Results 211 to 220 of about 1,052 (255)

Waste Stabilization Ponds in Europe

Water and Environment Journal, 1992
ABSTRACTThe European countries where sewage treatment in waste stabilization ponds is largely developed and commonly used are West Germany (more than 2000 operational systems) and France (about 2500 plants). Portugal has over 50 systems at present and will have about 100 by the year 1993.
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Light penetration in waste stabilization ponds

Water Research, 1994
Abstract The penetration of light into waste stabilization ponds was studied because of its importance in pathogen removal and algal productivity. The attenuation of light in ponds was dominated by light absorption by gilvin (also called dissolved yellow matter or humic substances) and algae, light scattering processes (turbidity) being of no ...
Curtis TP, Mara DD, Dixo NGH, Silva SA
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Phosphorous Models for Waste Stabilization Ponds

Journal of Environmental Engineering, 1984
A laboratory investigation was conducted to evaluate the utilization and recycle of phosphorous in waste stabilization ponds (WSP). Two pond systems were operated under three different loading conditions during a period of 22 months. System I consisted of three series‐connected ponds: an anaerobic WSP followed by an intermediate facultative WSP and a ...
Harvey J. S. Houng, Earnest F. Gloyna
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Effect of tapering on the performance of waste stabilization ponds

Water Research, 2001
A model for wastewater degradation in a tapered waste stabilization pond was derived as a modified Bessel function by materials balance approach. Based on hypothetical data, the tapered model gave lower faecal bacteria removal than the conventional (rectangular) model for various values of dispersion number, die-off rate coefficient, average width and ...
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Hydraulic Modeling for Waste Stabilization Ponds

Journal of the Environmental Engineering Division, 1981
Treatment performance of waste stabilization ponds is a function of both the hydraulic transport and the biological and chemical transformation processes within the pond. Both the efficient hydraulic design of these ponds and the appropriate mathematical models for describing the hydraulic transport process are identified.
Raymond A. Ferrara, Donald R.F. Harleman
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Loading Rates on Waste Stabilization Ponds

Journal of the Sanitary Engineering Division, 1969
Pond performance is affected by temperature, solar radiation, and wind-speed; therefore, facultative pond design should reflect the influence of local climatological conditions. Ponds located in mild climate areas are usually designed with higher loading rates than ponds in cold climate areas. Present recommended loading rates in the United States vary
Larry W. Canter, Andrew J. Englande, Alfred F. Mauldin   +2 more
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Sulfide Production in Waste Stabilization Ponds

Journal of the Sanitary Engineering Division, 1969
This investigation deals with the production and release of hydrogen sulfide from waste stabilization ponds, and required design modifications, resulting from increased sulfate or hydrogen sulfide content. A 6-ft deep facultative pond was operated under seven different operating conditions.
Earnest F. Gloyna, Ernesto Espino
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Design Principles of Waste Stabilization Ponds

Journal of the Sanitary Engineering Division, 1969
Waste stabilization ponds will be more effectively employed as pollution control systems if suitable design formula and corresponding design parameters are made available to design engineers. To accomplish this objective, an analogy has been drawn between a first-order chemical reactor and a waste stabilization pond.
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Pilot Waste‐Stabilization Pond in Tanzania

Journal of Environmental Engineering, 1992
It is claimed that waste‐stabilization ponds provide an efficient, inexpensive, and appropriate form of wastewater treatment for developing countries. Based on negative experiences in Tanzania, this paper concludes that waste‐stabilization ponds designed by standard western design practice cannot always be expected to perform well without at least ...
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Dispersion Model for Waste Stabilization Ponds

Journal of Environmental Engineering, 1985
The partially‐mixed or dispersed‐flow equation is proposed for use in pond design for organic and bacterial reductions. This equation considers the effects of hydraulic detention time (θ), reaction rate coefficients, and the dispersion factor including short‐circuiting, and other hydraulic transport processes which influence the pond's performance ...
Chongrak Polprasert, Kiran K. Bhattarai
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