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 X.— Particulars as to the Disappearance of Sludge in the Settling-tank at the
Southern Outfall Works. (Series III.)
| During the period from November 1st, 1900, to March 28th, 1901. | During the period from March 29th, 1901,to October 5th, 1901. | During the whole period from November 1st, 1900, to October 5th, 1901. | |||
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | ||
| Quantity of crude sewage supplied to the settling tank gallons | 2,768,160 | 2,427,250 | 5,195,410 | ||
| Average amount of suspended solid's in the crude sewage | parts per 100,000 | 28.1 | 25.3 | ||
| grains per gallon | 19.7 | 17.7 | |||
| Weight of suspended solids supplied to the tank | Mineral constituents of solids lbs. | 3,241 | 2,553 | 5,794 | |
| Organic constituents of solids lbs. | 4,549 | 3,584 | 8,133 | ||
| Total solids lbs. | |||||
| 7,790 | 6,137 | 13,927 | |||
| Quantity of settled sewage which passed out of the settling tank gallons | 2,765,548 | 2,427,593 | 5,193,142 | ||
| Average amount of suspended solids in the settled sewage | parts per 100,000 | 12.5 | 14.3 | ||
| grains per gallon | 8.8 | 10.0 | |||
| Weight of suspended solids which passed out of the tank | Mineral constituents of solids lbs. | 1,406 | 1,418 | 2,824 | |
| Organic constituents of solids lbs. | 2,031 | 2,050 | 4,081 | ||
| Total solids lbs. | 3,437 | 3,468 | 6,905 | ||
| Actual quantity of sludge found in the tank gallons | 2,612 | 2,269 | 2,269 | ||
| Average amount of suspended solids in the sludge found in the tank percentage | 16.4 | ||||
| Weight of suspended solids in the sludge found in the tank | Mineral constituents of solids lbs. | 2,808 | |||
| Organic constituents of solids lbs. | 1,322 | ||||
| Total solids lbs. | 3,240 | 4,130 | |||
| Calculated quantity of sludge left in the tank | |||||
| Average amount of suspended solids removed from the sewage and left in the tank | parts per 100,000 | 15.6 | 11.0 | ||
| grains per gallon | 10.9 | 7.7 | |||
| Weight of suspended solids in the sludge left in the tank | Mineral constituents of solids lbs. | 1,835 | 1,135 | 2,970 | |
| Organic constituents of solids lbs. | 2,518 | 1,534 | 4,052 | ||
| Total solids lbs. | 4,353 | 2,669 | 7,022 | ||
| Quantity of sludge (organic matter only) which disappeared by the septic action in the tank lbs. | 1,113 | 2,892 | |||
| Percentage quantity of sludge which disappeared, calculated on total solids | 25.6 | 41.2 | |||
| Percentage quantity of sludge which disappeared, calculated on organic-constituents | 71.4 | ||||