ON THR TREATMENl! AND UTILIZATION OF SsEWAtJE. 



225 



Eighth Report of the Committee on the Treatment and Utilization of 

 Sewage, reappointed at Bristol, 1875^ and consisting of Richard 

 B. Grantham (Chairman), C.E., F.G.S., Professor A. W. Wil- 

 liamson, F.R.S., Dr. Gilbert, F.R.S., Professor Corfield, M.A., 

 M.D., William Hope, V.C, F. J. Bramavell, C.E., F.R.S., and 

 J. Wolfe Barry, C.E. 



YouE Committee have duriug the past year, ending 24th March, 1S76, been 

 able to conduct more complete observations at Breton's Farm, near Romford, 

 and have been also able to test experimentally the value of last year's obser- 

 vations by having analyses made of samples of sewage and effluent water 

 kept under various conditions. The expense attending this year's experi- 

 ments has been generously borne by a Member of the Association. 



From Table I. it appears that the quantity of sewage received from the 

 town was greater than in any year during the period over which the Com- 

 mittee's observations extend, not excepting the year 1872-73, when the rain- 

 fall was larger by 3 inches than this year ; it is therefore clear that the quan- 

 tity of sewage proper received from the town has increased steadily year by 

 year, thus : — 



Year. 



Sewage. 



Eaiufall. 



1870-71. i tons. 



June li to July 1 5. 1 583,936 



(399 '•ap). ! 



I 



1871-71. ; . . 



March 25 to Moroli 24. 416.787 



1872-73. : 



Sfarch to Mareli. : 479.941 



1873-74- 

 I Marcli to Marcli. not gauged. 



j 1874-75- 



March to March. 482,335 



I ■ i 



t 1875-76. * 



I March to March. ! 546,982 



inches. 

 22-64 



2i*56 

 2989 

 not gauged. 

 1979 

 ■-^675 



It should be observed again that, as stated in last year's Report, it has not 

 been possible during the past two years to gauge the sewage directly in the 

 distributing-trough, and so the amount is calculated as follows: — the "day" 

 sewage from gaugings taken in the sewers during the working hours of the 

 engine, and the "night" sewage from the difference in the contents of the 

 tanks at the times of stopping and starting the engines night and morning. 



It is worthy of note that while the weekly average of the noonday atmo- 

 8i)heric temperatures varied from 31° to 79°rahr., the average temperatures 

 of the sewage only varied from 55° to 70° Fahr. 



Table II, is given again after a lapse of two years, during which it was 

 impossible for want of funds to have a sufticicnt number of analj'ses made. 



1876. a 



