Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 72, Issue -, Pages 142-148Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2017.01.020
Keywords
Polysilicate-magnesium; Acid medium; Coagulation efficiency; Dyeing wastewater treatment
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Funding
- Foundations of Educational Committee of Anhui Province [KJ2015A181, KJ2015A262, KJ2015A287, KJ2014A130]
- Important Project of Anhui Provincial Education Department [gxyqZD2016229]
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Polysilicate-magnesium (PSM) was prepared with Mg/Si molar ratios of 1.5 by co-polymerization. It is an inorganic polymer coagulant for dyeing wastewater treatment. Acid medium played an important role in the preparation of PSM. In this study, PSMs were prepared using different acids (H2SO4, HCl, HNO3 and H3PO4) as medium, which were denoted as PSM(S), PSM(Cl), PSM(N) and PSM(P) respectively. FTIR, XRD and SEM were used to analyze the structure and morphology of four types of PSM coagulants. The results show that PSM(S) and PSM(N) both have the compact gel network structure, while PSM(CI) and PSM(P) present layer shape structure and scattered small blocky structure respectively. In the coagulation-flocculation process of dyeing wastewater treatment, PSM(S), PSM(CI) and PSM(N) exhibit better coagulation performance compared with PSM(P). With an optimal pH of 12 and a settling time of 20 min, the color removal efficiency of the coagulant of PSM(S) can reach above 94% at a relatively lower coagulant dosage of 4 mg/L, whereas PSM(CI) and PSM(N) brings to about 94% at a higher coagulant dosage of 8 mg/L. However, PSM(P) shows that the highest color removal efficiency reaches only about 63% at a coagulant dosage of 8 mg/L. Therefore, PSM(S) is considered as the best acid modified PSM. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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