closed loop water purefier

Here is the information and thought process. n

My deep well is high in hydrogen sulfide.  All other potability tests indicate safe to drink.
It has a solar powered pump.  Lots of unused power available when pump is not running.
Fuel cells combine Hydrogen and Oxygen to produce electricity, heat and water.

Those are all valid needs in an off grid homestead.
My greatest need is good drinking water.

How do I create a closed loop system which would utilize the hydrogen sulfide water to make
fuel to make clean water.  

Depending on where you live can you simply harvest rainwater and sand filter it? You only need an average of 2l / day.
Forget complicated processes to clean your ground water.