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- W63866822 abstract "has been studied for many years, but the fact remains that there is still a wide discrepancy between theory, i.e., laboratory experiment, and practice. There is a definite reason for such divergence, it being the lack of any suitable test for evaluating the toughness or filtrability of particles. The of particle has received some consideration, but any practical operator can testify that the size of floe can be judged more accurately by visualization in either mixing basin or laboratory beaker than by measuring individual particles under the microscope. It may be asked if weak flocculation does occur at times and if alum, when it is used as a coagulant, does pass the filter at certain seasons. The answers to these questions must depend upon the honesty or the diligence of the operator, but it is the author's firm conviction that both are to be answered in the affirmative, and the proof of that reply is certainly evident from the fact that when either clear-water basins or storage reservoirs are cleaned, a sizable amount of precipitated aluminum hydroxide, or sludge, is found. Where activated carbon is used, it, too, may pass the filter during weak coagulation as is sometimes visually evident upon hydrant flushing, particularly at dead ends. In this observation, the author wishes to emphasize the fact that he is not confusing carbon with the magnetic iron oxide which is formed when corrosion is sufficiently severe to deplete the dissolved oxygen completely. The two may be differentiated easily by placing some of the pulverized dried sludge (obtained by settling out the black water from the flushed hydrant) on a piece of paper and oscillating a horseshoe magnet" @default.
- W63866822 created "2016-06-24" @default.
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- W63866822 date "1941-05-01" @default.
- W63866822 modified "2023-09-24" @default.
- W63866822 title "Notes on Current Flocculation Problems" @default.
- W63866822 doi "https://doi.org/10.1002/j.1551-8833.1941.tb14884.x" @default.
- W63866822 hasPublicationYear "1941" @default.
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