Research School for Socio-Economic and
Natural Sciences of the Environment
Research School for Socio-Economic and
Natural Sciences of the Environment

Yvonne Mos

Date: 19 October 2018
Time: 13:30 - 15:00
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen

Dissertation title: 

Magnetite crystallization through oxidation and bioreduction: Processes for iron recovery from groundwater

Group: Wageningen University, Environmental Technology
Promotors: C.J.N. Buisman
Copromotors: J. Weijma

Extra information:


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.

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