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: Table 2. Particulars as to the working ok the Bacteria Beds.

Table 2. Particulars as to the working ok the Bacteria Beds.

No.Name of town or district.Time during which the bed 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 hoursQuantity 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 srhich the beds remained empty aeration period).Number of fillings per 24 hours.Number of contacts in successive beds.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 oed 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
26Leeds2 Oct., '97 to 2 Feb., '98No. 1 coarse bed No. 2 fine bedSewage screened by vertical bars one inch apartNot settled...None...121432No. 12 precipitation tank used
...............121432No. 11 precipitation tank used82.3480736
18 Feb., '98 to 3 Mar., '98No. 1 coarse bed No. 2 fine bedSewage which had been chemically treated and sedimented...Lime
4 Mar., '98 to 8 Sept., '98No. 1 coarse bed No. 2 fine bedSewage which had passed through a fine screen with holes 1/8 inch diameter.........None1 2 1 4* 3f 2 *Increased to average of 8 hours during the experimental period.
............1 2 1 4* 3f 2 -(•Reduced to 2 fillings per day during the experimental period.8448086
9 Sept., '98 to 18 Nov. '98No. 1 coarse bed No. 2 fine bedSewage which had been settledNo. 1 settling tank...None...1218 average22...86.6480866
2 Dec., '98 to 6 Jan., '991, 2,3,4Sewage which had been settled.........Lime28............32...0
7 Jan., '99 to 1 June,' 001, 2, 3, 4, 5, 6Sewage from which the grit had been settled.........None........................9248087
8 Mar., '997Sewage which had been chemically treated and sedimented.........Lime......2......3......7748062
20 Mar., '998Sewage which had passed through a septic tank..................2...31...7448063
22 Sept., '99 to 16 June, '001,2, 3, 4, 5, 6Sewage which had passed through the closed septic tanks.........None...............1 1/3......9048086
9 Mar., '99 to 12 May, '00Whit-taker No. 1 Whit- taker No. 2Sewage which had passed through No. 1 open septic tank...............Continuous met hod.........83 4 80 73 (Purification of septic effluent)
2 Sept., '99 to 30 June, '00Sewage which had passed through No. 1 open septic tank...............Continuous method.........85 4 80 82 (Purification of septic effluent)
1, 2, & 3 continuousSewage which had been screened (mesh, 37 per inch)...............Continuous method.........7848071
29 Mar., '00 to 7 July, '00DucatSewage which had been screened (3/16 inch screen) and which had passed through a small grit chamber...............Working alternate hours for 10 hours, rest 14 hours.........91 to 9748088 to 96