By E. W. Caryl Thomas (Auth.)
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Over 1000 bacteria capable 0 of growing on gelatin at 20 C . in 3 days or over 100 on agar at 37° C . in 24 hours, and which contains typical B. c. or less, is probably contaminated with manurial matter. Water should be condemned if it contains large numbers of bacteria of any kind ; B. c. ; any pathogenic organisms ; or if it gives enteritidis changes in milk cultures or ferments glucose or lactose. —There are over 2000 bodies supplying water, about one-half operating by virtue of special or general Acts, most of the others being companies or persons operating without statutory powers.
In the excess-lime method, sufficient lime is added above that required to remove the temporary hardness, 52 PUBLIC HEALTH the period of action being 6 to 24 hours. Other processes are ozonization, treatment by ultra-violet rays, or the addition of chemicals. In the catadyn process water is passed through a filter of catadyn silver which is an activated form of silver deposited on particles of sand. Distribution of Water,—Water is drawn from the storage reservoirs to the purification works from which it is pumped to the covered service reservoirs.
And that from the water-closet system and urinals. —The rain-water may be disposed of with the liquid from the other two sources in the combined system ; or in the separate system it is run by itself direct to the nearest watercourse. In the one system the rain-water runs down the house rain-water pipe, flowing in the house-drain to the sewer where it is joined by the rain-water from streets and other impervious surfaces which enters the sewers by the gullies. In the other system it is conveyed by a separate set of pipes.
An Introduction to Public Health by E. W. Caryl Thomas (Auth.)