate (PFPS), polysilicon ferric sulfate (PFSS), and polyferric sulfate (PFS) were synthesized; their structure and morphology were characterized by Fourier transformed infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and Scanning electron microscope (SEM). Alkali titration and Ferron species analysis were employed to investigate the hydrolysis performance and species distribution. Jar test was conducted to measure their coagulation behaviors at different dosage, pH, and temperatures in which the flocs properties were measured. The results showed that a number of new compounds were formed due to the presence of PO4(3-) and SiO3(2-). Moreover, PFPS and PFSS had similar level in Fea as well as Feb. Among them, PFPS produced more multi-core iron atoms polymer and content of Feb, and the formed flocs were larger and denser. It exhibited superior coagulation performance in terms of turbidity reduction, UV254 removal and residual ferric co...Continue Reading

References

Apr 22, 2004·Journal of Zhejiang University. Science·Hai-yan YangChao Ma
Jan 30, 2008·Journal of Hazardous Materials·A I ZouboulisF Vasilakou
Apr 4, 2009·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhen LiangZhenbin Wu
May 22, 2010·Water Science and Technology : a Journal of the International Association on Water Pollution Research·R M WangN P He

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Citations

Dec 19, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Bin XuPeng Dong

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Methods Mentioned

BETA
X-ray
scanning electron microscopy

Software Mentioned

Jade
Pro Plus
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