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Biology and water pollution control
1971
Warren, Charles E. | Doudoroff, Peter
Design guides for biological wastewater treatment processes
1971
Removal of nitrate by an algal system
1971
Gianelli, William R.
Denitrification by anaerobic filters and ponds
1971
Sword, Bryan R.
Mechanisms of biological luxury phosphate uptake
1971
The chemical investigation of recent lake sediments from Wisconsin lakes and their interpretation
1971
Bortleson, Gilbert Carl
Detection of abandoned underground coal mines by geophysicalmethods
1971
Maximizing storage in combined sewer systems
1971
Closed system waste management for livestock
1971
Ngoddy, Patrick O.
Control of pollution from outboard engine exhaust
1971
A reconnaissance study has been made to determine the extent of pollution which results from the operation of a two-cycle outboard engine. Comparisons have been made of engine operation with and without a pollution control device attached. Studies have also been made of the biodegradability of the fuel and exhaust products. Tests made in a swimming tank with an untuned engine have shown that the quantity of fuel wasted as exhaust varied from about 7 percent of the volume of fuel used at high speeds, to over 30 percent at low speeds. For a recently tuned engine, the quantity of fuel discharged ranged from about 3 percent at high speeds to about 26 percent at low speeds. When the Goggi pollution control device was installed, these quantities were intercepted and collected rather than discharged with the exhaust. Analyses at various depths indicated that nearly all products separated from the water in a short time and collected on the surface. Very little dissolved or emulsified oil was noted. Various analytical techniques were studied. Both fuel and exhaust products are capable of supporting microbial growth. Growth rates, however, appear to be limited by available oxygen.
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