[Report 1902] / Medical Officer of Health, Oldham County Borough.
- Oldham (England). County Borough Council. nb2004302054.
- Date:
- 1902
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: [Report 1902] / Medical Officer of Health, Oldham County Borough. Source: Wellcome Collection.
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![No. VIII. GROUP. This group comprises as yet, Filters 19, 20, 21; having an area of 4,ol6 square yards; a cubical capacity when completely empty of 4,516 cubic yards; representing a volume of 758,700 gallons. The working capacity of this group when last measured was, approximately, 300,000 gallons. 19 Filter was filled for the first time on May 28th, 1902. Depth of Filter, 3ft. Oin. 20 ,, ,, „ Dec. 1st, 1902. ,, ,, 3ft. Oin. 21 „ „ Oct. 20th, 1902. „ „ 3ft. Oin. 20 Filter was not working during the greater part of December on account of serious leakage. Grains of Oxygen Absorbed per Gallon in Four Hours Test. Month. Jan. Feb. Mar. April May June July Aug Sep. Oct. Nov. Dec. Avge. of V ear. Sewage . . . . • • • • • • • • • • • • 4-29 3-94 4-69 2-13 CO CD O i 4-13 3-83 Tank Effluent ... • . . • • • 2-67 2-67 307 1-66 2-53 2-68 2-55 Filtrate . • • • 1-69 1-18 1-90 •43 •86 •70 1-12 Percentage of Purification from Tank Effluent to Filtrate ... • • • • • • • • • 36i 56 38 74 66 ] 74 57| Percentage of Purification from Sew¬ age to Fil¬ trate ......... ... • • • • • • ... i •** 60S 70 594 80 77 CO GO 71f The average amount of albuminoid ammonia present was -219 grains per gallon. Twenty-two estimations of the amount of nitrate present have been made, and the average amount found was -39 grains per gallon, estimated as NH3. 113 samples were incubated, of which 107 remained good, 4 were doubtful, and 2 became putrid. The amount of rest and rate of working of this group are indicated in the](https://iiif.wellcomecollection.org/image/b29936834_0144.jp2/full/800%2C/0/default.jpg)
