There are several different ...

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There are several different treatment  technologies available for the removal of arsenic from polluted water bodies.  However, I would suggest the bacterial treatment would be one of the promising methods for  arsenic removal. 

Since, bacteria are active scavengers of metal ions and have larger surface area to volume ratio, the direct adsorption of arsenic to the charged surfaces of the bacterial cells could occur, secondly the potential of bacteria to oxidize Ar(III) to Ar(V) could also be utilized in the treatment process, third bacteria promotes the oxidation of iron. The so formed biogenic oxides of iron could  accelerate the adsorption of arsenic. However, it is cautioned that bacteria could also convert a less toxic element to a more toxic form and viz versa depending upon the environmental conditions. 

You may refer to the below links and to the earlier reply from other colleagues.  

http://www.sswm.info/content/arsenic-removal-technologies

http://www.sciencedirect.com/science/article/pii/S0959652612000492