||Effect of Phosphorus Control Options on Lake Water Quality.
Lorenzen, Marc W. ;
||Tetra Tech, Inc., Lafayette, CA.;Environmental Protection Agency, Washington, DC. Office of Toxic Substances.
||TETRAT-TC-3930; EPA-68-01-3961; EPA/560/11-79/011;
Water pollution control ;
Sewage treatment ;
Mathematical models ;
Correlation techniques ;
National Eutrophication Survey ;
Nonpoint sources ;
Tertiary treatment ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Data collected as part of the National Eutrophication Survey (NES) were used to test the consequences of eight different phosphorus control options. The control options included detergent limitations, municipal treatment plant control, nonpoint source control and combinations of tertiary sewage treatment and nonpoint source control. The results indicated that although site specific studies should be conducted for any given lake, as a general rule detergent phosphorus control would be of marginal value. Eighty percent reductions in municipal treatment plant discharges would reduce average lake phosphorus concentration from 0.084 mg/l to 0.059 mg/l. It was found that nonpoint source control was more effective in increasing the number of lakes with less than 0.025 mg/l of total phosphorus than was an equivalent level of point source control.