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.

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    Explanation of the tables ing the rapid settlement of raw sewage in the channels used at Crossness in connection with the chemical treatment and precipitation. In the last table but one, on pp. 4-8-9, it has been necessary to indicate in columns 2 and 3 the maximum and minimum results for the sewage which refer to bed No. 1, and another maximum and minimum in those columns which refer to bed No. 2. In the table XVIII., pp. 50 to 57, the averages of the various estimations in each experiment are given, together with the percentage purification effected by each individual tank or bed on the liquid with which it dealt, and the percentage of purification effected by the whole process on the raw sewage. The percentage purification is calculated from the amount of oxygen absorbed by the total putrescible matter and by the dissolved putrescible matter in the various liquids. Similar figures relating to the chemical treatment of the sewage at each Outfall Works are added for the purpose of comparison. In the following tables all quantities, except where otherwise stated, are expressed in parts per 100,000. To convert parts per 100,000 into grains per gallon, multiply by 0-7; to convert grains per gallon into parts per 100,000, multiply by