Preparation of polyaluminium chloride and polyaluminum ferric chloride chemical coagulants for water treatment and comparison of their efficiency with commercial sample

Subject Areas :

akbar rostami vartooni ¹ (استادیار شیمی معدنی گروه شیمی، دانشکده علوم پایه، دانشگاه قم، قم، ایران)
Ali Reza Moradzadeh Aghbalagh ² (Master of Science (M.Sc), Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran)
Ali Shaker ³ (PhD Student of Polymer Engineering, Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran)

Received: 2021-04-08 Accepted : 2021-07-08 Published : 2022-02-20

Keywords: Coagulation, Polymeric coagulants, Water and wastewater treatment, Polyaluminium chloride, Polymaluminum ferric chloride,

Abstract :

In this research, due to the practical and economic advantages of aluminum-based coagulants, the polyaluminum chloride and polyaluminum ferric chloride samples were synthesized using a simple and low-cost method. The prepared polymers were characterized by Fourier-transform infrared spectroscopy, X-ray fluorescence spectroscopy, field-emission scanning electron microscopy, and energy dispersive X-ray spectroscopy. Based on infrared spectroscopy analysis, it is determined that the structural property of the synthesized polymers is similar to that of commercial coagulant. The peaks related to asymmetric stretching vibrations of the Fe-OH-Fe or Al-OH-Al bonds and bending vibration of the Fe-OH bond can be appeared in the range of 1030-1130 cm-1 and 770 cm-1, respectively. The Al, Cl, O and Fe elements are seen in iron-containing samples Finally, the performance of polymeric coagulants in the flocculation process of water purification was investigated by the jar test apparatus. The obtained results showed that the PAC sample has a better coagulation ability and the iron-containing coagulants play a more appropriate role at higher turbidity.

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