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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Table 5.—(
Date. | Nitrogen as Nitrite in | Nitrogen as Nitrate in | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Crude sewage. | Coke.beds of Series A. | Coke.beds of Series B. | Crude sewage. | Coke.beds of Series A. | Coke.beds of Series B. | |||||
Primary Coarse Bed. | Secondary Coarse Bed. | Primary Coarse Bed | Secondary Fine Bed. | Primary Coarse Bed. | Secondary Coarse Bed. | Primary Coarse Bed | Secondary Fine Bed. | |||
1899. | ||||||||||
Oct. 2 | Nil. | 0.2100 | 0.0560 | 0.1820 | 0.0182 | 0.2431 | 1.0343 | 1.5156 | 1.0412 | 0.6947 |
3 | ” | 0.1680 | 0.0420 | 0.5600 | 0.0140 | 0.3503 | 1.9750 | 2.6961 | 0.9251 | 2.5524 |
4 | ” | 0.1400 | 0.1120 | 0.2100 | 0.0210 | 0.3499 | 2.2200 | 2.3530 | 0.3931 | 2.0846 |
5 | ” | 0.1400 | 0.0210 | 0.1260 | 0.0210 | 0.2053 | 1.3352 | 1.0798 | 2.3817 | 1.4421 |
6 | ” | 0.1400 | 0.0210 | 0.0820 | Nil | 0.4218 | 2.1900 | 2.2350 | 2.1775 | 2.2500 |
7 | ” | 0.0210 | 0.2800 | 0.0210 | 0.0280 | 0.3691 | 0.7216 | 0.9792 | 0.4841 | 1.5577 |
13 | ” | 0.1400 | 0.0210 | 0.2100 | 0.0140 | 0.2441 | 1.4467 | 2.1194 | 0.8775 | 1.1940 |
14 | ” | 0.0182 | 0.7000 | Nil | 0.0210 | 0.2317 | 1.8474 | 1.7881 | 0.8274 | 1.0501 |
16 | ” | 0.0420 | 0.0280 | 0.0350 | Nil | 0.2978 | 1.2051 | 1.8431 | 1.3311 | 1.5583 |
17 | ” | 0.0630 | 0.0280 | 0.1400 | 0.0140 | 0.3559 | 1.1960 | 0.9313 | 1.1892 | 0.9594 |
18 | ” | 0.0210 | 0.0420 | 0.0560 | 0.0140 | 0.1810 | 0.2205 | 0.7604 | 0.2456 | 1.7178 |
19 | ” | 0.1120 | 0.0280 | 0.0840 | 0.0140 | 0.2046 | 0.2530 | 1.0307 | 0.1188 | 3.0485 |
20 | ” | 0.1400 | 0.0210 | 0.1120 | 0.0182 | 0.2270 | 0.1693 | 0.9627 | 0.4228 | 2.8098 |
21 | ” | 0.0140 | 0.1400 | 0.0140 | 0.0350 | 0.2263 | 0.2289 | 0.5935 | 0.2289 | 1.8477 |
23 | ” | 0.0210 | 0.0420 | 0.0140 | 0.0210 | 0.2399 | 0.4105 | 0.7126 | 0.2955 | 1.6935 |
24 | ” | 0.0210 | 0.0280 | 0.0210 | 0.0280 | 0.2421 | 0.3438 | 0.8054 | 0.2760 | 2.1342 |
25 | ” | 0.0140 | 0.0700 | 0.0210 | 0.0350 | 0.0847 | 0.2280 | 0.8907 | 0.2282 | 2.3750 |
26 | ” | 0.1820 | 0.0280 | 0.0182 | 0.0420 | 0.1070 | 0.2196 | 0.9457 | 0.2834 | 1.6542 |
28 | ” | 0.0140 | 0.0560 | 0.0140 | 0.0350 | 0.0799 | 0.1653 | 0.3533 | 0.2135 | 0.9708 |
