Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Filtration Optimization Utilizing Polyphosphates
The objective of this study was to analyze the effect of a range of sodium hexametaphosphate concentrations on the performance of a rapid sand filter, and to determine if jar tests could be correlated with filter behavior. Another objective was to determine whether sodium hexametaphosphate could be used as a filter aid to give a deeper floc penetration into the filter bed, with no corresponding sacrifice in effluent quality resulting, therefore, in a closer to optimum filter performance. Results indicate that a phosphate concentration in excess of 0.01 ppm reduced the efficiency of iron removed by the filter and in the jar tests. At 0.01 ppm phosphate, the amount of iron removed was greater than without any phosphate at all. The general trend of iron removed in the jars and by the filter, when increasing concentrations of sodium hexametaphosphate are added to a suspension containing 1.0 ppm, is the same. The trends for turbidity removals by the filter and the jars are not the same. Hexametaphosphate does not appear to affect the turbidity‐reducing capacity of the filter until the hexametaphosphate concentration exceeds 0.1 ppm. At this concentration, turbidity removals by the jars is reduced significantly.
Filtration Optimization Utilizing Polyphosphates
The objective of this study was to analyze the effect of a range of sodium hexametaphosphate concentrations on the performance of a rapid sand filter, and to determine if jar tests could be correlated with filter behavior. Another objective was to determine whether sodium hexametaphosphate could be used as a filter aid to give a deeper floc penetration into the filter bed, with no corresponding sacrifice in effluent quality resulting, therefore, in a closer to optimum filter performance. Results indicate that a phosphate concentration in excess of 0.01 ppm reduced the efficiency of iron removed by the filter and in the jar tests. At 0.01 ppm phosphate, the amount of iron removed was greater than without any phosphate at all. The general trend of iron removed in the jars and by the filter, when increasing concentrations of sodium hexametaphosphate are added to a suspension containing 1.0 ppm, is the same. The trends for turbidity removals by the filter and the jars are not the same. Hexametaphosphate does not appear to affect the turbidity‐reducing capacity of the filter until the hexametaphosphate concentration exceeds 0.1 ppm. At this concentration, turbidity removals by the jars is reduced significantly.
Filtration Optimization Utilizing Polyphosphates
Smith, C. V. Jr. (Autor:in) / Medlar, S. J. (Autor:in)
Journal ‐ American Water Works Association ; 60 ; 921-938
01.08.1968
18 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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