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 1899
[Report of the Medical Officer of Health for London County Council]
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Table 7—(
| Date, 189&. | Sewage chemically treated and sedimented as supplied to the coke.bed. | Coke.bed effluent. | Quantity treated. Gallons. | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Oxygen absorbed from permanganate in four hours. | Nitrogen as | Oxygen absorbed from permanganate in four hours. | Nitrogen as | ||||||
| By the total oxidisable matter. | By the dissolved oxidisable matter. | Nitrite. | Nitrate. | By the total oxidisable matter. | By the dissolved oxidisable matter. | Nitrite. | Nitrate. | ||
| 1899. | |||||||||
| Dec. 12 | 6.000 | 5.400 | Nil | 0.1172 | 0.740 | 0.700 | 0.0420 | 0.5473 | 454,750 |
| 444,050 | |||||||||
| ” 13 | 6.300 | 5.600 | ” | Trace | 0.720 | 0.680 | 0.0350 | 0.2110 | 422,564 |
| 449,400 | |||||||||
| ” 14 | 5.200 | 4.900 | ” | 0.2975 | 0.708 | 0.669 | 0.0420 | 0.3710 | 454,750 |
| 438,700 | |||||||||
| ” 15 | 4.900 | 4.300 | 0.0560 | 0.1300 | 0.660 | 0.583 | 0.0420 | 0.2547 | 422,564 |
| 438,700 | |||||||||
| ” 16 | 3.400 | 1.900 | Nil | 0.2493 | 0.349 | 0.349 | 0.0420 | 0.3236 | 454,750 |
| ” 18 | 4.000 | 3.600 | 0.0560 | 0.0616 | 0.543 | 0.436 | 0.0420 | 0.2519 | 454,750 |
| 454,750 | |||||||||
| ” 19 | 4.300 | 3.400 | 0.0560 | 0.1808 | 0.485 | 0.405 | 0.0420 | 0.4155 | 438,700 |
| 454,750 | |||||||||
| ” 20 | 5.000 | 4.200 | 0.0560 | 0.0041 | 0.663 | 0.485 | 0.0350 | 0.3874 | 440,050 |
| 454,750 | |||||||||
| ” 21 | 5.200 | 4.000 | 0.0560 | 0.0546 | 0.574 | 0.465 | 0.0420 | 0.2688 | 454,750 |
| 454,750 | |||||||||
| ” 22 | 6.100 | 5.500 | 0.0420 | 0.1978 | 0.841 | 0.742 | 0.0280 | 0.3335 | 440,050 |
| ” 27 | 6.100 | 4.900 | 00490 | 0.0710 | 0.723 | 0.523 | 0.0700 | 0.5400 | 406,974 |
| 454,750 | |||||||||
| ” 28 | 5.800 | 4.900 | 0.0560 | 0.0558 | 0.628 | 0.48 | 0.0210 | 0.5332 | 454,750 |
| 454,750 | |||||||||
| ” 29 | 5.300 | 4.300 | 0.0420 | 0.069 | 0.828 | 0.666 | 0.0140 | 0.4425 | 454,750 |
| 444,050 | |||||||||
| ” 30 | 4.300 | 2.900 | Nil | 0.1167 | 0.543 | 0.467 | 0.0280 | 0.3802 | 454,750 |
Averages.
| Date. | Oxygen absorbed from permanganate in 4 hours. | Nitrogen as | Oxygen absorbed from permanganate in 4 hours. | Nitrogen as | Remarks. | ||||
|---|---|---|---|---|---|---|---|---|---|
| By the total oxidisable matter. | By the dis[???]ved oxidisable matter. | Nitrite. | Nitrate. | By the total oxidisable matter. | By the dissolved oxidisable matter. | Nitrite. | Nitrate. | ||
| 1898 | One filling. | ||||||||
| May 12-May 23 | 3.039 | 0.623 | |||||||
| May 25-July 2 | 2.655 | Nil | 0.0059 | 0.509 | 0.0252 | 0.1145 | |||
| July 4-July 29 | 2.877 | Nil | 0.0061 | 0.624 | 0.0221 | 0.0615 | Two fillings. | ||
| Nov. 8-Nov. 19 | 5.045 | 3.525 | Nil | 0.1114 | 1.018 | 0.567 | 0.0474 | 0.6738 | One filling. |
| 1899 | |||||||||
| Nov. 21-Jan. 21 | 5.465 | 4.108 | 00610 | 0.0594 | 1.183 | 0.613 | 0.0321 | 0.3979 | Two fillings. |
| 1899 | |||||||||
| Jan. 23-Mar. 11 | 3.987 | 00396 | 0.0783 | 0.665 | 0.0233 | 0.2407 | |||
| May 8-Oct. 17 | 2.976 | 00003 | 0.1814 | 0.574 | 0.0308 | 0.7118 | Two fillings after firstthreeweeks. | ||
| Oct. 18-Dec. 30 | 4.443 | 3.393 | 0.0291 | 0.1411 | 0.642 | 0529 | 0.0290 | 0.3483 | |
| 1898 | |||||||||
| May 12-Julv 2 | 2.726 | Nil | 0.0059 | 0.530 | 0.0252 | 0.1145 | One filling. | ||
| 1899 | |||||||||
| Nov. 21-Mar. 11 | 5.465 | 4.057 | 0.0518 | 0.0683 | 1.183 | 0.635 | 0.0283 | 0.3300 | Two fillings. |
| 1899 | |||||||||
| May 8-Dec. 30 | 4.443 | 3.109 | 0.0095 | 0.1686 | 0.643 | 0.560 | 0.0302 | 0.5963 | |
| 1898 1899 May 12-Dec. 30 | 4.921 | 3.306 | 0.0186 | 0.1158 | 0.900 | 0.580 | 0.0294 | 0.4531 | Whole period. |
| Percentage Purification. | |||||||||
| 1898 | |||||||||
| May 12-July 2 | 80.5 | ||||||||
| 1899 | |||||||||
| Nov. 21-Mar. 11 | 78.4 | 84.3 | |||||||
| 1899 May 8-Dec. 30 | 85.5 | 82.0 | |||||||