TALK CANCELLED - Kinetics of adsorption of pollutants removal from mine wastewater by a coal fly ash-based coagulant

The utilization of an alternative coagulant for treating industrial effluent with minimal operational cost has seen considerable growth in recent years. Generally, the coagulation mechanism of a coagulant is charge neutralization followed by adsorption during the floc growth. This work discusses the results of experimental investigation on the study of coagulation's adsorption aspect for removing impurities (Mg, Al, Zn, and total dissolved solids (TDS)) from mine wastewater using fly ash-based coagulant. The studied mine wastewater was susceptible to the coagulation process. The important part of this research was to analyze the mechanism for the process of coagulating impurity by a fly ash-based coagulant. Different kinetic models were used to test the coagulation data and to examine the mechanism controlling the adsorption aspect of coagulation. The results for impurity removal are consistent with the pseudo-second-order model. Film diffusion and intraparticle diffusion were involved in the process. The intraparticle diffusion coefficients for the different pollutants were calculated from Weber–Morris and Boyd’s models; the results showed that the intraparticle diffusion coefficients for the specific pollutants range from 1.8 10^-11 to 0.57 10^-13 cm²/sec and 1.05 10^-12 to 1.87 10^-12 cm²/sec, respectively.