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 of the Bacteria Beds.

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 for treating the sewage previous to bacterial treatment.Number of hoursNumber 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 Gallons.Average percentage purification effected on the crude sewage, 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 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.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).
Average percentage purification.Number of hours occupied in absorption.Temperature at which absorption took place °F.
22Huddersfield10 Aug.,'98 to 23 Jan., '00...Sewage which had passed through a fine plate with inch perforations Effluent from coarse bedDetritus was settled in a trough and removed from time to time......l21...2...83,733664 (1st contact)8066
22...794 (2nd contact)8080
July,'98 to present timeSewage which had been chemically treated and sedimented1,250,000 6,000,000 (Total of 24 tank s)Lime Sulphate of iron3.5l2l...3...240,000784 (1st contact)8079
2.932...884 (2nd contact)8087
Aug.,'00 to presentSewage which had passed successively through a screen of 1 inch mesh, a small detritus tank and a septic tank Effluent from coarse bedSmall detritus tank used......l2½l...2 and 3170,000714 (1st contact)8071
time............2 and 32...824 (2nd contact)8081
23Hyde3 years ......Crude sewage which had passed through the septic tank75,0009075,000None...Continuous.........2,178,00085.74...90
24Keighley18 months...Sewage which had passed through detritus and sedimentation tanks687103,840None...Varied......2126,000...
25KetteringAbout 4 yearsSewage which has passed through precipitation tanksPrecipitation tanks are used, two of which are Dortmund tanks, each 25 feet in diameter and 40 feet deep to bottom of come. Capacity of each 80.000None...3 (varies)1 )2 to 3l (varies)2 or 3131,25050 4 80 35 ( Purification of tank effluent)
35,97060
35,70060
35,70060
34,86060
34,27060
49,59084
49,59084
49,12084
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 for treating the sewage previous to bacterial treatment.Number of hoursNumber 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 Gallons.Average percentage purification effected on the crude sewage, 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 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.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).
Average percentage purification.Number of hours occupied in absorption.Temperature at which absorption took place °F.
22Huddersfield10 Aug.,'98 to 23 Jan., '00...Sewage which had passed through a fine plate with inch perforations Effluent from coarse bedDetritus was settled in a trough and removed from time to time......l21...2...83,733664 (1st contact)8066
22...794 (2nd contact)8080
July,'98 to present timeSewage which had been chemically treated and sedimented1,250,000 6,000,000 (Total of 24 tank s)Lime Sulphate of iron3.5l2l...3...240,000784 (1st contact)8079
2.932...884 (2nd contact)8087
Aug.,'00 to presentSewage which had passed successively through a screen of 1 inch mesh, a small detritus tank and a septic tank Effluent from coarse bedSmall detritus tank used......l2½l...2 and 3170,000714 (1st contact)8071
time............2 and 32...824 (2nd contact)8081
23Hyde3 years ......Crude sewage which had passed through the septic tank75,0009075,000None...Continuous.........2,178,00085.74...90
24Keighley18 months...Sewage which had passed through detritus and sedimentation tanks687103,840None...Varied......2126,000...
25KetteringAbout 4 yearsSewage which has passed through precipitation tanksPrecipitation tanks are used, two of which are Dortmund tanks, each 25 feet in diameter and 40 feet deep to bottom of come. Capacity of each 80.000None...3 (varies)1 )2 to 3l (varies)2 or 3131,25050 4 80 35 ( Purification of tank effluent)
35,97060
35,70060
35,70060
34,86060
34,27060
49,59084
49,59084
49,12084