The process that you are ...

The process that you are looking for depends on what is the ending state of the iron and the waste water that you want to treat. If it is only required a reduction to iron (II) and a later coprecipitation there are plenty of studies on this process with iron reducing bacteria. If it is only required the crystallization and precipitation of the iron (III), there are studios on biocrystallization by bacteria. An example is the Pseudomonas aeurognosa SM1 that can produce iron nanoparticles. If there are other heavy metals present like chromium, copper, cobalt, mercury, etc.. Bioelectrochemical systems are important candidates to do the heavy metal removal. This technology can reduce the COD and recover the heavy metals simultaneously.