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 1900
[Report of the Medical Officer of Health for London County Council]
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Table 3- Particulars as to the working of the Bacteria Beds.
| 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 Chemicals used for detritus tanks. treating the sewage previous to bacterial treatment. | Number of hours | Number of fillings per 24 hours. | Number of contacts in successire beds. | Quantity of sewage treated in 24 hours, per acre of bed, one foot deep. Calculated for the purpose of comparison. Gallons. | Average percentage purification effected on the crude sewage, as measured by the relative quantities of | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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). | 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. | |||||||||||||||
| 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 ° F. | ||||||||||||||||||
| 47 | York | 21 April, 1899 to 31 Aug., 1901 | 1,2,3,4 | Closed septic tank effluent | ... | 1½ to 2 2 variable | 4 to 4½ | 2 & 3 | l | 69,193 and 196,085 | 65.47 | 4 | 80 | 61.97 | ||||||
| 13 June, 1899 to 13 Oct., 1900 | la, 2a | Crude sewage which had been screened | ... | • • • | var ied | 3 | 2 | 55,569 | 80.0 | 4 | 80 | 72.0 | ||||||||
| 8 June, 1899 to 15 Sept., 1900 | Ladder filter (10 chambers in series later, 2 sets of 5 chambers in series) | Raw sewage | ... | ... | ... | ... | 175,368 | 44.3 | 4 | 80 | 36.6 | |||||||||
| 5 July, 1900 to 12 Mar., 1900 | York filter | Open septic tank effluent | ... | ... | ... | continuo us process | ... | 327,631 | 84.5 | 4 | 80 | 90.0 | ||||||||
| 23 Nov., 1900 to 1 J uly, 1901 | la, 2a | Open septic tank effluent | ... | ... | ... | ... | 1½ | 2 | 3 | 3 | 1 | 65,200 . | 78.6 | 4 | 80 | 87.6 | ||||
| 14 June, 1899 | 1,2, 3,4 | Closed septic tank effluent (finally treated on land filters) | ... | ... | ... | |||||||||||||||
| Gravel | Open septic tank effluent (not satisfactory) | ... | ||||||||||||||||||
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