Sewage disposal . f the general Columbus type, shown inFig. 97, with TVnozzle openings. Each orifice is rated to dis-charge gallons per minute under a 5-foot head, and there are211 nozzles to the acre. In order to secure more even distribu-tion each bed, or half-bed, was dosed in 1909 for successiveperiods under three different heads 4 feet, 7 feet and 9 feet; andbetween each period the bed was given a period of entire rest. TRICKLING FILTER INSTALLATIONS 373 The net result of this mode of operation is that the beds aredosed at a rate of about 4 million gallons per acre for half thetime,
Sewage disposal . f the general Columbus type, shown inFig. 97, with TVnozzle openings. Each orifice is rated to dis-charge gallons per minute under a 5-foot head, and there are211 nozzles to the acre. In order to secure more even distribu-tion each bed, or half-bed, was dosed in 1909 for successiveperiods under three different heads 4 feet, 7 feet and 9 feet; andbetween each period the bed was given a period of entire rest. TRICKLING FILTER INSTALLATIONS 373 The net result of this mode of operation is that the beds aredosed at a rate of about 4 million gallons per acre for half thetime, resting for the other moiety. The filtering layer itself is feet deep, the lower 10 inchesbeing 3-4 inch limestone and the rest inch material of thesame sort. 80,125 cubic yards of filling were used, costing inplace $ per yard. The floor of the filter is of 4-inch concreteand is practically covered with 6-inch notched half-tile, beddedabout I inch into the concrete, while it was soft (see Fig. 113).. Fig. 114. View of Columbus Filters in Operation (courtesy of J. H. Gregory). There are about 100 miles of this tile in the entire plant. Ageneral view of one of the filters is shown in Fig. 114. The effluent from the trickling beds is finally settled in twosettling basins, each having a capacity of 2,000,000 gallons. Thesludge from these basins is pumped out and discharged into theScioto River at times of high water; and when the river is abovea certain height the trickling effluent itself is discharged directlyinto the river without preliminary The principal results of sewage treatment at Columbus forseven years are shown in Table XCVI, taken from the AnnualReport of the Division of Sewage Disposal for 1915. 374 TREATMENT IN TRICKLING OR PERCOLATING BEDS TABLE XCVI ANALYTICAL SUMMARY COLUMBUS SEWAGE TREATMENT JVORKSParts per million. Year. Suspended matter. Dissolved oxygen consumed in 24hours at 37° C. Raw Tank Sprinkler Final Raw Tank Sprinkler- F
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1919
