Immobilization of powdery calcium silicate hydrate via PVA covalent cross-linking process for phosphorus removal

The Science of the Total Environment
Shilin DingFangying Ji

Abstract

Calcium silicate hydrate (CSH) is a popular material used for phosphorus removal in recent years. In this work, a novel immobilized material, polyvinyl alcohol-CSH (PVA-CSH), was prepared using a 1:10 weight ratio of CSH powder to 8% PVA solution and then used for phosphorus removal. Samples were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The adsorption mechanism and practical application properties of phosphorus wastewater were studied by sequential batch and continuous flow experiment. The results showed PVA-CSH possessed a porous network structure and an average pore diameter of 24.94 ± 0.11 nm. Furthermore, the CSH functional groups were unaffected by PVA immobilization. Compared with CSH, PVA-CSH did not easily lose CSH after being immobilized by PVA, and the duration of efficient phosphorus removal stage was approximately 20 h longer than that of CSH. In addition, the effluent turbidity of PVA-CSH was 0.11 ± 0.03 NTU during the continuous operation period, which was significantly lower than CSH. In summary, this research study demonstrated the significant potential of PVA-CSH for practical phosphorus...Continue Reading

Citations

Oct 13, 2019·Bioprocess and Biosystems Engineering·Miloš RadosavljevićViktor Nedović
Nov 7, 2019·International Journal of Environmental Research and Public Health·Zizhen ZhouShilei Zhou
Jan 20, 2021·Journal of Environmental Management·Moatlhodi Wise Letshwenyo, Serwalo Mokgosi
Mar 18, 2021·Journal of Hazardous Materials·Kumuduni Niroshika PalansooriyaYong Sik Ok

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