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 2. Particulars as to the working
No. | Name of town or district. | Time during which the beds were in use. | Name or number of the bed used. | Character of the liquid supplied to the beds. | Particulars of the settling and of the detritus tanks. | Chemicals used for treating the sewage previous to bacterial treatment. | Number of hours | Number of fillings per 24 hours. | Number of contacts in successive beds. | Quantity of sewage treated in 24 hours, per acre of bed, one foot deep. Calculated for the purpose of comparison. | Average percentage purificatiom effected on the crude 6ewage, as measured by the relative quantities of | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Oxygen absorbed by the crude sewage and by the final bacteria bed effluent. | Albuminoid ammonia present in the crude sewage and in the final bacteria bed effluent. | |||||||||||||||||||||
Occupied in filling the beds. | During which the beds remained full (contact period). | Occupied in emptying the beds. | During which the beds remained empty (aeration period). | |||||||||||||||||||
Capacity. Gallons. | Length. Feet. | Rate of flow of sewage through the tanks. Gallons per day. | Name of chemical. | Grains per gallon of sewage. | Average percentage purification. | Number of hours occupied in absorption. | Temperature at Which absorption took place | |||||||||||||||
Gallons. | ||||||||||||||||||||||
3 | 1 | 72.7 | 4 | 80 | 72.6 | |||||||||||||||||
27 | Leicester | 24 Oct. to 10 Nov., 1898 | 1 p | Sewage which had passed through an open detritus tank | 18,681 | 30 | ... | Q | \ | 68.9 | 4 | 80 | 74.8 | |||||||||
11 Nov. to 26 Nov., 1898 | l p | Sewage which had passed through a closed detritus tank | ... | (15 feet wide, 7 feet d eep) | o | |||||||||||||||||
1 s | i | 73.9 | 4 | 80 | 66.6 | |||||||||||||||||
1 Sept. to 10 Nov., 1898 | • •• | Sewage which had passed through an open detritus tank and an open settling tank | ... | ... | ... | ... | ... | ... | ... | ... | (1 filling daily for first 12 days only) | |||||||||||
a | 1 | 72.6 | 4 | 80 | 81.1 | |||||||||||||||||
11 Nov. to 6 Dec., 1898 | • •• | Sewage which had passed through a closed detritus tank and an open settling tank | ... | ••• | ... | |||||||||||||||||
1 | 9. | 2 | 3 | 3 | 1 | 71.2 | 4 | 80 | 71.0 | |||||||||||||
7 Dec., 1898 to 22 July, 1899 | • •• | Sewage which had passed through a closed detritus tank | ... | ... | ... | a | 1 | |||||||||||||||
76.2 | 4 | 80 | 65.0 | |||||||||||||||||||
24 July to 15 Sept., 1899 | • • • | Sewage which had passed through a closed detritus tank and a closed septic tank | ... | « | • •• | ... | ... | |||||||||||||||
4 | 1 | 73.5 | 4 | 80 | 73.6 | |||||||||||||||||
19 Sept. to 13 Oct., 1899 | • •• | Sewage which had passed through a closed detritus tank | ... | ... | ... | ... | ... | ... | ||||||||||||||
3 | 2 | 90.2 | 4 | 80 | 83.1 | |||||||||||||||||
28 Nov., 1898 to 19 July, 1899 | 1p | Sewage which had passed through a closed detritus tank | ... | ... | ... | ... | ... | |||||||||||||||
3 | 2 | 89.7 | 4 | 80 | 79.9 | |||||||||||||||||
20 July to 2 Sept., 1899 | • •• | Sewage which had passed through a closed detritus tank and closed septic tank | ... | ... | ... | •. • | ||||||||||||||||
3 | 3 | 89.6 | 4 | 80 | 83.7 | |||||||||||||||||
4 Sept. to 15 Sept., 1899 | 1 P, 1 and 2 S | Sewage which had passed through a closed detritus tank and closed septic tank | ••• | ... | ... | ... | ... | |||||||||||||||
4 | 3 | 91.3 | 4 | 80 | 86.7 | |||||||||||||||||
19 Sept. to 13 Oct., 1899 | ... | Sewage which had passed through a closed detritus tank | ... | • •• | ... | ... | ||||||||||||||||
Alumino ferric | 35 | 2 | 2 | 2 | 2 | 3 | 2 | 209,234 | ||||||||||||||
28 | Lincoln ... | ... | Sewage which had been chemically treated and sedimented (12 hours' settlement) | No detritus tank is used | ||||||||||||||||||
29 | Liverpool (West Derby Sewage Farm) | June, 1899, to date | All ... | Crude sewage | No settling tank. | None ... | 3 . 4 | 2 | i | Varies from 2 to 8 | 1 to 3 | 2 | 66,000 (average) |
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