Adsorption of methylene blue from aqueous solution using tea waste in a continuous stirred tank reactor (cstr)

• Main Author: Ahmad Shafiq, Hashim
• Format: Undergraduates Project Papers
• Language: English
• Published: 2014
• Subjects: TP Chemical technology
• Online Access: http://umpir.ump.edu.my/id/eprint/9003/1/12.Adsorption%20of%20methylene%20blue%20from%20aqueous%20solution%20using%20tea%20waste%20in%20a%20continuous%20stirred%20tank%20reactor%20%28cstr%29.pdf; http://umpir.ump.edu.my/id/eprint/9003/
• Institution: Universiti Malaysia Pahang Al-Sultan Abdullah

In these past few decades, huge numbers of technologies have been developed for wastewater treatment. The scale of these technologies is also very diverse, from a basic aeration pond, to a more sophisticated nanotechnology based treatment system. In this research, dye removal from aqueous solution by adsorption was studied in batch and continuous mode. The main objective of this study was to develop a continuous stirred tank reactor (CSTR) type adsorption unit for continuous dye removal from aqueous solution. The investigated parameters are the effect of adsorbent dose, and residence time on the performance of CSTR in treating synthetic Methylene Blue (MB) wastewater by using tea waste (TW). The equilibrium batch and kinetic study has been performed to characterize the adsorbent-adsorbate system. For the CSTR adsorption test, the adsorbent was added at suitable time intervals while the residence time and adsorbent dosage is varied. The Langmuir isotherm data obtained with varying MB concentrations fits the isotherm with an R2 of 0.99. The Langmuir parameters from the experiment were a Q (mg/g) of 68.02 and K (L/mg) of 0.385 while the RL value was 0.017, assuring a favourable adsorption. Next, the kinetics data were fitted with Unified Approach Model and the adsorption and desorption rate constants were determined to be 1.00E-8 ± 3.00E-9 and 2.60E-8 respectively. It was also found that the kinetic rate constants were initial concentration independent. Lastly, the CSTR adsorption study data was very comparable to the theoretical line predicted with the CSTR model, with very minute offsets from theoretical predictions. The maximum achievable utilization coefficient, ηmax was found to be 78% for TW-MB system, where higher utilization coefficient attributes to the higher adsorption capacity and better performance