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Investigation of the efficiency of removing turbidity, aluminium, and total organic compounds by using poly-aluminium chloride and chitosan from the water of Karoon River, Iran

This study was conducted with the aim of investigating the efficiency of chitosan in improving the performance of poly-aluminum chloride in removing turbidity, aluminum, and organic compounds, including total organic carbon (TOC) and UV254 (absorption of organic compounds by ultraviolet radiation as the wavelength of 254 nm), within the stage of slow mixing of drinking water. This research was conducted on the laboratory scale using a jar test device at the water treatment plant in Ahvaz. The optimal dose of poly-aluminum chloride, together with chitosan, was obtained as 5 and 0.02 mg/L, respectively. The efficiency of the removal of turbidity, TOC, and aluminum, and the absorption of organic compounds by the ultraviolet radiation of a wavelength of 254 nm under optimal conditions of the performance of chitosan, were achieved as 96.59%, 46.15%, 80.49%, and 67.86%, respectively. The governing mechanism for destabilizing colloid particles and removing natural organic compounds can be justified through bridging between the particles—polymers— neutralization of the charge of colloid natural organic compounds, and joint deposition mechanism through adsorption. In addition, the flocs developed by chitosan are larger as they possess greater molecular weight, thereby requiring less time for the deposition.