A Manual of Practical Hygiene for Students, Physicians And Medical Officers
A Manual of Practical Hygiene for Students, Physicians And Medical Officers
Charles Harrington
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It is, of course, necessary that the screened matters be removed frequently and buried or burned, and that the reservoir be cleansed at r^ular intervals. 5. Sewage Filtration. — ^The method of intermittent filtration of sewage is the same in principle as the process described in the chapter on Water. Like that, it is more than a mechanical separation of sus- pended matters : it is a process of screening, oxidation, and eventually almost complete purification, much like sewage irrigation. As ear...ly as 1836, Bronner, of Heidelberg, endeavoring to learn the reason why the constituents of fertilizers in solution failed to reach the deeper layers of the soil, filled a bottle, having a small hole in the bottom, with sifted garden soil and poured in gradually a thick stinking manure juice, and observed the character of the effluent, which he found to be almost odorless and colorless, and devoid of fertilizing properties. Digitized by Google METHODS OF SEWAGE DISPOSAL. 501 But the system of sewage purification by this means had its b^in- ning within recent years at the experiment station at Lawrence under the direction of the Engineering Department of the State Board of Health of Massachusetts, and is now in actual use by many munici- palities in this country and abroad.
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