30 | ” | 0.0350 | 0.0140 | 0.0280 | 0.0140 | 0.0540 | 0.5816 | 1.2142 | 0.0773 | 1.5827 |
31 | ” | 0.1120 | 0.0140 | 0.0210 | Nil | 0.0607 | 0.0093 | 0.4858 | 0.1661 | 1.6225 |
Not. 1 | ” | 0.0280 | 0.0182 | 0.0560 | 0.0140 | 0.3073 | 1.0840 | 1.4178 | 1.1350 | 1.9972 |
2 | ” | 0.0140 | 0.0420 | 0.0140 | 0.0140 | 0.1791 | 0.2824 | 1.4140 | 0.1627 | 1.5766 |
3 | ” | 0.1820 | 0.0700 | 0.0140 | Nil | 0.1199 | 0.1513 | 0.8537 | 0.2941 | 2.1005 |
4 | ” | 0.0210 | 0.0280 | 0.0840 | 0.0140 | 0.0623 | 0.4766 | 1.2141 | 0.1023 | 2.2298 |
6 | 0.280 | 0.1400 | 0.0210 | 0.1120 | Nil | 0.4670 | 1.1637 | 1.9533 | 0.7517 | 2.2690 |
7 | Nil | 0.1400 | 0.0280 | 0.1400 | 0.0140 | 0.0593 | 0.6595 | 1.3960 | 0.4718 | 2.0730 |
8 | ” | 0.1400 | 0.0280 | 0.1400 | Nil | 0.0585 | 0.5250 | 1.2161 | 0.2343 | 1.7410 |
9 | ” | 0.2100 | 0.0560 | 0.1400 | 0.0182 | 0.2452 | 0.1681 | 0.9638 | 0.1661 | 1.6943 |
10 | ” | 0.2100 | 0.0420 | 0.2800 | Nil | 0.1215 | 0.5209 | 1.7887 | 0.3290 | 1.7000 |
13 | ” | 0.1400 | 0.0280 | 0.1400 | 0.0210 | 0.0603 | 0.5974 | 1.4260 | 0.5656 | 2.3280 |
14 | ” | 0.2100 | 0.0420 | 0.2100 | 0.0280 | 0.1245 | 0.1531 | 1.6210 | 0.4025 | 1.8100 |
15 | ” | 0.2100 | 0.0350 | 0.1400 | 0.0210 | 0.1837 | 0.1610 | 1.2037 | 0.3513 | 2.4100 |
16 | ” | 0.2100 | 0.0350 | 0.2100 | 0.0210 | 0.2240 | 0.0140 | 0.6250 | 0.1666 | 1.9890 |
17 | ” | 0.2100 | 0.0420 | 0.1400 | 0.0560 | 0.0549 | 0.1575 | 0.9620 | 0.0458 | 1.5620 |
18 | ” | 0.0560 | 0.1400 | 0.0280 | 0.0560 | Trace | 0.2165 | 0.7337 | 0.1570 | 1.6520 |
20 | ” | 0.2800 | 0.0420 | 0.2800 | 0.0280 | 0.0596 | 0.1738 | 1.3190 | 0.1469 | 2.8720 |
21 | ” | 0.2100 | 0.0420 | 0.2100 | 0.0210 | 0.1212 | 0.5291 | 1.2992 | 0.0338 | 2.6660 |
22 | ” | 0.0420 | 0.0560 | 0.0840 | 0.0420 | 0.0579 | 0.1036 | 1.0973 | 0.0616 | 2.3630 |
23 | ” | 0.0700 | 0.0420 | 0.0280 | 0.1400 | 0.1813 | 0.5311 | 1.1513 | 0.2456 | 1.9016 |
24 | ” | 0.0560 | 0.0420 | 0.0420 | 0.1400 | 0.1829 | 0.2520 | 0.8115 | 0.2545 | 1.6421 |
25 | 0.0140 | 0.0560 | 0.1680 | 0.0280 | 0.0600 | 0.0448 | 0.1792 | 0.2734 | 0.1754 | 1.1978 |
27 | Nil | 0.0210 | 0.0420 | 0.0140 | 0.0420 | 0.0605 | 0.0700 | 0.8155 | 0.0485 | 0.9348 |
28 | 0.1190 | 0.0490 | 0.0252 | 0.0560 | 0.1168 | 0.0066 | 1.3603 | 0.1023 | 0.0721 | |
