. Preventive medicine and hygiene. Fig. 123.—Chemical Precipitation Plant at Wohcester, Mass., Outlet. farms of Berlin and Paris are very extensive, the Berlin farms coveringnearly 20,000 acres. The rate of application varies from 3,000 to 15,000gallons per acre daily, an acre serving for the sewage of from 100 to300 persons. The crops raised on sewage farms frequently pay the. Fig. 124.—Triple Contact Beds at Hampton, England. expenses of operation, but seldom pay the interest on the investmentexcept in arid regions, where irrigation is profitable. Broad irrigation,cannot be successfully used
. Preventive medicine and hygiene. Fig. 123.—Chemical Precipitation Plant at Wohcester, Mass., Outlet. farms of Berlin and Paris are very extensive, the Berlin farms coveringnearly 20,000 acres. The rate of application varies from 3,000 to 15,000gallons per acre daily, an acre serving for the sewage of from 100 to300 persons. The crops raised on sewage farms frequently pay the. Fig. 124.—Triple Contact Beds at Hampton, England. expenses of operation, but seldom pay the interest on the investmentexcept in arid regions, where irrigation is profitable. Broad irrigation,cannot be successfully used with clayey soils. The purification obtainedis usually very satisfactory, both choniieally and l)acteriologically. 968 SEWAGE DISPOSAL IxTEEMiTTEXT Saxd Filtratiox.—With this method the sewage isapplied intermittently to beds of sand, especially prepared for the pur-pose, in such quantities that it quickly soaks away, leaving the bed ex-posed to the air for a period of several hours or several days, thus givingopportunity for aeration and oxidation of the organic matter. Theresults obtained are usually very satisfactory, provided that the filters
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
