Public works . nts of the two-story tank makes the ebbullition ofgas and sludge more pronounced, however, than inthe one-story tank. The theoretical cause of foaming, as advanced bychemists, bacteriologists and sanitary engineers, isthe predominance of the ordinary bacterial decompo-sition over enzyme action or liquefaction. Ordinarybacterial decomposition results in the production ofexcessive sulphurous gases which are not entirelyabsorbed by the surrounding liquid. How to secure Table No. 2—Data on Design of the Largest Imhoff Tanks in the United States Municipality Albany Atlanta Plant No.
Public works . nts of the two-story tank makes the ebbullition ofgas and sludge more pronounced, however, than inthe one-story tank. The theoretical cause of foaming, as advanced bychemists, bacteriologists and sanitary engineers, isthe predominance of the ordinary bacterial decompo-sition over enzyme action or liquefaction. Ordinarybacterial decomposition results in the production ofexcessive sulphurous gases which are not entirelyabsorbed by the surrounding liquid. How to secure Table No. 2—Data on Design of the Largest Imhoff Tanks in the United States Municipality Albany Atlanta Plant No. 1. Plant No. 2. Plant No. 3. Baltimore Columbus Rochester Plant No. 1. Plant No. .... Capacity, million gals, per dav 30 n Total Depth, in feet 27 25 Percentage Area of Detention Sludge Gas Vents to Period, Storage, cu. ft. Settling Area hours per capita 475 3 SlotSize,inches 2627 402321 189 34 1220 Sludge Red Area, sq. ft. per capita .44 .39 5 MEIW vJElRSELY. IMHOFF TAMK SECTIONS a proper balance between enzyme liquefaction and bacterial decom-position, with a predominance ofthe former, has never been dis-covered. Foaming occurs in alltypes of two-story tanks and itmay occur with all or any char-acter of sewage, although it hasbeen found less noticeable withstale sewage. HAt-lMOMTOM V>/E:STF1£1_D FIG. 1.—SECTIONS OF PRINCIPAL. IMHOFF TANKS IN NEW JERSEY DESIGNS OF IMHOFF TANKS Table No. 2 gives a list of thelarger Imhoff tanks constructedin this country, with the unit sizefor which the tanks were de-signed. The depth ranges from21 feet to 40 feet, the gas ventarea from less than S^/c to 34%,the detention period from one-half to three hours, the sludgestorage capacity from .75 cubicfoot per capita to , the sludgebed area from to square January 21, 1922 PUBLIC W O R K S 41 toot per cajiita. llie dimensions of these tanks wereobtained from \arioiis ])eriodicals. Table No. 3 indicates the unit sizes used in thed
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
