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
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 dav.Name of chemical.Grains per gallon of sewage.
Average percentage purification.Number of hours occupied in absorption.Temperature at which absorption took place
31MiddletonCommenced 29 Nov., '99 26 Jan., '001Tank effluent from sewage which has passed through a grit chamber, and then beei treated with chemicals and sedimented120,00024 in diameter1,000,000Ferozone6...3,...3.........90.0
2
32Nelson11 months1Tank effluent1,050,00010 each 100 x 30600,000 (dry weather flow)Alumino ferric9½ (about)6............71.4
3 years2
2½ years3
10 months4
16 months5
2½ weeks6
33Oldham1897to end of 1898Effluent from chemically treated and sedimented sewage2,116,800 (total of 12 tanks)128...Sulphate of iron Lime1½to2/32 to 322 (at least)2 (Sundays included)...161,000 (about)79.14...82.1
...4
1899 to date...Effluent from sewage after subsidence(Each of 2detritus tanks)4522,500.....................84.14...84.3
12 and 13Settling tank liquid drawn off by floating arms previous to cleaning tank..................1 to 24
34Ormskirk......Sewage after having gone through process of land filtration83,000 (8 tanks total)...........................110.083 110,19588.2......89.7
35Oswestry...Primary SecondarySettling tank liquid56,000 (total)7029,531...½to 1¼1 to 2½¾2 to 52 to 5...100,000
Effluent from primary beds....1 to 1½3 to 413 to 4½22...88.20.314089.7
36Oldbnry...Primary SecondaryChemically treated and sedimented sewage..................2......2
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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 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
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 dav.Name of chemical.Grains per gallon of sewage.
Average percentage purification.Number of hours occupied in absorption.Temperature at which absorption took place
31MiddletonCommenced 29 Nov., '99 26 Jan., '001Tank effluent from sewage which has passed through a grit chamber, and then beei treated with chemicals and sedimented120,00024 in diameter1,000,000Ferozone6...3,...3.........90.0
2
32Nelson11 months1Tank effluent1,050,00010 each 100 x 30600,000 (dry weather flow)Alumino ferric9½ (about)6............71.4
3 years2
2½ years3
10 months4
16 months5
2½ weeks6
33Oldham1897to end of 1898Effluent from chemically treated and sedimented sewage2,116,800 (total of 12 tanks)128...Sulphate of iron Lime1½to2/32 to 322 (at least)2 (Sundays included)...161,000 (about)79.14...82.1
...4
1899 to date...Effluent from sewage after subsidence(Each of 2detritus tanks)4522,500.....................84.14...84.3
12 and 13Settling tank liquid drawn off by floating arms previous to cleaning tank..................1 to 24
34Ormskirk......Sewage after having gone through process of land filtration83,000 (8 tanks total)...........................110.083 110,19588.2......89.7
35Oswestry...Primary SecondarySettling tank liquid56,000 (total)7029,531...½to 1¼1 to 2½¾2 to 52 to 5...100,000
Effluent from primary beds....1 to 1½3 to 413 to 4½22...88.20.314089.7
36Oldbnry...Primary SecondaryChemically treated and sedimented sewage..................2......2
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