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

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.

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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 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
					Particulars of the settling and of the detritus tanks.					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.	Length.	Bate of flow of sewage through the tanks.
								Name of chemical.	Grains per gallon of sewage.
																			Average percentage purification	Number of hours occupied in absorption	Temperature at which absorption took place ???.
					Gallons.	Feet.	Gallons per day.										Gallons.		Average percentage purification	Number of hours occupied in absorption	Temperature at which absorption took place ???.
11	Burslem	...	...	Sewage which has been screened and passed through a septic tank	...	...	...	...	...	l	2	l	4	3	3	242,000
12	Bury	Since Mar., 1900	...	Sewage which has passed through a screening tank and been chemically treated and sedimented	50,000 (each) 6 circular precipitation tanks		2,000,000	Ferro-zone or alumino-ferric	6 to 7	1½	1½	1½	1½	4	...	333,333
13	Cambridge	...	...	Storm flow more especially	...	...	• ••	...	...		Streaming method of supply to beds
14	Carlisle	2 years		Sewage which has been screened •	...	...	...	...	...	1½	2	1½	2	3	2	223,926		38		4	80	40
											Nigh t sewage is treated contin uously in thes e beds							(by coarse bed)
											Nigh t sewage is treated contin uously in thes e beds							47		4	80	49
																		(by coarse bed and sand)
																		58		4	80	52
																		(by experimental bed, 1/8 in. mesh)
																		79		4	80	75
																		(by experimental bed, 1/32 in. mesh)
15	Croydon	2 years	...	Sewage which has been screened	41,000	1,500	450,000	...	...	11/3	2	11/3	2½	2	1	169,500		63.8		4	...	60.7
16	Darwen	About 3 years	1 to 5	Sewage which has passed through a precipitation tank to remove as much solid matter as possible	Capacity about one day's dry weather flow.			Alumino-ferric	7	8	hours		4	2	1	333,333
17	Epsom	...	....	In one case sewage from a septic tank, and in the other case sewage from land	...	...	...	...	...	...	2	...	...	3