Mercury Accumulation and Bio-transportation in Wetlands Biota Affected by Gold Mining - Modelling and Remediation

摘要

Phytoremediation is cost-effective, eco-friendly technology for the removal of metals contaminating aquatic ecosystems. Biogeochemical models for mercury in wetlands were developed by monitoring its accumulation, speciation, methylation and bio-transportation with seasonal changes, emissions, transformations of environmental parameters and biological responses. The lowest bioaccumulation factors were during the wet season indicating lower macrophyte uptake capacity. Translocation factors show mercury accumulation in roots in the wet season; opposite to the dry season. Few plants are proposed for constructed wetlands for mercury phytoremediation. The different uptake and speciation patterns suggest that the most effective wetlands should include few different plant species working together.