论文部分内容阅读
Coexisting arsenic (As) and antimony (Sb) in mining wastewater is a common and great conc.On-site simultaneous removal of As and Sb from mining wastewater was achieved by using a reusable granular TiO2 column in this study.To evaluate the accuracy of the scale-up procedure,As and Sb adsorption from wastewater was studied in both large (600 g TiO2) and small columns (12 g TiO2) based on the proportional diffusivity rapid small-scale column tests (PD-RSSCTs) design.The comparable As and Sb breakthrough curves obtained from small and large columns confirmed the accuracy of the PD-RSSCT theory in the design of large-scale columns.Meanwhile,the consistent As and Sb adsorption results from batch and column experiments suggested that TiO2 adsorption for As and Sb can be predicted from bench-scale tests.Charge distribution multi-site complexation (CD-MUSIC) and onedimensional transport modeling integrated in the PHREEQC program were performed to study the adsorption behaviors of As and Sb on the TiO2 surface.Coexisting ions,such as Ca2+,Mg2+,and Si4+,play an important role in As and Sb adsorption,and the breakthrough curves were well simulated after considering the compound ion effects.The results from this study highlight the surface reactions of As and Sb on TiO2 and provide a practical way for on-site remediation of industrial wastewater.