Sewer rivers : minute of Committee on the practicability of purifying the water flowing from the River Medlock into the Duke of Bridgewater's Canal / Manchester and Salford Sanitary Association.

  • Manchester and Salford Sanitary Association.
Date:
1856
Catalogue details

Licence: Public Domain Mark

Credit: Sewer rivers : minute of Committee on the practicability of purifying the water flowing from the River Medlock into the Duke of Bridgewater's Canal / Manchester and Salford Sanitary Association. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    In regard to the appearance of the water Dr. Smith and Mr. Me. Dougall observe— “ The water of the Medlock, as is well known, is of a dark bluish tinge, somewhat resembling ink at a distance, and ceases to be transparent when more thau an inch deep. The clarified water is transparent through several feet, and when standing in a glass, cannot be perceived to be impure.” (A.) By Mr. Grace Calvert. As to the effect of the lime process; [see Tables 1, 2, 3, 4, (C.) for the several experiments.] i. Medlock water (matter in suspension). Water was taken from the Medlock, before admixture with lime, which, by filtration, produced (on the mean average) of Organic and Inorganic Matter combined, in suspension, 6-65 grains in every gallon. . By analysis, the proportions in this quantity were found (Table 2 C.)— Per Cent. In Grains. Organic Matter 53-69 3-57 Inorganic “ 46-31 3-08 100-00 6 65 ii. Purified water (matter in suspension). By the like process of filtration, on the same days, after the appli- cation of lime, the quantity of Organic and Inorganic Matter combined, in suspension, was found, on the average, in the water passing over the outer dam into the canal, 4-67 grains in eveiy gallon. (Table 3 C.) which by analysis gave— ' Per Cent. In Grains. Organic Matter 24-01 1'14 Inorganic “ 75 39 3-53 ] 00-00 4-67 From which it appears that the application of lime had caused a precipitation, independently of its own weight, of 2 grains per gallon, or about 30 per cent, of extraneous matter, and had reduced the proportion of organic (corruptible) matter flowing into the Canal in suspension, from 53-69 per cent, to 24-01 percent., or from 3 57 grains to 114 grains.