London's Pulse: Medical Officer of Health reports 1848-1972

View report page

London County Council 1900

[Report of the Medical Officer of Health for London County Council]

This page requires JavaScript


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.Average percentage purification effected on the crude sewage, as measured by the relative quantities of
Occupied in filling the bedsDuring 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.Length.Bate of flow of sewage through the tanks.
Name of chemical.Grains per gallon of sewage.
Average percentage purificationNumber of hours occupied in absorptionTemperature at which absorption took place ???.
Gallons.Feet.Gallons per day.Gallons.
11Burslem......Sewage which has been screened and passed through a septic tank...............l2l433242,000
12BurySince Mar., 1900...Sewage which has passed through a screening tank and been chemically treated and sedimented50,000 (each) 6 circular precipitation tanks2,000,000Ferro-zone or alumino-ferric6 to 74...333,333
13Cambridge......Storm flow more especially......• ••......Streaming method of supply to beds
14Carlisle2 yearsSewage which has been screened •...............2232223,9263848040
Nigh t sewage is treated contin uously in thes e beds(by coarse bed)
(by coarse bed and sand)
(by experimental bed, 1/8 in. mesh)
(by experimental bed, 1/32 in. mesh)
15Croydon2 years...Sewage which has been screened41,0001,500450,000......11/3211/321169,50063.84...60.7
16DarwenAbout 3 years1 to 5Sewage which has passed through a precipitation tank to remove as much solid matter as possibleCapacity about one day's dry weather flow.Alumino-ferric78hours421333,333
17Epsom.......In one case sewage from a septic tank, and in the other case sewage from land..................2......3