Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
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2.—CROSSNESS RESULTS.
Table 8.—Details of the Analytical Results obtained from the Crude Sewage and the Effluent
from the Bacterial Beds.
Date. | Crude sewage. | Coke-bed effluent. | |||||
---|---|---|---|---|---|---|---|
Number of fillings per day. | Oxygen absorbed from permanganate in four hours by the dissolved putrescible matter. | Nitrogen as | Oxygen absorbed from permanganate in four hours by the dissolved putrescible matter. | Nitrogen as | |||
Nitrite. | Nitrate. | Nitrite. | Nitrate. | ||||
1899. | |||||||
Feb. 27 | One | 3.039 | Nil | Nil | 1.614 | 0.014 | Trace |
28 | „ | 4.300 | „ | „ | 2.500 | Trace | „ |
Mar. 1 | „ | 2.600 | „ | „ | 1.500 | Nil | Nil |
2 | „ | 3.418 | „ | „ | 1.827 | 0.007 | 0.030 |
3 | „ | 4.620 | „ | „ | 2.815 | Trace | Nil |
4 | „ | 2.942 | „ | „ | 1.629 | Nil | „ |
6 | „ | 3.511 | „ | „ | 2.021 | 0.014 | Trace |
7 | „ | 2.766 | 0.021 | „ | 1.915 | 0.070 | „ |
8 | „ | 2.872 | Trace | „ | 0.958 | 0.084 | 0.052 |
10 | „ | 3.191 | Nil | „ | 1.489 | Nil | 0.095 |
11 | „ | 3.085 | „ | Trace | 1.489 | 0.021 | 0.040 |
13 | „ | 3.737 | 0.014 | Nil | 1.212 | 0.021 | 0.110 |
14 | „ | 2.525 | Nil | Trace | 0.999 | Trace | 0.037 |
15 | „ | 2.632 | „ | Nil | 0.947 | Nil | Trace |
16 | „ | 3.263 | „ | „ | 1.158 | „ | 0.077 |
17 | „ | 2.947 | „ | „ | 1.158 | 0.021 | Trace |
18 | ” | 3.158 | „ | 1.370 | 0.035 | 0.136 | |
20 | „ | 2.604 | „ | „ | 1042 | 0.070 | Trace |
21 | „ | 4.271 | „ | „ | 1.562 | 0.014 | 0143 |
22 | „ | 6.459 | Trace | „ | 3.125 | 0.021 | 0.083 |
23 | „ | 3.263 | 0.007 | „ | 1.369 | 0.014 | 0.071 |
24 | „ | 4.062 | Nil | „ | 1.770 | 0.007 | 0.128 |
26 | „ | 2.917 | „ | „ | 1.042 | 0.021 | 0.114 |
27 | Two | 3.036 | Trace | „ | 1.518 | Nil | 0.142 |
28 | „ | 3.482 | Nil | „ | 1.875 | 0.021 | Nil |
29 | „ | 2.679 | „ | „ | 1.429 | 0.007 | 0.109 |
April 4 | „ | 3.100 | „ | „ | 1.400 | 0.042 | Trace |
5 | „ | 2.000 | „ | „ | 1.200 | 0.014 | 0.123 |
6 | „ | 3.200 | Trace | „ | 1.800 | Nil | 0.038 |
7 | „ | 2.800 | 0.028 | 0.011 | 1.400 | 0.007 | 0.080 |
8 | One | 2.700 | Nil | Nil | 1.500 | 0.014 | 0.078 |
10 | Two | 3.725 | 0.014 | „ | 1.961 | 0.007 | 0.056 |
11 | „ | 3.039 | Nil | „ | 1.470 | 0.014 | 0.213 |
12 | „ | 4.314 | Trace | „ | 2.568 | 0.070 | 0.044 |
13 | „ | 2.451 | 0.007 | Trace | 1.372 | Nil | 0.081 |
14 | „ | 3.921 | Nil | Nil | 2.451 | 0.014 | 0.060 |
15 | One | 3.137 | 0.021 | „ | 1.862 | 0.014 | 0.138 |
17 | „ | 4.301 | Nil | „ | 2.680 | 0.028 | 0.136 |
18 | Two | 3.824 | 0.007 | Trace | 2.680 | 0.014 | 0.054 |
19 | „ | 2.574 | Trace | Nil | 1.453 | 0.042 | 0.285 |
20 | „ | 5.247 | Nil | „ | 3.014 | Nil | Trace |
21 | „ | 4.444 | „ | „ | 2.525 | 0.014 | 0.184 |
22 | One | 4.646 | 0.021 | „ | 3.030 | 0.007 | 0.253 |
24 | Two | 3.878 | 0.028 | Trace | 2.245 | 0.014 | 0.210 |
25 | „ | 2.653 | Trace | Nil | 1.617 | Trace | Trace |
26 | „ | 2.842 | Nil | „ | 1.789 | Nil | 0.322 |
27 | „ | 2.857 | „ | Trace | 1.667 | 0.021 | 0.148 |
28 | „ | 4.742 | 0.007 | 0.034 | 2.755 | 0.056 | 0.180 |
29 | One | 3.542 | 0.007 | Nil | 2.371 | 0.042 | Trace |
May 1 | Two | 2.846 | 0.014 | „ | 1.579 | Trace | 0.170 |
2 | „ | 2.340 | Nil | „ | 1.474 | 0.070 | 0.094 |
3 | „ | 3.298 | „ | „ | 1.959 | 0.021 | 0.208 |
4 | „ | 4.480 | „ | „ | 2.660 | Nil | 0.045 |
5 | One | 3.830 | Trace | „ | 2.340 | 0.007 | 0.241 |
6 | „ | 3.300 | 0.007 | Trace | 1.800 | 0.014 | Trace |
8 | Two | 4.216 | Nil | „ | 2.451 | Nil | 0.180 |
9 | „ | 3.301 | „ | Nil | 1.863 | Trace | 0.094 |
10 | „ | 2.277 | „ | „ | 1.078 | 0.056 | 0.231 |
11 | „ | 2.784 | „ | „ | 1.443 | 0.070 | Trace |
12 | One | 3.299 | „ | „ | 1.735 | 0.014 | Nil |
13 | „ | 2.143 | „ | „ | 1.237 | 0.028 | 0.113 |
15 | Two | 3.535 | „ | „ | 1.919 | 0.023 | Nil |
16 | „ | 4.124 | „ | „ | 2.755 | Trace | „ |
17 | „ | 2.300 | „ | „ | 1.400 | 0.007 | 0.204 |
18 | „ | 3.800 | 0.035 | „ | 2.000 | 0.098 | 0.046 |
19 | „ | 1.700 | Nil | „ | 0.800 | 0.021 | 0.133 |
24 | „ | 4.255 | „ | „ | 2.553 | 0.042 | 0.320 |
25 | „ | 3.298 | „ | „ | 1.702 | 0.070 | 0.055 |
26 | „ | 2.826 | „ | „ | 1.277 | 0.070 | 0.121 |
27 | One | 2.766 | „ | „ | 1.596 | 0.084 | 0.219 |
29 | Two | 2.632 | 0.014 | „ | 1.579 | 0.035 | 0.147 |