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Résultats 21-30 de 101
Estimating costs and manpower requirements for conventional wastewater treatment facilities
1972
Patterson, W. L. | Banker, R. F.
Data for estimating average construction costs, operation and maintenance costs, and manpower staffing requirements, are presented for conventional wastewater treatment plants ranging from 1 to 100 mgd in capacity, and for stabilization ponds ranging from 0. 1 to 10 mgd in capacity. Estimating data are included for 21 separate components of conventional plants and 6 separate components of stabilization ponds. Examples of use of the data are given. Estimated average construction costs and operation and maintenance costs are related graphically to appropriate single parameters for respective plant components. Occupation descriptions for 24 job titles related to wastewater treatment, developed in accordance with standards of the Dictionary of Occupational Titles, are included. The data presented provide means of estimating costs and staffing requirements for a variety of conventional wastewater treatment facilities on an average basis, but do not supplant the need for detailed study of local conditions or recognition of changing design requirements in preparing estimates for specific application.
Afficher plus [+] Moins [-]Waste wool as a scavenger for mercury pollution in waters
1972
Tratnyek, Joseph P.
Investigation of porous pavements for urban runoff control
1972
Thelen, Edmund | Grover, Wilford C. | Hoiberg, Arnold J. | Haigh, Thomas I.
Laboratory and economic studies were undertaken to determine the feasibility of utilizing porous pavements to alleviate combined sewer overflow pollution and reduce the design parameters of storm sewer systems by allowing storm runoff to percolate back into the ground. Laboratory studies of candidate materials revealed a porous asphaltic concrete containing 5.5% asphalt by weight and aggregate graded to allow a water flow of 76 in. per hour to be the optimal porous road material. Materials testing for stability, durability, and freeze-thaw susceptibility proved this material suitable for use in road construction.
Afficher plus [+] Moins [-]Oil pollution and marine ecology
1972
Nelson-Smith, A (Anthony)
A feasibility demonstration of an aerial surveillance spill prevention system
1972
Welch, Robin I. | Marmelstein, Allan D. | Maughan, Paul M.
Hypochlorite generator for treatment of combined sewer overflows
1972
Leitz, F. B. | Michalek, Steven A. | Greatorex, J. L.
Water pollution and its control
1972
Fish, Hugh
Biochemical ecology of water pollution
1972
Dugan, P. R. (Patrick R)
An inter-disciplinary approach to water pollution.
Afficher plus [+] Moins [-]Filtration of municipal waste with a moving bed contactor
1972
Mixon, F. O.
