I would also refer you to a paper recently read before the Manchester Section of this Society by Mr Carter Bell, the borough analyst for Salford, in whose remarks Dr. Burghardt, an independent authority, permits me to add that he concurs. He cannot give details until his report has gone in, which will be very shortly.
Mr. Carter Bell's report has gone in, and although he is precluded also from giving full details, he has kindly put at my disposal samples sealed by him of the effluents produced by the electrical treatment, which I now submit, together with the analyses in the table.
The samples are taken at random.
Whether the process will or will not be adopted by the Salford authorities I am of course unable to say, but I think I may safely say that the electrical process has now absolutely proved its case in regard to the solution of the sewage problem. It is simple, efficient and, I am sure, more economical than any other known process where duration is taken into account.
In regard to the Salford trials it may be interesting to give the following particulars:
______________________________________________________________________
|
| Parts in 100,000.
|________________________________________________
| | | |
| May 15. | June 7. | June 30. | July 25.
|_____________|___________|___________|__________
|Not filtered.| | |
Total solids. | 109 | 125 | 141 | 132
Loss on ignition. | 33 | 21 | 29 | 23
Chlorine. | 32 | 44 | 42 | 43
Oxygen required | | | |
for 15 minutes. | 2.56 | 0.76 | 0.27 | 0.79
Oxygen required | | | |
for three hours. | 4.27 | 0.79 | 0.50 | 1.00
Free ammonia. | 2.20 | 0.88 | 0.50 | 0.92
Albuminoid am- | | | |
monia. | 0.32 | 0.17 | 0.092 | 0.19
_____________________|_____________|___________|___________|__________
The electrical shoot was built in brick and contained 28 cells arranged in series.
Each cell contained 13 cast iron plates 4 in. × 2 ft. 8 in. × ½ in. thick connected in parallel.
The available electrode surface in each cell was 256 sq. ft.
The ampere hour treatment required for Salford was found to be about 0.37 ampere hours per gallon, and the I.H.P. per million gallons based on these figures would be 37.