The experimental bacterial treatment of London sewage : being an account of the experiments carried out by the London County Council between the years 1892 and 1903 / by Frank Clowes and A.C. Houston.

  • London County Council
Date:
1904]
Catalogue details

Licence: In copyright

Credit: The experimental bacterial treatment of London sewage : being an account of the experiments carried out by the London County Council between the years 1892 and 1903 / by Frank Clowes and A.C. Houston. Source: Wellcome Collection.

    118/356 (page 82)
    In conclusion, it is worthy of note that the ratios of spores and of liquefiers to the total number of bacteria in the crude sewage and effluents respectively are approximately as follows— Crude sewage (26 samples)—Ratio of spores (aerobes) to total number of bacteria ... = 1 : 21.640 4-foot single coke-bed effluent (15 samples)— Ratio of spores (aerobes) to total number of bacteria ... ... ... ... ... = 1 : 19,709 6-foot primary coke-bed effluent (8 samples)— Ratio of spores (aerobes) to total number ofbacteria ... ... ... ... ... = 1 : 26,513 6-foot secondary coke-bed effluent (3 samples) —Ratio of spores (aerobes) to total number ofbacteria ... ... ... ... ... = 1 : 13,436 Crude sewage (26 samples)—Ratio of liquefiers to total number of bacteria ... ... = 1 : 6*8 4-foot single coke-bed effluent (15 samples)— Ratio of liquefiers to total number of bacteria = 1 : 6‘0 6-foot primary coke-bed effluent (8 samples)— Ratio of liquefiers to total number of bacteria ... ... ... ... ... = 1 : 8*1 6-foot secondary coke-bed effluent (3 samples'' —Ratio of liquefiers to total number of bacteria ... ... ... ... ... = 1 : 5*1 These results would seem to indicate that the result of the bacterial treatment of the raw sewage in the coke-beds was to effect an increase in the number of spores and of liquefiers relative to the total number of micro-organisms in the case of the 4-foot single and of the 6-foot secondary beds, and to bring about a decrease in the number of spores and liquefiers relative to the total number in the case of the 6-foot primary coke-bed. But the records are not sufficiently numerous to allow of a definite statement being made. Table IY. Number of B. coli or closely allied forms in 1 c.c. Effluent from Effluent from Effluent from Crossness 4-foot single 6-foot primary 6-foot secondare crude sewage. coke-bed. coke-bed. coke-bed. 1S98. May 11.. 18 ... )) 25... June 9... 15 ... »» 22 .. July 20.. 27 .. August 4 .. M 9 .. 19 .. None in O’OOOOl c.c. 300.000 1,500,000 200.000 300,000 300,000 300.000 500.000 200.000 1,000,000 100,000 I 200,000 200,000 700.000 100.000 600,000 300,000 300,000 300,000 None in O’OOOOl c.c. 600,000 200,000 24 , September 14 ... )» 21 ... 28... October 5... 300,000 600,000 1,600,000 1,000,000 1,200,000 400.000 900.000 400.000 700.000 1,300.000