Iron is definitely amenable ...
Published by Walter Weinig, PG, PMP, Laramide Sciences - Principal Consultant, Senior Project Manager
Iron is definitely amenable to removal by microbiological processes, as are many other metals (but not all metals under all conditions). Jim Gusek of Sovereign Consulting in the USA has put together an extensive database of literature related to passive and biological treatment of metals in mining-impacted water. You can access the database of references at http://www.sovcon.com/index.php/resources/sovereign-mining-resource-database-january-2015.