There is a nice, cheap and ...

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There is a nice, cheap and natural way to do it, using naturally occurring sulphur oxidising bacteria (SOB).  I have attached a link to a paper on the subject. 

http://www.acenz.org.nz/uploads/Events/INNOVATE%20Projects/29.%20Wairakei%20Bioreactor%20-%20webprofile-edited%20by%20HM.pdf

and

https://www.youtube.com/watch?v=XZD0h9rgiRY

It basically just uses long lengths of pipe with a bio-film and uses no energy and was very effective.  In fact it was the Global Winner for the Design Projects Category of the 2014 International Water Association (IWA) Global Project Innovation Awards Competition with the award presented in Lisbon.  I know the design engineer very well and can put you in touch if interested.

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