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 VIII.— Averages of the figures relating to the rapid Sedimentation of Crude Sewage
at the Southern Outfall Works. (Series III.)
All quantities, except where otherwise stated, are expressed in parts per 100,000.
| Date. | Solids in suspension. | Oxygen absorbed from permanganate in 4 hours at 80° Fahr. | Nitrous nitrogen | Nitric nitrogen. | Solids in suspension. | Oxygen absorbed from permanganate in 4 hours at 80° Fahr. | Nitrous nitrogen. | Nitric nitrogen. | ||
|---|---|---|---|---|---|---|---|---|---|---|
| By the crude sewage. (Total putreacible matter.) | By the clear sewage. (Diesolved putrescible matter.) | By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dissolved putrescible matter.) | |||||||
| 1900. | ||||||||||
| November | 26.9 | 5.337 | 4.124 | Nil | Nil | 12.4 | 4.726 | 3.913 | Nil | Nil |
| December | 22.0 | 4.871 | 4.066 | Nil | Nil | 10.8 | 4.470 | 3.995 | Nil | Nil |
| Average for 1900 | 24.3 | 5.088 | 4.093 | Nil | Nil | 11.5 | 4.589 | 3.957 | Nil | Nil |
| 1901. | ||||||||||
| January | 27.0 | 4.907 | 4.060 | 0.0015 | Nil | 14.4 | 4.288 | 3.868 | 0.0121 | Nil |
| February | 37.1 | 6.583 | 4.241 | 0.0033 | Nil | 12.0 | 5.439 | 4.411 | 0.0162 | 0.0029 |
| March | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... |
| April | 14.9 | 6.554 | 4.619 | Nil | Nil | 10.8 | 6.160 | 4.617 | Nil | Nil |
| May | 23.1 | 6.630 | 4.685 | Nil | Nil | 14.3 | 6.199 | 4.750 | Nil | Nil |
| June | 34.2 | 7.944 | 4.562 | Nil | Nil | 17.9 | 6.809 | 4.730 | Nil | Nil |
| July | 28.8 | 6.539 | 3.918 | Nil | Nil | 14.5 | 5.469 | 3.997 | Nil | Nil |
| August | 23.8 | 5.118 | 3.236 | Nil | Nil | 12.8 | 4.517 | 3.373 | Nil | Nil |
| September | 20.4 | 5.099 | 3.517 | Nil | Nil | 23.1 | 4.521 | 3.455 | Nil | Nil |
| October | 28.5 | 5.080 | 3.442 | Nil | Nil | 17.7 | 4.655 | 3.697 | Nil | Nil |
| Average for 1901 | 27.0 | 6.142 | 4.087 | 0.0006 | Nil | 14.1 | 5.377 | 4.133 | 0.0038 | 0.0004 |
| Average for the whole period | 26.5 | 5.936 | 4.088 | 0.0005 | Nil | 13.6 | 5.223 | 4.098 | 0.0031 | 0.0003 |
| Average percentage purification of the crude sewage during the whole period | 48.7 | 12.0 | -0.24 | |||||||