Public works . per per at 20° C 52,000,000 15,700,000 at 37° C 5,000,000 3,000,000 Coli group 60,000 Proteus group 100,000 at least Denitrifiers 100,000 Fat-sp!itting organisms 100,000 Cellulose organisms 50,000 Having obtained the right bacterial balance, so tospeak, the aim of the management is to maintain looks like an inexhaustible volume of sludge whichconstantly varies in character (about 1,000 tons per day)is drawn to a locality literally surrounded with dwelling-houses, factories, etc., and formerly gave rise to loud andserious complaints. Now, this larg
Public works . per per at 20° C 52,000,000 15,700,000 at 37° C 5,000,000 3,000,000 Coli group 60,000 Proteus group 100,000 at least Denitrifiers 100,000 Fat-sp!itting organisms 100,000 Cellulose organisms 50,000 Having obtained the right bacterial balance, so tospeak, the aim of the management is to maintain looks like an inexhaustible volume of sludge whichconstantly varies in character (about 1,000 tons per day)is drawn to a locality literally surrounded with dwelling-houses, factories, etc., and formerly gave rise to loud andserious complaints. Now, this large mass of foul mate-rial is treated on the same site without any offencewhatever. Variation in the character of sludge is only to be lookedfor in a great manufacturing district where there are norestrictions on the discharge of trade waste into sewers;but these are sometimes very serious in their conse-quences, as when large discharges of tarry products fromcoal, water, or producer gas-plants suddenly SLUDGE AFTER THREE DATS IN THE DRYING BED. SLUDGE AFTER THIRTEEN DAYS IN THE DRYING BED. 212 MUNICIPAL JOURNAL AND PUBLIC WORKS Vol. XLVII, Xo. 14 The saving factor in the situation is the system ofseparate sedimentation and separate sludge-digestiontanks, so that whether it is a sudden increase of volumedue to rainfall or an overpowering mixture of antiseptics,the large number of sludge tanks in all states of fermen-tation renders the scheme at once elastic and capacity of the whole of the sludge-digestion appar-atus is equal to 165,000 cubic yards or ,000 gallons,which, with the present demand, means a time retentionof between four and five months. The average analysis of the sludge for the four years1915-1918 is as follows: Water per cent Dry solid matter Specific gravity of wet sludge (estimated) Specific gravity of dry solid matter and the average analysis of the dry solid matter is asfollows: Matter volatile at red heat 58
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
