144 



Mr. Harry Grimshaw on the 



Monday to about 6 p.m. on the Saturday the waste water 

 from manufactories amounts to nearly one half of the total 

 volume of sewage. 



The general results of the preliminary experiments are 

 indicated in the following table, showing the results of 

 treatment during the month of December, 1892. . 



Table I. r 



Salford Sewage and Effluents, after treatment with Basic Per- 

 sulphate of Iron. 100,000 gallons treated daily with 15 grains 

 per gallon. Results expressed in parts per 100,000 of Albu- 

 menoid Ammonia. 





W 





(3) 



(4) 



Per Cent. 



Per Cent. Per 



Cent. 



Date 



1892. 



Crude 

 Sewage 



(2) 



Effluent 



Effluent 

 Filtered 



Effluent 

 Filtered 



of 

 Purifica- 



of i 

 Purifica- Pur 



if 



ifica- 



12 hours 



Unfiltered. 



Sand. 



Ozonite. 



tion. 



tion. ti 



on. 





settling. 









(2) 



(5) ( 



4) 



Nov. 28 



roo 



. 0-40 



0-30 





60 



70 



„ 29 



080 



•42 



•35 





47 



55 





„ 30 



o75 



•40 



•29 





47 



61 





Dec. 1 



75 



•31 



•22 





59 



70 





,, 2 



•56 



•28 



•16 





5° 



73 





•>•> 3 



•90 



•28 



•19 





69 



89 





,, 4 



•85 



•35 



•25 





60 



70 





„ 5 



•60 



•30 



•17 





5° 



7i 





„ 6 



71 



•30 



•17 





S l 



76 





„ 7 



75 



•32 



•22 





56 



7i 





„ 8 



•60 



•30 



•15 





5° 



75 





,, 9 



•65 



•30 



•16 





5 



75 





,, n 



•59 



•28 



•15 





53 



73 





,, 12 



•65 



•30 



•l8 





54 



72 





„ 13 



70 



•30 



•21 



0-18 



57 



73 



74 



„ 14 



•51 



•25 



•19 



o'i35 



50 



64 



73 



,, 15 



•51 



•25 



•19 



•16 



50 



62 < 



39 



,, 16 



•52 



•26 



•20 



•16 



50 



61 



72 



„ 17 



•62 



•28 



•19 



•15 



55 



70 



75 



,, 20 



•51 



•20 



•19 



•145 



60 



64 : 



71 



,, 21 



•60 



•26 



•19 



•15 



56 



70 • 



75 



,, 22 



•60 



•26 



•21 



•18 



56 



65 : 



71 



„ 23 



'57 



•24 



•l8 



•16 



60 



68 ; 



72 



„ 24 



•60 



•23 



•17 



•14 



60 



70 j 



76 



Average 



0-63 



0-29 



CT20 



0-15 



55 



68 : 



7 3 



Note. — The Crude Sewage, column No. I, was allowed to settle 12 hours before 

 analysis. 

 The Effluents, Nos. 2, 3, and 4 were shaken up before analysis. 



