Refine search
Results 81-90 of 207
Heat shrinkable tubing as sewer pipe joints
1971
The river basin model: municipal services department
1971
The river basin model: social sector | Basin model: social sector
1971
The River Basin Model is not primarily a water management model. Through human interaction and computer simulation, it represents the entire complex economic, social, and governmental activities taking place within a specified local system. The manual contains the basic information and description of the model required by the social sector. It is assumed that the Model Overview and the Scenario descriptions have been read prior to the receipt of this manual. Once the players comprising the Social Sector have become familiar with the model in general, the particular city being represented, and the workings of the local economic, social, and government system they will be able to bring their own imagination and initiative to bear on the operation of the Social Sector and the population groups they represent.
Show more [+] Less [-]Closed system waste management for livestock
1971
Ngoddy, Patrick O.
Reduction of salt content of food processing liquid waste effluent
1971
Mercer, Walter A. | Ralls, Jack W.
Inorganic fertilizer and phosphate mining industries--water pollution and control
1971
Complete mix activated sludge treatment of citrus process wastes
1971
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.
Show more [+] Less [-]Research on the physical aspects of thermal pollution
1971
Sundaram, Thirukurungudi Rangasamy