Fixed bed adsorption studies of methyl red using microwave-irradiated coconut shell activated carbon
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Date
2019-06
Authors
Mohamad Hafiz Bin Mohd Rusli
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Abstract
The continuous fixed bed adsorption has been proposed as an effective method for the removal of pollutants from the industrial waste water in industrial applications. The main objective of the study was to investigate the effectiveness of methyl red dye removal by coconut shell activated carbon (CSAC) in fixed-bed column. The influence of important parameters which are feed flow rate (4-10 mL/min), bed height (2-4 cm) and initial dye concentration (20-60 ppm) on the behaviour of the breakthrough curves and adsorption performance was studied. The results indicated that the breakthrough curves were dependent on all the three parameter studied. The breakthroughs time for the adsorption of methyl red dye occur faster at higher flow rate, lower bed height and higher concentration. The highest adsorption capacity was recorded at lowest flow rate, lowest initial concentration and highest bed height which was 0.092 mg/g. Four models which consist of Adams-Bohart, Thomas, MDR and BDST model were used to analyse the performance of the column adsorption. The adsorption capacity, rate constant and non-linear regression coefficient (r2) of each model was calculated. The result shows that Thomas and MDR model fitted well with the adsorption data. It was proven by high r2 (0.98-0.99) and low SSE (0.019-0.0002) obtained by both model. For scale-up of fixed bed adsorption column systems, the total bed height for scale-up of 24 hours breakthrough time is 75.33 cm and it is well-suited for industries that operate for 24 hours. The scale up for diameter based on increasing flowrate shows an acceptable diameter size for industrial purpose which concludes that the scale up for this system is applicable.