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Journal of Engineering and Applied Sciences

Year: 2019  |  Volume: 14  |  Issue: 2  |  Page No.: 405 - 414

Thermally Treated Alum Sludge as Novel Adsorbent of Carbon Dioxide (CO2)

Soleha Mohamat Yusuff, Ong Keat Khim, Wan Mad Zin Wan Yunus, Jahwarhar Izuan Abdul Rashid, Anwar Fitrianto, Mansor Ahmad, Nor Azowa Ibrahim, Syed Mohd Shafiq Syed Ahmad and Chin Chuang Teoh


Dewatered alum sludge from drinking water treatment plants was exploited as carbon dioxide (CO2) adsorbent in a fixed-bed (CO2)lumn system. In this study, the effects of 6 parameters including particle size of adsorbent, heat treatment of adsorbent, adsorbents dosage, adsorption temperature, flow rate of adsorbate and (CO2) ncentration on the fixed-bed adsorption of (CO2) were investigated using Response Surface Methodology 2 2 (RSM). The experimental data was successfully fitted with the regression model to identify the significant parameters and predict the optimum value parameters for maximizing (CO2) adsorption capacity. Analysis of 2 Variance (ANOVA) revealed that (CO2) ncentration was the most significant factor influenced the (CO2) adsorption capacity. The experimental data of (CO2) adsorption capacity were in a good agreement with the 2 predicted data from the regression model. The highest fixed-bed (CO2) adsorption capacity of 10.028 mmol.g 2 –1 (441.24 mg.g–1) was achieved using 1 g of 450-500 μm of 800°C thermally treated alum sludge at (CO2) ncentration of 8000 mg.L–1 with a flow rate of 90 mL.min–1 at 25°C. The results suggested that thermally treated alum sludge is a promising solid adsorbent for (CO2) capture.