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

This work discusses the results of experimental investigation on the study of coagulation's adsorption aspect for removing toxic ions 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 analyse the mechanism of the pollutant coagulation process using a fly ash-based coagulant. Several kinetic models were used to test the coagulation data and to examine the mechanism controlling coagulation adsorption. The present results of pollutant removal well-fit 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 (except for Ni and Ca for the Weber-Morris model).