Novel polyaluminum ferric chloride composite coagulant from Bayer red mud for wastewater treatment

Rongrong LuNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433

Yihe ZhangNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433Correspondence[email protected]

Fengshan ZhouNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433

Xinke WangNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433

Qi AnNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433

Zilin MengNational Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China, Tel./Fax: +86 10 82323433

Abstract

A novel composite inorganic polyaluminum ferric chloride (PAFC) coagulant was prepared from Bayer red mud and was usable for wastewater treatment. The reaction parameters affecting the PAFC coagulant performance such as the type of alkali used as the polymerization adjuster, pH, reaction temperature, and reaction time were examined in this study. The structure and morphology of the product were characterized by infrared spectra (FTIR), X-ray diffraction, and scanning electron microscopy. The optimized conditions for preparation were decided as using Ca(AlO₂)₂ and NaOH together as the polymerization adjuster to reach a pH value of 2.47 with the mixture being kept at 80°C for 6 h. Furthermore, the coagulation performance of the PAFC coagulant was tested in real wastewater samples of pretreated oily sewage and printing and dyeing wastewater. The prepared PAFC coagulant outperformed commercially available PAC coagulant.

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Acknowledgments

This research was jointly supported by National High Technology Research and Development Program (863 Program 2012AA06A109) of China, the Fundamental Research Funds for the Central Universities (2010ZD08), the special co-construction project of Beijing city education committee, Doctoral Program Foundation of Institution of higher education of China(2-2-08-07).

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Novel polyaluminum ferric chloride composite coagulant from Bayer red mud for wastewater treatment

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Novel polyaluminum ferric chloride composite coagulant from Bayer red mud for wastewater treatment

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