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Magnetite crystallization through oxidation and bioreduction: Processes for iron recovery from groundwater
Group: Wageningen University, Environmental Technology
Promotors: Prof.dr.ir. C.J.N. Buisman
Copromotors: Dr.ir. J. Weijma
More than 50% of drinking water worldwide is produced from groundwater. Iron removal is part of the purification process. We propose to combine the iron removal with the production of magnetite: a compact ferrous-ferric iron oxide with strong magnetic properties and therefore multiple high-end applications. Magnetite can be formed through several pathways. Chapters 3 and 4 focus on the partial oxidation method, where Fe2+ partially oxidized by either NO3- or O2 to form magnetite in a continuous process. The effects of iron feed concentration, HRT and medium complexity are evaluated. Chapter 5 focusses on the partial reduction method. Here, partial biological reduction of hydrous ferric oxide (HFO) with lactate, glucose, ethanol leads to magnetite formation in a defined pH/ORP range. Chapter 6 describes the partial bioreduction of HFO in a continuous reactor, yielding green rust, that can then co-precipitate with aqueous FeCl3 to form magnetite.
By September we will present an overview of SENSE dissertations on this page, with links to the full texts of the dissertations.