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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IV.—TABULATION OF THE RESULTS OF THE CHEMICAL EXAMINATION OF THE CRUDE SEWAGE, OF THE "CHEMICAL" EFFLUENT, AND OF THE
VARIOUS COKE- BED EFFLUENTS.
Date. | Average daily crude sewage. | Effluent from the chemically treated and sedimented sewage as supplied to the coke-bed ("chemical" effluent). | Effluent from the coke-bed. | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Oxygen absorbed from permanganate in 4 hours at 80° F. | Oxygen absorbed from permanganate in 4 hours at 80° F. | Oxygen absorbed from permanganate in 4 hours at 80° F. | Quantity of effluent from the chemically treated and sedimented sewage which was passed on to the coke-bed per month. Gallons. | Number of times the coke-bed was filled per month. | Average quantity of effluent which was passed on to the bed each time of filling. | ||||||||
By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dissolved putrescible matter.) | By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dissolved putrescible matter.) | Nitrous nitrogen. | Nitric nitrogen. | By the crude liquid. (Total putrescible matter.) | By the clear liquid. (Dissolved putrescible matter.) | Nitrous nitrogen. | Nitric nitrogen. | ||||
1900. | |||||||||||||
January | 11.145 | 5.526 | 6.629 | 4.957 | 0.0555 | 0.1430 | 0.890 | 0.723 | 0.0330 | 0.7605 | 23,356,361 | 52 | 449,161 |
February | 11.009 | 5.299 | 6.735 | 5.134 | 0.1271 | 0.0907 | 0.898 | 0.753 | 0.0362 | 1.0868 | 18,400,442 | 46 | 400,010 |
March | 11.910 | 6.658 | 7.526 | 6.074 | 0.0567 | 0.0936 | 0.998 | 0.866 | 0.0352 | 1.0071 | 18,354,936 | 52 | 352,980 |
April | 12.072 | 6.552 | 7.781 | 6.409 | 0.0181 | 0.0234 | 1.086 | 0.934 | 0.0439 | 1.2021 | 14,391,847 | 42 | 342,663 |
May | 12.123 | 6.239 | 6.678 | 5.022 | Nil | Nil | 0.972 | 0.840 | 0.0444 | 0.9490 | 17,015,411 | 52 | 327,219 |
June | 11.441 | 4.940 | 6.018 | 4.355 | 0.0022 | 0.0030 | 0.939 | 0.760 | 0.0542 | 0.9053 | 13,792,523 | 43 | 320,756 |
July | 10.848 | 4.663 | 6.136 | 4.203 | Nil | 0.0235 | 0.999 | 0.792 | 0.0501 | 0.6007 | 16,002,669 | 50 | 320,053 |
August | 10.989 | 4.719 | 7.019 | 3.974 | Nil | 0.0970 | 1.010 | 0.808 | 0.0502 | 0.8458 | 12,168,147 | 38 | 320,214 |
September | 11.384 | 5.014 | 6.997 | 5.106 | Nil | Nil | 1.029 | 0.840 | 0.0991 | 1.2353 | 15,823,348 | 46 | 343,986 |
October | 11.382 | 5.247 | 7.377 | 5.942 | 0.0004 | 0.0377 | 1.019 | 0.848 | 0.0691 | 1.3078 | 18,044,051 | 52 | 347,001 |
November | 12.056 | 5.766 | 7.417 | 6.175 | 0.0015 | Nil | 1.131 | 0.979 | 0.0743 | 1.3023 | 16,025,918 | 46 | 348,390 |
December | 12.281 | 5.908 | 7.989 | 6.650 | 0.0276 | 0.0935 | 1.083 | 0.942 | 0.0608 | 1.3347 | 15,630,440 | 44 | 355,237 |
Average for the year | 11.546 | 5.543 | 7.015 | 5.344 | 0.0245 | 0.0504 | 1.003 | 0.840 | 0.0541 | 1.0429 | 199,006,093 | 563 | 353,474 |
1901. | |||||||||||||
January | 12.440 | 6.579 | 8.010 | 6.785 | 0.0367 | 0.1020 | 1.023 | 0.919 | 0.0626 | 1.1776 | 18,413,046 | 52 | 354,097 |
February | 13.036 | 7.511 | 7.350 | 6.242 | 0.0358 | 0.1506 | 1.161 | 1.055 | 0.0872 | 1.3095 | 16,121,827 | 46 | 350,474 |
March | 12.684 | 6.557 | 7.760 | 6.573 | 0.0563 | 0.0755 | 1.126 | 1.039 | 0.0701 | 1.3298 | 16,924,070 | 50 | 338,481 |
April | 11.865 | 5.992 | 7.705 | 6.278 | 0.0230 | 0.0054 | 1.123 | 1.011 | 0.1004 | 1.1117 | 15,481,724 | 46 | 336,559 |
May | 11.745 | 5.898 | 7.366 | 5.927 | 0.0036 | 0.0090 | 1.158 | 1.029 | 0.1176 | 0.6283 | 16,558,407 | 50 | 331,168 |
June | 11.651 | 5.393 | 7.166 | 5.456 | Nil | Nil | 1.161 | 1.010 | 0.1016 | 0.7862 | 16,012,550 | 48 | 333,595 |
July | 10.897 | 4.780 | 5.847 | 4.248 | 0.0081 | Nil | 1.021 | 0.856 | 0.0718 | 0.7253 | 16,889,950 | 51 | 331,175 |
August | 10.578 | 4.501 | 5.921 | 3.965 | Nil | Nil | 1.009 | 0.845 | 0.0710 | 0.6797 | 15,972,684 | 48 | 332,764 |
September | 10.577 | 4.516 | 6.337 | 4.336 | Nil | Nil | 0.914 | 0.790 | 0.0637 | 1.0986 | 11,751,012 | 35 | 335,743 |
October | 11.703 | 5.615 | 7.431 | 5.376 | 0.0023 | Nil | 0.910 | 0.790 | 0.0685 | 0.6663 | 14,976,516 | 45 | 332,811 |
November | 12.135 | 6.282 | 7.732 | 5.841 | 0.0098 | 0.0154 | 0.952 | 0.821 | 0.0525 | 0.8259 | 16,405,221 | 50 | 328,104 |
December | 12.219 | 6.351 | 7.911 | 6.410 | 0.0456 | 0.0523 | 0.973 | 0.861 | 0.0741 | 1.1641 | 14,612,640 | 44 | 332,105 |
Average for the year | 11.793 | 5.825 | 7.219 | 5.649 | 0.0186 | 0.0346 | 1.045 | 0.920 | 0.0782 | 0.9513 | 190,119,647 | 565 | 336,495 |
Average percentage purification effected on the "chemical" effluent by the bacterial treatment during 1900 | 85.7 | 84.3 | |||||||||||
,, ,, ,, ,,1901 | 85.5 | 83.7 | |||||||||||
,, ,, ,, ,,1900-1 | 85.6 | 84.0 | |||||||||||
Average percentage purification effected on the crude sewage by the chemical and bacterial treatments combined during 1900 | 91.3 | 84.9 | |||||||||||
,, ,, ,, ,,1901 | 91.1 | 84.2 | |||||||||||
,, ,, ,, ,,1900—1 | 91.2 | 84.5 |