ON THE TKEATlIJiNT AND ITflLlZATlOX OV SICWAOE. 



Ill 



press, which will at once render the solid matter nearly dry enough to hum 

 into cement. 



On the whole this process, when perfected, promises well as a means of 

 treating one of the difficulties of the sewage question — the dispofral of the 

 sludge precipitated from sewage. It appears not only possible to des'roy 

 the solid matters by fire, but also to secure some return from their use in 

 the manufacture of cement. 



Bemarl-s on the Analyses of Sewage and Effluent Water from Ealing. 



Ealing sewage, upward-filtration process. Samples taken 5th and Cth Sep- 

 tember, 1871. 



]>f.B.— Samples taken every two hours during the day, in the proportion of t.Vt of the 

 flow per minute. Eesults given in parts per 100,000. 



Description of 

 samples. 



1 IJ c 



Sewage as it entered 



works 



Sewage as leaving 



preeipitating-tank . 

 Sewage after passing 



througli No. 1 filter 

 Sewage after passing 



through No. 2 alter 

 Sewage as it entered 



works 



Sewage from outfall 



after passing thro' 



filter 



< 



°F. 

 62-0 

 60-0 

 60-0 

 60'0 



Solid mattL-r. 



In solu- 

 tion. 



70-50 

 72-40 

 71-00 

 70-30 

 7i-60 



65-80 





lO-JO 



a-90 



16-70 

 lO-SO 

 39-60 



41-40 



In suspen- 

 sion. 



65-50 

 16-50 

 15-20 

 9-80 

 97-45 



20-70 



39-30 

 3-90 



12-28 

 U-86 



3-35 10-79 



3-10 

 35-50 



8-60 



9-73 

 10-37 



10-44 



Nitrogen. 



In solution. 



5-40 

 6-48 

 5-64 

 5-60 

 7-41 



6-76 



0-54- 

 0-76 

 1-16 



1-31 

 0-60 



5-94 



7-24 

 6-80 

 5-60 

 S-72 



7-35 



2-19 

 1-37 

 0-89 

 trace 

 4-42 



0-97 



a . 

 ,2 o 



6-1 c3 



8-13 

 S-81 

 7-69 

 5-60 

 13-14 



Bemarkj, 



Taken Sept. 5, when 



.deodorizing - mixture 



hid been added b' 



Local Board as usual 



Taken Sept. 6, when 

 no deodorizing-mix- 

 ture had been added 

 8-32 j J to sewage. 



Ealing sewage, General Scott's process. Samples taken March 26th to 



April 5th, 1872. 



N.B.— Samples taken every two hours during the day, in the proportion of -[uVd of Uie 

 flow per minute. Eesults given in parts per 100,000. 



From these analyses it will be seen that the upward-fi-ltration process, 

 whether accompanied or not by the previous addition of the deodorizing- 



