Abstract: The present invention relates to the application of the biological adsorption and biological oxidation ability of both conventional wastewater treatment biological selection technology and, if desired, chemically-enhanced wastewater treatment biological selection technology to remove pollutants from precipitation-generated flows collected by a combined sanitary sewer system, a separate sanitary sewer system, and/or a combination of both systems for: (1) the biological adsorption and oxidation of suspended and dissolved pollutants as measured by standard methods tests for carbonaceous biochemical oxygen demand, and/or (2) the biological adsorption of all other dissolved non-conservative and conservative pollutants as measured by all other standard methods tests for such pollutants.