Looks like there's a few different groups looking into the use of bacteria in water purification.
Lawrence Livermore National Laboratory
- Discovery and study of abandoned mine bacteria that release proteins that cause metals to aggregate and precipitate out of water.
Arizona State's Biodesign
- Using a membrane biofilm reactor, bacteria can oxidize a variety of harmful chemicals into harmless byproducts and water. This means a zero toxic waste filtration system at low costs.University of Nottingham
- Researchers here have been devising a way to use nano-filtration alongside bacteria, allowing the bacteria to clean the filters and thereby extend the filters lifetime before breakdown. This has the useful side effect of creating high caloric byproduct that can be used as fuel.