Organic and Inorganic Matter Removal Using High Polymeric Al13 Containing Polyaluminium Chloride
2020
Zakaria, Zainul Akmar | Ahmad, Wan Azlina
The ability of locally laboratory-synthesized polyaluminium chloride (PAC) with high Al₁₃ content (PAC-Al₁₃) to remove organic, inorganic matter and colour from potable water, agricultural and electroplating wastewaters was evaluated relative to commercial PAC (PACI). PAC-Al₁₃ used in this study was prepared using batch titration of NaOH into AlCl₃·6H₂O solution under vigorous stirring as opposed to the conventional slow-base titration method. The highly pure PAC-Al₁₃ (containing 79% polymeric Al₁₃ species) with high basicity (87%) was isolated and extracted using the sulphate displacement method and metathesis reaction. PAC-Al₁₃ showed higher COD (85–96%), metals (95–100%), TDS (86–90%) and colour (90–95%) removal compared with PACI, i.e. COD (57–74%), metals (71–99%), TDS (58–80%) and colour (85–92%). The dominance of polymeric Al₁₃ species in PAC-Al₁₃ was supported from the scanning electron microscopy images (presence of Keggin structure of Al₁₃) and the ²⁷Al nuclear magnetic resonance analysis that showed the appearance of a single peak at 62.1 ppm. This study demonstrated the potential of using a new type of PAC, produced using simple preparation technique and contain high polymeric Al₁₃ species, that has the ability to remove contaminants from water and wastewater systems more efficiently.
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