London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
London County Council 1900
[Report of the Medical Officer of Health for London County Council]
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Table IX.— Averages of the Figures relating to the Treatment of rapidly Sedimented Sewage in Coke-beds at the Southern Outfall Works. (Series III.)
All quantities, except where otherwise stated, are expressed in parts per 100,000.
| Date. | Oxygen absorbed from permanganate in 4 hours at 80o Fahr. | Nitrous nitrogen. | Nitric nitrogen. | Oxygen absorbed from permanganate in 4 hours at 80° Fahr. | Nitrous nitrogen. | Nitric nitrogen. | ||
|---|---|---|---|---|---|---|---|---|
| By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dssol ved putrescible matter.) | By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dissolved putrescible matter.) | |||||
| 1900. | ||||||||
| November | 4.993 | 3.673 | Nil | Nil | 4.881 | 3.710 | Nil | Nil |
| December | 4.472 | 3.664 | 0.0013 | Nil | 4.519 | 3.618 | 0.0010 | 0.0029 |
| Average for 1900 | 4.715 | 3.668 | 0.0007 | Nil | 4.688 | 3.661 | 0.0006 | 0.0016 |
| 1901. | ||||||||
| January | 4.596 | 4.021 | 0.0041 | Nil | 4.625 | 3.956 | 0.0025 | 0.0058 |
| February | ||||||||
| March | ||||||||
| April | 6.106 | 4.375 | Nil | Nil | 6.058 | 4.385 | 0.0037 | Nil |
| May | 6.192 | 4.223 | Nil | Nil | 6.169 | 4.394 | Nil | Nil |
| June | 6.548 | 4.151 | 0.0011 | Nil | 6.438 | 4.276 | Nil | Nil |
| July | 5.350 | 3.599 | Nil | Nil | 5.274 | 3.603 | 0.0009 | Nil |
| August | 4.776 | 3.220 | Nil | Nil | 4.590 | 3.243 | 0.0011 | Nil |
| September | 4.519 | 3.382 | 0.0008 | Nil | 4.593 | 3.274 | 0.0017 | Nil |
| October | 4.264 | 3.025 | Nil | Nil | 4.586 | 3.213 | Nil | Nil |
| Average for 1901 | 5.430 | 3.802 | 0.0007 | Nil | 5.390 | 3.835 | 0.0012 | 0.0006 |
| Average for the whole period | 5.263 | 3.771 | 0.0007 | Nil | 5.232 | 3.794 | 0.0010 | 0.0008 |
| 1900. | ||||||||
| November | 2.592 | 1.987 | 0.0044 | 0.0253 | 2.505 | 1.930 | 0.0258 | 0.1168 |
| December | 2.052 | 1.683 | 0.0412 | 0.0770 | 2.048 | 1.643 | 0.0256 | 0.0586 |
| Average for 1900 | 2.303 | 1.825 | 0.0251 | 0.0543 | 2.261 | 1.776 | 0.0257 | 0.0841 |
| 1901. | ||||||||
| January | 3.412 | 2.916 | 0.0469 | 0.0696 | 3.052 | 2.600 | 0.0472 | 0.0971 |
| February | ||||||||
| March | ||||||||
| April | 3.144 | 2.407 | 0.2177 | 0.1215 | 3.202 | 2.420 | 0.1809 | 0.1576 |
| May | 2.688 | 1.970 | 0.0765 | 0.0261 | 2.852 | 2.136 | 0.0784 | 0.0539 |
| June | 2.678 | 1.764 | 0.0843 | 0.0389 | 2.925 | 2.037 | 0.0767 | 0.0330 |
| July | 1.922 | 1.405 | 0.0691 | 0.0340 | 1.917 | 1.411 | 0.0757 | 0.0393 |
| August | 2.165 | 1.547 | 0.0527 | 0.0403 | 2.052 | 1.513 | 0.0403 | 0.0466 |
| September | 2.144 | 1.672 | 0.0964 | 0.0417 | 2.217 | 1.635 | 0.0121 | 0.0862 |
| October | 1.700 | 1.336 | 0.2270 | 0.0462 | 1.736 | 1.400 | 0.2145 | 0.0640 |
| Average for 1901 | 2.489 | 1.858 | 0.0904 | 0.0477 | 2.516 | 1.887 | 0.0892 | 0.0663 |
| Average for the whole period | 2.445 | 1.0850 | 0.0757 | 0.0492 | 2.456 | 1.861 | 0.0749 | 0.0703 |
| Average percentage purification of the crude sewage during the whole period. | 58.8 | 54.7 | 58.6 | 56.8 | ||||