Water Supply, Considered Mainly from a Chemical and Sanitary StandpointJ. Wiley, 1883 - 232 páginas |
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Términos y frases comunes
action albuminoid ammonia algæ analysis animal artesian basin become Blackstone River Board of Health Boston carbonate of lime carbonic acid character chloride cisterns clean color compounds considerable cubic decay deposit depth disease dissolved distilled effect examination feet filtered water filtering material filtration flow furnish gallery gases grains gravel ground water hard water impure inches increase iron less lime liquid locality magnesia manufacturing Mass Merrimack River meters method nitrates obtained odor ordinary organic carbon organic matter oxide oxygen particles passes permanganate pollution pond portion present pump quantity of water removed Report reservoir river water Rivers Pollution Commission salt sand sanitary sediment service pipes sewage sodium soluble solution source of supply spicules springs stratum stream substances sulphuric acid surface waters suspended matter TABLE takes place temperature tion TOTAL SOLIDS tube turbid U. S. gallon various vegetable waste water contains water supply weight
Pasajes populares
Página 75 - Any liquid which contains in solution, in 100,000 parts by weight, more than two parts by weight of any metal except calcium, magnesium, potassium, and sodium.
Página 75 - Any liquid possessing an acidity greater than that which is produced by adding two parts by weight of real muriatic acid to 1000 parts by weight of distilled water. (i) Any liquid possessing an alkalinity greater than that produced by adding one part by weight of dry caustic soda to 1000 parts by weight of distilled water.
Página 75 - ... in suspension more than three parts by weight of dry mineral matter, or one part by weight of dry organic matter in 100,000 parts by weight of the liquid.
Página 19 - Germ Theory of Disease," says, " This theory is, that many diseases are due to the presence and propagation in the system of minute organisms (ie, living beings) having no part or share in its normal economy.
Página 216 - Report of the Commissioners appointed in 1868 to inquire into the best means of preventing the pollution of Rivers (Mersey and Ribble basins).
Página 26 - ... organisms, it seems quite conceivable that a water containing organic matter of any kind, including vegetable matter, may be harmless at one time and harmful at another, when perhaps a different stage of fermentation or putrefactive change may have been entered upon, and special organisms may have made their appearance or entered upon a new phase of existence. Thus there might possibly be safety in drinking a peaty water, or water filtered through beds of dead forest leaves, when fresh; danger...
Página 44 - It is a great mistake to suppose that the proper way to consult a chemist is to send a sample of water in a sealed vessel with no hint as to its source. On the contrary, the chemist should know as much as possible as to the history and source of the water, and, if possible, should take the sample himself.
Página 40 - ... value for its results, which has been denied to those of other methods. It is but a method of approximation, involving sundry errors, and in part, a balance of errors. 10. There is-, however, good ground for believing, that in many, perhaps most cases...
Página 152 - ... and the upper layer of sand, for a depth of one-half or threequarters of an inch, is removed. When by successive parings the thickness of the sand has been considerably reduced, that which has been removed is washed and replaced so as to restore the original thickness, the waste of washing being made up with fresh sand.
Página 25 - Thus, if the whole of the organic carbon and nitrogen found in such waters as Nos. 35 and 36, of the highly dangerous character of which there can scarcely be a doubt, existed as strychnine, it would be necessary to drink about half a gallon of the water at once in order to swallow an average medicinal dose of the alkaloid. It is not easy to believe that the ptomaines, or any other chemical products of putrefactive change as yet observed, can possess an intensity of toxic power so very much greater...