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 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 detritus tanks. | Chemicals used foe 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 purification effected on the crude sewage, as measured by the relative quantities of | |||||||||
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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. | Kate of flow of sewage through the tanks. Gallons per day. | Name of chemical. | Grains per gallon of sewage. | ||||||||||||||||
Gallons. | Average percentage purification. | Number of hours occupied in absorption. | Temperature at which absorption took place ° F. | |||||||||||||||||
18 | Evesham | Beds not yet completed | 1/6 of daily flow | None | used | |||||||||||||||
19 | Glasgow | ... | Open septic tank effluent derived from crude sewage which contains a large quantity of trades' effluent of a variable nature | ... | ... | ... | None | ... | ½ | 2 | l | 2 to 3 | 1 to 3 | 2 | 36,814 One filling daily | 95 | 4 | 80 | 90.6 | |
20 | Haslingden, Rawten-stall and Bacup | ... | Sewage which had been screened and which had passed through a septic tank | 1,825,000 (4 tank | 180 s each 60 | 1,825,000 feet wide) | ... | ... | 3 Partly meth | 1 on the od | l contin | 14 uous | 2 | ... | ... | 86 79.6 (Both are cal on the tank e | 4 4 figures culated septic ffluent) | 80 80 | 90 871 | |
21 | Hey wood | ... | Sewage from septic tank Sewage which had been chemically precipitated | 1 | 60 |