There is but one solution. It ...

There is but one solution. It is called BIOREMEDIATION. There is only one species that has the genetic code of reducing all organic compounds into their elemental/nutritional form. It is Called ARCHAEA. The load density or type is irrelevant.  Your only real decision is the potable water discharge. 1. back into the reservoir or 2. sell/give the nutrient dense potable water to the farmers. 3. dump it into rivers allowing the cleaning process to continue all the way to the ocean.  The process has been working for a few billion years. Hard to compete with that work history.