Water Supply, Considered Mainly from a Chemical and Sanitary StandpointWiley, 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 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 Mass Merrimack River meters method nitrates obtained odor ordinary organic carbon organic matter organic nitrogen oxide oxygen particles passes permanganate pollution pond portion present pump quantity of water removed Report reservoir river water Rivers Pollution Commission salt samples sand sanitary sediment service pipes sewage 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 - ... 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 75 - 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 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 75 - Any liquid which contains, in 100,000 parts by weight, more than one part by weight of sulphur, in the condition either of sulphuretted hydrogen or of a soluble sulphuret. (h) 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.
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 42 - It is not possible to decide absolutely upon the wholesomeness or unwholesomeness of a drinking water by the mere use of any of the processes examined for the estimation of organic matter or its constituents.
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 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.