. ONTARIO SESSIONAL PAPERS, 1914, SIDE ELEVATION. T11 i r.—rr Septic Tank. I PLAN. sewage has been due to sedimentation, as well as to biological digestion. Bothchemical and physical analyses of the effluents from such tanks, unfortunately, havebeen influenced by the effect of sedimentation and did not give a true measure ofthe efficiency of biological digestion. It therefore seemed advisable to do somework with septic tanks, precluding any iinprovement by sedimentation, by the useof a settled sewage. At first the effluent from a settling tank was used; later thework was done wit
. ONTARIO SESSIONAL PAPERS, 1914, SIDE ELEVATION. T11 i r.—rr Septic Tank. I PLAN. sewage has been due to sedimentation, as well as to biological digestion. Bothchemical and physical analyses of the effluents from such tanks, unfortunately, havebeen influenced by the effect of sedimentation and did not give a true measure ofthe efficiency of biological digestion. It therefore seemed advisable to do somework with septic tanks, precluding any iinprovement by sedimentation, by the useof a settled sewage. At first the effluent from a settling tank was used; later thework was done with an Imhoff effluent. Consequently, any improvement in char-acter in the sewage was due to the septic digestion of the semi-colloidal and colloidalmatter in the sewage—not to an improvement by sedimentation of solids in sus- 106 THE KEPORT OF THE No. 31 pension. In connection with this work two hatteries of tanks were operated to findthe optimum length of storage for and the effect of aeration on septic sewage. The four tanks used were of concrete, 25 feet long by 1 foot 6 inches wid
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