The Bacterial Treatment of Sewage a Handbook for Councillors Engineers And Su
The Bacterial Treatment of Sewage a Handbook for Councillors Engineers And Su
George Thudichum
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I shall deal later with some of these special distributors, but with Sutton beds they need not be further considered. Heating apparatus, I think, should be entirely condemned. In the first place, it is not needed when bacteria beds are used, since the temperature is kept constantly elevated naturally, as in a hot bed. Secondly, the expense of warming any considerable volume of sewage is quite prohibitive. This, of course, can be readily demonstrated by a simple calculation. A first-class steam ...coal yields 15, 000 heat units per pound, i. E. , one pound of coaL = -SMeBQsing the whole heat of 22 combustion could be utilised, will raise i5, ooo-lbs. Of water i degree Fahrenheit. To raise the tem- perature of i million gallons of sewage 10 degrees would require a coal value equal theoretically to about 3 tons. But in actual practice only a portion of this could be really used, say 25 per cent ; the daily coal consumption would therefore be 12 tons. Let us imagine this applied to London : 200 million gallons a day at 12 tons of coal per million gives a yearly coal requirement of 876, 000 tons.
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