Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for London County Council]
III—EXPERIMENTAL BACTERIAL TREATMENT OF CRUDE SEWAGE AT
THE SOUTHERN OUTFALL WORKS (CROSSNESS).
1.—TABULATED LIST OF THE EXPERIMENTS AND OF THE BACTERIA-BEDS.
The various experiments at the Southern Outfall Works in connection with the bacterial
or natural treatment of sewage are included in the following list.
The treatment of crude sewage in bacteria-beds, with or without previous settlement—
(а) Without previous settlement—
In a single coke-bed, from April 22nd, 1898, to February 22nd, 1899 (Series I.).
In primary and secondary beds in series from September 1st, 1898, to February
22nd, 1899 (Series I.).
In a single coke-bed 13 feet deep from February 27th, 1899, to October 10th,
1899 (Series II.).
(б) With previous settlement—
In a single coke-bed, 13 feet deep, from October 10th, 1899, to July 28th,
1900 (Series II.).
In a single coke-bed, with continuous flow, from November 20th, 1899, to May
26th, 1900 (Series II.).
In a single coke-bed, preceded by septic action, from November 1st, 1900,
to October 5th, 1901 (Series III.).
The history of the three tanks which have been used throughout the experiments in the treatment of London sewage in coke-beds and in settling tanks at the Southern Outfall Works, is set forth in the following table—
|Tank A. 22 ft. 6 in. by 10 ft. 8 in., 13 ft. deep.||Tank B. 22 ft. 6 in. by 10 ft. 8 in., 13 ft. deep.||Tank C. 22 ft. 6 in. by 11 ft. 9 in. (average), 6 ft. deep.|
|Apr. 22||4 ft. single bed.|
|June 21||6 ft. secondary bed. (Used as a single bed at first in order to "mature" the coke.)|
|July 12||6 ft. primary bed.|
|(In course of construction, but dealing with sewage meanwhile.)|
|Sept. 1||In proper working order as a secondary bed.||Bed completed and in working order as a primary bed.|
|1899 Feb. 22||End of experiments of Series I.|
|,, 27||13 ft. single bed.|
|(Depth being increased from meanwhile.)||6 ft. to 13 ft., but bed working|
|Apr. 11||13 ft. single bed. (In proper working order.)|
|Oct. 10||End of experiment and commencement of experiment|
|Nov. 20||with sedimented sewage.||4 ft. single bed. (Continuous method.)|
|Dec. 24 1900 Jan. 13||During this period the experiments on the sedimentation of raw sewage in the large settling channels were being carried out. None of these coke beds were then in use.|
|„ 15||13 ft. single bed. (Dealing with sedimented sewage and number of fillings per day increased.)|
|July 28 Nov. 1||6 ft. single bed No. 2.||End of experiments of Series II. 6 ft. single bed, No. L||Used as a settling tank and afterwards as a septic tank also.|
|1901 Oct. 5||End of experiments of Series III.|