Pacific municipalities . • i^o ^ ^7o-H ^— ?»o ? Zi- ^^ ^ jt ? j - - - ^^m ^ ?y ^ ^^^ 1 ^^d Travis Ta?7k . i arrangement which permits a flow of asmall amount of the li(iuid in the reduc-tion chamber out into a supplementaltreatment tank, a slight downward cur-rent is maintained from the compart-ments containing fresh sewage to thereduction chamber. It will be noted that the shape of thetank is such that the decomposition,gases which rise in the reduction cham-ber can not pass up through the freshsewage. This is an essential feature. President of the .American Eugrineeriiig Corporation. 228 PAC
Pacific municipalities . • i^o ^ ^7o-H ^— ?»o ? Zi- ^^ ^ jt ? j - - - ^^m ^ ?y ^ ^^^ 1 ^^d Travis Ta?7k . i arrangement which permits a flow of asmall amount of the li(iuid in the reduc-tion chamber out into a supplementaltreatment tank, a slight downward cur-rent is maintained from the compart-ments containing fresh sewage to thereduction chamber. It will be noted that the shape of thetank is such that the decomposition,gases which rise in the reduction cham-ber can not pass up through the freshsewage. This is an essential feature. President of the .American Eugrineeriiig Corporation. 228 PACIFIC MUNICIPALITIES A scum forms on top of the liquid inthe reduction chamber. The sludge isdrawn off from the bottom in pipes notshown in the section. Aery similiar in its general arrange-ments to the Travis tank is the latertank perfected by Dr. Karl Imhoff andnow in successful use at many points inthe Enischer Valley, Germany, and al-ready reported as about to be installedat a number of places in the United. KIG. 2. SECTIONAL VIEW OF IMHOFF TANK States, as at x\tlanta, Georgia, and forMontclair and neighboring New Jerseytowns. This tank is illustrated in diagrama-tic form in Fig. 2. The fresh .sewageflows in compartment Ui). The solidssink to the bottom of compartment ( / ).The gases which rise in the reductionchamber accumulate at and are let offat convenient points. The scum, which corresponds to thoroughly decomposedsludge,can be drawn off through speciallyprovided outlets id), which are said,however, not to be essential. The sludgeis drawn off through a conduit (dc) withoutlet somewhat lower than the surfaceof the liquid in the tank. It is claimed for the Imhoff tankthat it will remove from the sewage ashigh as 95 per cent of the matter cap-able of settling out; that very little sul-phuretted hydrogen is generated in thetreatment; that the fresh sewage effluentis in good condition for further treat-ment by any of the ordinary methods offiltration, application to lan
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