The experimental study of cadmium contaminated groundwater remediation by permeable reactive barrier with bamboo charcoal-zeolite mixture
This paper analyzes the adsorption mechanism of the Permeable Reactive Barrier(PRB)with bamboo charcoal-zeolite mixture to cadmium,as well as its timeliness combining physico-mechanical tests,static batch tests,dynamic column experiments,microscopic characterization analysis,and groundwater flowing numerical simulation.When bamboo charcoals(particle size greater than 0.18mm)and zeolites(particle size greater than 0.5mm)were mixed in a mass fraction of 1∶10 to 3∶10,the bamboo charcoal-zeolite mixtures could not only remove cadmium from groundwater effectively,but also had good permeability and shear strength.The adsorption capacity of the bamboo charcoal-zeolite mixtures for cadmium increased with the growing bamboo charcoal ratio and decreasing particle size.The penetration and depletion time of the PRB column decreased with increasing groundwater flowing rate and column concentration.The removal reactions of cadmium by bamboo charcoal-zeolite mixtures mainly included complexation,chelation,and ion-exchange.At a groundwater cadmium contaminated site with a thicker PRB and slower groundwater flowing rate,the effective operation time of the PRB was longer.
万方数据
维普
