Public works . o or three tanks at a time;all six tanks were used, but in rotation. This gave twoor three times the previous velocity to the sewage pass-ing through the tanks and resulted in distributing thesludge more uniformly throughout the sludge the adoption of these two changes in operation thefoaming difficulty appears to have been reduced to rela-tively unimportant dimensions. Whether this is due mostto the method of passing the sewage through the tanksmore rapidly or to the use of the screen. SuperintendentDownes was unable to say, but believes that each shouldbe credited
Public works . o or three tanks at a time;all six tanks were used, but in rotation. This gave twoor three times the previous velocity to the sewage pass-ing through the tanks and resulted in distributing thesludge more uniformly throughout the sludge the adoption of these two changes in operation thefoaming difficulty appears to have been reduced to rela-tively unimportant dimensions. Whether this is due mostto the method of passing the sewage through the tanksmore rapidly or to the use of the screen. SuperintendentDownes was unable to say, but believes that each shouldbe credited with part of the improvement. Although very little foaming has shown itself in thesedimentation tanks for a year now, the change in oper-ation has been accompanied by a considerable increaseof foaming in the secondary Imhoff tank, which receivesthe effluent from the sprinkling filters. The foaming inthis one small tank, however, is not so serious as it hadbeen in each of the six primary ones, and can easily be. SPRINKLING FILTER UNDER ; SHOWING COLLECTING DRAINS, DISTRIBUTING MAINS I.\ AND DIS-TRIBUTING PIPES RESTING ON BOTTOM READY TO BE SET; POSTS FOR SUPPORTING SPRINKLER SPEXJIALS. FILTER STONE IN TL,ACE AT THE LEFT. 320 MUNICIPAL JOURNAL AND PUBLIC WORKS Vol. XLVII, No. 22
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
