Oxidation can take many ...

Oxidation can take many forms.  From the 1970s I have helped with the design of systems that use spray oxidation for iron.   I have seen systems From the 1930s still running in the 1980s. The water is sprayed up into the air over a large basin and the solid allowed to settle out while the clean water is drained from the top surface supernate;  the procedure repeated several times.  This has been done with mine water, oil field water and well water with high iron content.  Finishing can be done with chlorine or allowed to be exposed to air. Injected air has been used in several ways. 

Why use the spray method:  It may be slow, but it is very - very cheap.  With pressure on the well, I have seen this done as a first stage purification with no electric power for pumps.

Mn has the additional problem with being a sticker mess.  However, it has also been removed by the above old method.  

A lot of this depends on the volume of the water treated: that will affect which method you want to use. The selection of the method used will require a lot of study in the pretesting of the water: not just a few times, many times over a longer time period.  Does the analysis change at certain times, or is it steady?

By the way, pay attention to the pH of the water you are trying to clean up.  Also note the P & M alkalinities and the calculations for carbonate and bicarbonates.  Changes in pH can bring a lot of stuff out of solution.  Go back to some old quantitive analysis chemical books.  One forgotten way to clean up things was to raise the pH to the free OH alkaline levels and watch things fall out of solution.  Before use, the pH of this water was then revered with the addition of acid, usually sulfuric because it is usually the lowest in cost.  

Check the levels for Calcium and Total Hardness in your tests as well as test for NaCl, sulfates and sulfur.  Down a borehole?  I would run a full analysis for metals with an ICP, with lab testing for what will work,.

The real question is why do you want to clean the water up:  what do you want to use it for, how much do you want to treat, how long will this project go on?

With low volume, and short time usage; you may look at modern methods such as Reverse Osmosis. 

But, because you mention "Borehole", what is the commercial purpose for the water.  That term sounds like an oilfield: maybe one that is trying to re-inject the water back down nearby wells in a pattern to force the oil out for production purposes.   Oilfield fracking and water floods I know about along with all of the chemicals used to aid in opening the structures for better oil production.

If that is what you are looking for; it is a more complex subject that will require help from someone with experience in this field.  

Good luck to you.

I hope this helps.

Waymon E. Hofheins

President: Blue Valley Laboratories, Inc.