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Sources: U.S. Public Health Service Municipal Wastewater Inventories and USEPA Clean Water Needs Surveys.

Notes: Less than secondary facilities = Primary + advanced primary; Greater than secondary facilities = Advanced secondary + advanced treatment; No discharge = Facilities that do not discharge effluent to surface waters.

Sources: U.S. Public Health Service Municipal Wastewater Inventories and USEPA Clean Water Needs Surveys.

Notes: Less than secondary facilities = Primary + advanced primary; Greater than secondary facilities = Advanced secondary + advanced treatment; No discharge = Facilities that do not discharge effluent to surface waters.

Table 2-9 presents the calculated CBODu removal efficiencies by municipal wastewater treatment type and corresponding effluent CBODu concentrations.

Effluent NBODu loading rates were estimated based on influent NBODu and NBODu removal efficiencies reported for TKN (expressed as a percentage) associated with each category of wastewater treatment. Removal efficiencies for TKN were based on data compiled in Gunnerson et. al (1982) for primary facilities, AMSA (1997) for secondary facilities, and AMSA (1997) and MWCOG (1989) for advanced wastewater treatment facilities. Since NBODu is estimated from TKN and the constant stoichiometric ratio of 4.57 g O2 per g N, removal efficiencies for TKN and NBODu

TABLE 2-8 CBOD5 Removal Efficiencies by Municipal Wastewater Treatment Type and Corresponding Effluent CBOD5 Concentrations

Muncipal Wastewater Treatment Type

Removal Efficiency (%)

Effluent Concentration (mg/L)

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