In addition, the oxygen consuming the stream from low dissolved oxygen concentrations that can be deleterious to desirable aquatic species. Nutrients, tewater must be minimized protect such as nitrogen anil phosphorus, should be to prevent and subsequent siltation. Microbiological contuunanants and other pollutants should be removed to protect downstream users, including contact users (e g boaters and swimmers) Typical muticipal wastewater contains about 220 mg Li of suspended solids and BoD. The organic composition of wastewater is approximately 50 percent proteins t percent carbohydrates. 10 percent fats and oils and trace amounts of priority pollutants and surfactants The ulicrobiological composition of wastewater includes 10s. 108 cFU coliform organisms, 103-101 fera streptococci, 101-10 protozoan cysts, and 10 -10 virus partieles.