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CONTENTS.
DIVISION I.—CHEMICAL AND GENERAL.
Section I.—General Objects and Conclusions.
1. Introductory.
2. Objects of the Coke-bed Experiments.
3. General results obtained.
4. General Conclusions.
5. Advantages of Bacterial over Chemical Treatment.
Section II.—Construction and Working of the Coke-beds.
1. Construction and Details of the Coke-beds.
2. Method of Working the Beds, and their present condition.
3. History of each Coke-bed.
4. Experimental proof of the Aeration of the Coke-beds.
5. Variation in the Condition of the Raw Sewage, and its effect upon the Effluent.
6. Comparative purity of clear Sewage, Bacterial Effluent and Chemical Effluent.
Section III.—Tables and Curves, showing the Results of the Chemical Examination of
the Crude Sewage before and after Treatment in the Coke-beds.
Table I.—Results obtained by the Chemical Determination of the Relative Amounts of
Dissolved Oxidisable Matter in the Raw Sewage before and after the Bacterial
Treatment.
Diagram 1.—Curves showing the Variation in the Relative Amount of Dissolved Oxidisable
Matter in the Crude and in the Treated Sewage from July, 1898, to February, 1899,
and the Rainfall at corresponding times. Also Curves showing the Variation in the
Weekly Averages of Percentage Purification effected on the Raw Sewage by the
Bacterial Treatment, as measured by the removal of Dissolved Oxidisable Matter.
Diagram 2.—Curve showing the Daily Variation in the Percentage Purification effected on
the Raw Sewage by the Bacterial Treatment.
(The Diagrams will be found immediately following page 41 of the text.)