Sanitary work in the smaller towns and in villages. In three parts. Part I. Some of the more common forms of nuisance, and their remedies. Part II. Drainage. Part III. Water-supply. / by Charles Slagg.

  • Slagg, Charles.
Date:
1876
Catalogue details

Licence: Public Domain Mark

Credit: Sanitary work in the smaller towns and in villages. In three parts. Part I. Some of the more common forms of nuisance, and their remedies. Part II. Drainage. Part III. Water-supply. / by Charles Slagg. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    part of the land requmng it, wliich may afterwards be allowed to rest and become aerated before other sewage is tm-ned on to it. Mr. Joseph Hutchinson, 22, Whitehall Place, London, suj)plies all particulars requu'ed. In some situations it would be impossible to place the sewage on land for ii-rigation or intermittent filtra- tion, unless at too great an expense of pumping or otherwise. In these cases the old j)lan of precipitation of the suspended matter is adopted, and the clarified liquid —the water—is run ofi into the natural watercoui'ses. It must be admitted that by this plan, although it is economical in the first outset, the gi'eater part of the fertilising value of the sewage flows off with the water, and that what is left behind in a solid state is not of much value—not more than one-seventh of the whole value,—the fertilising elements in solution bemg of a value six times that which is held in suspension, and which can be precipitated. Nevertheless, when it is impossible to adopt a system which saves more of the fertihsmg ingredients, this plan is one to which atten- tion is tm-ned with the view to apply it in the most effective manner. The sewage is received into tanks, or into tank-sewers, or tunnel-sewers, so ai'ranged that it is allowed to come to rest in one of them while another is being filled. The precipitation of the solid matter is hastened and made more perfect by the addition of some ingredient (as sulphate of alumma), which causes the solid matter of the sewage to flocculate and fall quicldy to the bottom, and, in order to prevent any fermentative action, by which a scum would rise to