[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. Gallons.	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. Gallons.	Length. Feet.	Rate of flow of sewage through the tanks. Gallons per daw
								Name of chemical.	Grains per gallon of 6ewage.
								Name of chemical.	Grains per gallon of 6ewage.								Average percentage purification.	Number of hours occupied in absorption.	Temperature at which absorption took place o
37	Reigate	3 years	1 and 2	The sewage contains large quantities of brewery and tannery refuse	... (Two	8 3. x 4	18,000 X 8 feet)	None used	...	...	...	...	...	*	• 2	...	81	4	55	87
38	Rochdale	2½years	1 and 2	Sewage after passing through open septic tank	200,000	160	160,000	None	...	conti	nuous	process	...		...	215,111	84.0	4	57 to 63	84.2
39	Salford	...	...	Sewage from which road detritus etc., has been removed in "silt pits," and which has passed through precipitation tanks	5,250,000 (total of 12 tanks)	110 (each)	12,000,000 (average)	Lime	13	contin	uous m	ethod	by spr	ay jets	2	( 2,500,000 to 7,000,000 ) \ 5 to 8 feet deep j
40	Sheffield	3 years	...	Sewage which has rapidly passed over two catch pits (the heavier detritus separates fairly readily, but finely divided mineral matter remains mixed with pntrescible solids)	...	...	...	...	...	1	i	2	4	3	2	200,000 (in first contact beds) 195,000 (in second contact beds)	87 to 90	4	Laboratory temperature	92.0 (about)
41	Southport	...	...	Screened sewage	...	...	...	...	...	1	2	1	2	4	2	295,000	79.8 Average of	4 3 samples	80 June & J	uly, 1900
42	Swinton and Pentlebury	...	...	Screened and chemically treated and precipitated sewage	...	...	...	Lime Sulphate of iron	...	...	n	...	...	3	2	...
43	Wolverhampton	...	...	Tank effluent after lime treatment. It was possible to only partially separate out road detritus	...	...	...	Lime	...	1½	2	n	7	1& 2	...	200,000 (Bed No. 1 two fillings) 123,000 (Bed No. 2 two fillings)	835 on tank effluent
44	Wednesbury		Primary Secondary Secondary	Septic tank effluent	...	...	...				2			3	2
					...	...	...	...	...	conti	nuous	proces	s ...	...	...		860	4	80
					...	...	...	...	...	...	...	...	...	...	...		87-7	4	80
45	West Bromwich	12 Sept.,'99 to 1 Nov., '00	Single contract	Effluent from septic tank	50,000	40	...	•••	...	1½	2	1½	3	3	1	...	57	4	...	54.7
		8 Oct., '99 to 1 Nov,, '00	Primary Secondary	Crude sewage	...	...	...	None	...	1½	2	1½	3	3	2	...	85-9	4	...	78.6
46	Worcester	...	...	Domestic sewage from isolation hospital	...	...	...	None	...	...	...	...	...	...	...	...	97-7	4	...	95.2