Influence of Typha latifolia and fertilization on metal mobility in two different Pb-Zn mine tailings types

The Science of the Total Environment
Donna L Jacob, Marinus L Otte

Abstract

Storing metal-rich mine waste (tailings) under submerged and reduced conditions can prevent the release of metals to the water column, but introduction of wetland plants on these sediments may alter the reducing environment through root oxygen diffusion or organic matter accumulation. Fertilization of these wetlands can enhance plant growth, but also may either strengthen reducing conditions via microbial stimulation, or increase the redox potential (Eh) through increased root radial oxygen loss. This long-term study (2.25 years) investigated the porewater As, Fe, and Zn concentrations of waterlogged Pb-Zn tailings from two Irish mines, Silvermines and Tara mines, with addition of Typha latifolia, fertilizer, or both treatments combined. In both tailings types, the fertilized plants showed significantly increased total biomass production, but the plants grew greater biomass in Tara tailings relative to Silvermines tailings even without fertilization. In Tara mines tailings, the addition of plants increased Eh and mobilized Zn; the addition of fertilizer enhanced reducing conditions and increased porewater concentrations of As and soluble sulfides; and the combination of treatments on these tailings resulted in complex interacti...Continue Reading

Citations

Oct 5, 2013·Environmental Science and Pollution Research International·Muhammad Aqeel KamranHassan Javed Chaudhary
Dec 3, 2014·Ecotoxicology and Environmental Safety·Menka Kumari, B D Tripathi
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Jan 16, 2009·Journal of Environmental Sciences (China)·Dongmei Lei, Changqun Duan
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