Igiene pratica; un manuale per gli ispettori sanitari e altri;con apxon Diritto sanitario, da Herbert Manley . es in una serie di bracci radianti, B,con aperture lungo le loro sotto la superficie attraverso la quale essa isdischarged in modo tale da provocare come poco aspossible agitazione delle acque reflue già nel serbatoio. La comparativa 10 146 pratico igiene. quiescenza del liquame nel serbatoio consente di sostanze precipitanti toact, e l'azione è intensificata hy il liquame in entrata havingto passare verso l'alto attraverso il fango che ha già formedand è la sedimentazione, e che agisce come un filtro meccanico,

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Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . es in a series of radiating arms, B, with openings along their under surface through which it isdischarged in such a manner as to cause as little agitation aspossible of the sewage already in the tank. The comparative 10 146 PRACTICAL SANITATION. quiescence of the sewage in the tank allows the precipitants toact, and the action is intensified hy the incoming sewage havingto pass upwards through the sludge which has already formedand is settling, and which acts as a mechanical filter, and by thetime it reaches the outflow pipe, C, very satisfactory clarification has been effected.By means of a pipe, D, which reaches tothe bottom of thetank, the sludge israised, and this pro-cess can go on whilethe crude sewagecontinues to enterthe tank, indeed, ifsufficient fall is avail-able, it can be con-ducted automaticallyby the following ar-rangement:—It willbe noticed that thesludge-pipe, D, leavesthe tank at a lowerlevel than the effluentoutgo, consequently, the pressure exer-cised by the weight. Fig. 89. of sewage above the outgo of the sludge-pipe suffices to raise thesludge from the bottom of the tank in a continuous stream. Ifthe fall will not allow of the sludge-pipe being taken off at alower level than the effluent outflow pipe, the sludge must beraised by means of a pump. In any case it is necessary toprovide a pump in order to allow of the emptying of the tankboth of sewage and sludge when occasion requires. The International Sewage Purification Company have designeda similar tank, with the exception that the bottom in place ofbeing cone-shaped, is flat, and close to the bottom there are aseries of revolving rakes which are worked either by hand or bysteam power according to the size of the tank, the object beingto prevent the sludge from clogging. At the same time, thosewho have had considerable experience of the working of theIves tank maintain that no suc

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectsanitat
• bookyear1904