Abstract
The electrocoagulation (EC) process was conducted to treat the vinasse waste with a variation of agitation speeds of 0, 250, and 500 rpm which can be expressed in Reynolds (Re) numbers of 0, 5.47 × 104, and 1.09 × 105, respectively. The goal of this study was to investigate the effect of agitation speed on the EC process, build a novel mechanistic model, and analyze the effect of agitation speed through the proposed mechanistic model. The measured parameters during the EC process were the changes in anode weight, electrical voltage, liquid temperature, liquid pH, liquid volume, COD concentration, Fe concentration, scum mass, and sludge mass. The results showed that the agitation of 250 rpm (Re of 5.47 × 104) resulted in a higher COD mass removal (67.62 %) than the two others. A detailed mechanistic model was successfully built with nine kinetic constants of ka, N, kv, kf, kpH, kRi, kRd, kht, kc. Based on simulation results, various agitation speeds affected the values of N, kv, kf but not for the other kinetic constants. Furthermore, the equations expressing the values of N, kv, kf as a function of Re number were built. Finally, the optimization was conducted to find the optimum Re number resulting in the maximum COD mass removal. The predicted optimum Re number was 3.82 × 104 with COD mass removal of 70.01 % by the EC process for 8 h.
Published Version
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