I have heard of a biological ...

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I have heard of a biological process being used for iron and manganese removal which is often a problem in groundwater to be used for potable water in my country South Africa. I don't have direct experience in this. I would expect that a specific culture will be needed to seed and start the process and possibly other nutrients may be needed to get the effective cell mass growth for optimum removal of an activated sludge by settlement of dissolve air flotation.