29 | 0.0140 | 0.0280 | 0.0378 | 0.0182 | 0.0378 | 0.0472 | 0.1132 | 1.3684 | 0.1043 | 0.2153 |
30 | 0.0140 | 0.1820 | 0.0280 | 0.0322 | 0.0322 | 0.0466 | Lost | 1.3570 | 0.1184 | 1.5303 |
Dec. 1 | Nil | 0.0700 | 0.0840 | 0.0140 | 0.0350 | 0.1203 | 0.7335 | 0.6685 | 0.1090 | 1.9817 |
2 | ” | 0.0280 | 0.2100 | 0.0210 | 0.0700 | 0.1202 | 0.2118 | 0.6193 | 0.1601 | 1.6980 |
4 | 0.0280 | 0.2100 | 0.0280 | 0.0280 | 0.0280 | 0.2138 | 0.2211 | 1.4407 | 0.2188 | 2.0555 |
5 | Nil | 0.2100 | 00840 | 0.0210 | 0.0420 | Nil | 0.2878 | 1.1028 | 0.1604 | 2.4463 |
7 | ” | 0.0210 | 0.0280 | 0.0140 | 0.0210 | 0.1198 | 0.1588 | 0.4693 | 0.2930 | 0.8491 |
8 | ” | 0.0280 | 0.0210 | 0.0210 | 0.0140 | 0.2420 | 0.5795 | 1.2983 | 0.2210 | 1.6186 |
9 | ” | 0.0420 | 0.1400 | 0.3500 | 0.0210 | Trace | 0.1980 | 0.7150 | 0.0116 | 1.5865 |
11 | ” | 0.0140 | 0.0210 | 0.0420 | 0.0420 | 0.2379 | 0.2965 | 1.2190 | 0.3304 | 1.5128 |
12 | ” | 0.0280 | 0.1400 | 0.0420 | 0.0210 | 0.3688 | 0.7131 | 0.7201 | 0.5714 | 1.8435 |
13 | ” | 0.0280 | 0.0560 | 0.0280 | 0.0140 | 0.1758 | 0.1478 | 0.5560 | 0.1930 | 1.3376 |
14 | ” | 0.1400 | 0.0280 | 0.0280 | 0.0210 | 0.2450 | 0.2192 | 0.2312 | 0.0912 | 1.2240 |
15 | ” | 0.0210 | 0.0560 | 0.0210 | 0.0210 | 0.0622 | 0.1255 | 0.3023 | 0.2913 | 0.8119 |
16 | ” | 0.0210 | 0.2100 | 0.0210 | 0.1400 | 0.2833 | 0.3916 | 0.3881 | 0.2258 | 0.5645 |
18 | ” | 0.1400 | 0.0280 | 0.1400 | 0.0420 | 0.1196 | 0.2203 | 0.5663 | 0.0390 | 1.3278 |
19 | ” | 0.1050 | 0.1050 | 0.0420 | 0.0420 | 0.0595 | 0.4968 | 0.6138 | 0.1998 | 1.2833 |
20 | ” | 0.0420 | 0.2100 | 0.0280 | 0.0420 | 0.0606 | 0.1401 | 0.1228 | 0.2123 | 1.1573 |
21 | 0.0420 | 0.0280 | 0.1400 | 0.0280 | 0.0420 | 0.0173 | 0.1523 | 0.1627 | 0.3317 | 0.2553 |
22 | Nil | 0.0140 | 0.0280 | 0.0280 | Nil | 0.1001 | 0.1868 | 0.3335 | 0.2113 | 1.0656 |
27 | 0.0560 | 0.0840 | 0.0210 | 0.0560 | 0.0210 | 0.0612 | 0.0360 | 0.6992 | 0.0475 | 1.2004 |
28 | Nil | 0.0560 | 0.0210 | 0.0140 | 0.0140 | 0.0571 | 0.1224 | 0.4473 | 0.2210 | 1.2403 |
29 | ” | 0.0210 | 0.0420 | 0.0140 | 0.0280 | 0.1129 | 0.3213 | 0.5370 | 0.2719 | 1.2833 |
30 | ” | 0.0140 | 0.1050 | 0.0140 | 0.0420 | 0.0611 | 0.1266 | 0.1303 | 0.1019 | 1.2325 |
Averages | 0.004 | 0.0932 | 0.0767 | 0.0645 | 0.0409 | 0.1602 | 0.4474 | 0.9279 | 0.3562 | 1.5861 |