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Powerboat engine discharges as a nutrient source in high-use lakes. Research technical completion report, 14-09-000-G1222-06 Item Info

Modern internal combustion engines burn fuels containing various nitrogen and phosphorus compounds as additives (eg: alkyl phosphate, amine phosphate, etc.). Nitrogen oxides are also formed from atmospheric gases during the combustion process. In the case of marine engines, exhaust gases and incompletely burned fuel and oil are discharged directly into the water. In-situ enclosure experiments were conducted to quantify nitrogen and phosphorus additions and the biological response from two- and four-cycle outboard engines. The modern two-cycle outboard engine produced 300 mg total nitrogen and 1.0 mg total phosphorus per liter fuel consumed. The 1970 untuned two-cycle outboard produced 180 mg N and 0.9 mg P and the new four-cycle outboard produced 91 mg N and 0.0 mg P per liter fuel consumed. The untuned two-cycle outboard consumed about three times as much fuel as the other two engines. The biological response was moderate considering the concentrated nature of the tests. A motorboat census was conducted on Twin Lakes, Kootenai County, Idaho throughout the 1986 boating season and annual fuel consumption was estimated. Phosphorus and nitrogen loading to Twin Lakes from motorboat engine discharges were calculated and are low when compared to loading from other sources

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Title:
Powerboat engine discharges as a nutrient source in high-use lakes. Research technical completion report, 14-09-000-G1222-06
Authors:
Hallock, D.; Falter, C. M.
Date Created (ISO Standard):
1987-10
Description:
Modern internal combustion engines burn fuels containing various nitrogen and phosphorus compounds as additives (eg: alkyl phosphate, amine phosphate, etc.). Nitrogen oxides are also formed from atmospheric gases during the combustion process. In the case of marine engines, exhaust gases and incompletely burned fuel and oil are discharged directly into the water. In-situ enclosure experiments were conducted to quantify nitrogen and phosphorus additions and the biological response from two- and four-cycle outboard engines. The modern two-cycle outboard engine produced 300 mg total nitrogen and 1.0 mg total phosphorus per liter fuel consumed. The 1970 untuned two-cycle outboard produced 180 mg N and 0.9 mg P and the new four-cycle outboard produced 91 mg N and 0.0 mg P per liter fuel consumed. The untuned two-cycle outboard consumed about three times as much fuel as the other two engines. The biological response was moderate considering the concentrated nature of the tests. A motorboat census was conducted on Twin Lakes, Kootenai County, Idaho throughout the 1986 boating season and annual fuel consumption was estimated. Phosphorus and nitrogen loading to Twin Lakes from motorboat engine discharges were calculated and are low when compared to loading from other sources
Subjects:
in situ tests eutrophication nitrogen phosphorus boats recreation wastes
Location:
Twin Lakes
Latitude:
47.88
Longitude:
-116.89
Collection:
IWRRI
Series:
Water for Idaho
IWRRI number:
198706
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Preferred Citation:
"Powerboat engine discharges as a nutrient source in high-use lakes. Research technical completion report, 14-09-000-G1222-06", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-198706.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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