Effects of pH Manipulation, Biological Reduction, and Plant Growth on Cu2+ and Zn2+ Removal from Mine Drainage Using Iron-Oxide-Enriched Red Earth Soils

摘要: Constructed wetland is an efficient method used to control heavy metal pollution from acidic wastewater, especially when local soils could be as filling material reduce construction cost. This study investigated the effects of pH manipulation, biological reduction, and plant growth on removal metals (Cu2+ Zn2+) using iron-oxide-enriched red earth soils. Results indicated that had limited retention capacity (MRC), whereas CaCO3 alteration significantly improved MRC. In batch experiment, MRCs Cu2+ Zn2+ in 3% were 420 291 mg/kg, respectively, compared with values 246 117 mg/kg without alteration. column studies, effluent concentrations remained <0.03 0.13 mg/L, over 0.96 10.81 mg/L Biological reduction caused iron-oxide mineral dissolution, but within The Canna (Canna indica) prompted transport deep into soil layers. However, was retarded by In, conclusion, cost-effective materials attenuate mining drainage constructed even under conditions.