Waste-assimilation study of Koshkonong Creek below sewage-treatment plant at Sun Prairie, Wisconsin
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Abstract
A waste-load-assimilation study of a reach of Koshkonong Creek below the Sun Prairie, Wisconsin, sewage-treatment-plant outfall indicated that a high level of treatment would be required to meet Wisconsin water-quality standards. To maintain a minimum dissolved-oxygen concentration of 5 mg/liter during the critical summer low-flow period, 5-day carbonaceous biochemical-oxygen demand in waste discharges should not exceed 5 mg/liter and ammonium nitrogen should not exceed 1.5 mg/liter. Advanced treatment with denitrification is required because stream-reaeration coefficients are not high enough to offset deoxygenation caused by an abundance of attached biological slimes. The slimes apparently consumed dissolved oxygen at a rate of about 110 mg/liter per day at the time of the stream survey. During the critical summer low-flow period, natural stream discharge is very small compared to waste-water discharge , so benefits of dilution are insignificant. An evaluation of two proposed alternative waste-water discharge sites indicated that the present discharge site is hydraulically superior to these sites. Stream-reaeration coefficients used in the study were based on measurements using the radioactive-tracer method. (Woodard-USGS)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Waste-assimilation study of Koshkonong Creek below sewage-treatment plant at Sun Prairie, Wisconsin |
| Series title | Open-File Report |
| Series number | 76-655 |
| DOI | 10.3133/ofr76655 |
| Year Published | 1976 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Wisconsin Water Science Center |
| Description | v, 44 p. |
| Country | United States |
| State | Wisconsin |
| County | Dane County |
| City | Sun Prairie |
| Other Geospatial | Koshkonong Creek |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |