Lectures. Water supply, sewerage and sewage utilization, Volumen68 |
Términos y frases comunes
acid allowed ammonia amount aqueduct average becomes bottom brought built called carbonic carried cause certain cisterns closets collected comes consider considerable constructed contains course covered depth dissolved drain drinking water earth engine especially extent fact fall farm feet filter filtration gallons give given greater ground hardness important inches instance iron known land less lime London lower means mention miles necessary nitrogen once organic matter pass perfectly pipes possible precipitate prevent pumped pure purified quantity rain reason refuse matters regard removed require reservoir river Roman salts sand scale sewage sewers side soil solution sort springs stream substances sufficient surface syphons taken tanks tell thing town trap valve ventilating waste water supply whole
Pasajes populares
Página 8 - ... organic matter was removed by the process of oxidation, the quantity left might be quite sufficient to be injurious to health. With regard to the oxidation, we know that to destroy organic' matter the most powerful oxidizing agents are required ; we must boil it with nitric acid and chloric acid and the most perfect chemical agents. To think to get rid of organic matter by exposure to the air for a short time is absurd...
Página 8 - ... per cent, of sewage, we are led in each case to the inevitable conclusion, that the oxidation of the organic matter in sewage proceeds with extreme slowness, even when the sewage is mixed with » large volume of unpolluted water, and that it is impossible to say how far such water must flow before the sewage matter becomes thoroughly oxidized.
Página 8 - ... mixed with fresh water and violently agitated in contact with air, or, finally, the rate at which dissolved oxygen disappears in water polluted with 5 per cent, of sewage, we are led in each case to the inevitable conclusion that the oxidation of the organic...
Página 11 - ... coal-gas and the effluvia of neighbouring sewers, which are absorbed by the water on its re-admission. In order however, that the system of Constant service may be carried out with efficiency and economy, it is necessary that the diameters of the pipes should be carefully adapted to their discharge and to the elevation of the district which they are to supply, and that the town should be sufficiently provided with town reservoirs. When these conditions are not fulfilled, it may be indispensable...
Página 5 - ... (that is a point I have referred to as one of considerable importance), "so that if a pipe became ruptured when in use the water would escape into the embankment, and if it found its way to the back of the puddle, the embankment would be torn down, and the whole of the water in the reservoir set free. It was not, therefore, desirable that large pipes should be laid under an embankment, where they would be subject to a considerable pressure of earth.
Página 7 - There is no process practicable on a large scale by which that noxious material (sewage matter) can be removed from water once so contaminated, and therefore I am of opinion that water which has been once contaminated by sewage or manure matter is henceforth unsuitable for domestic use.