Public works . ne blue test. The contract for the fine screen was let in the springof 1918, and the screen placed in operation about a yearago. This screen is of the R. W. type, ten feet in diam-eter and set at 15 degrees with the horizontal. Theorifices are slots one-sixteenth of an inch wide. Thereare no slots in the hat or projecting part of the screen,which is of solid plates. The bristle larushes brush thescreenings into and through a trough, from which theydrop into a box about two feet below. Originally, it wasintended to brush the screenings into tubs, each holdingabout 8 cubic feet, b
Public works . ne blue test. The contract for the fine screen was let in the springof 1918, and the screen placed in operation about a yearago. This screen is of the R. W. type, ten feet in diam-eter and set at 15 degrees with the horizontal. Theorifices are slots one-sixteenth of an inch wide. Thereare no slots in the hat or projecting part of the screen,which is of solid plates. The bristle larushes brush thescreenings into and through a trough, from which theydrop into a box about two feet below. Originally, it wasintended to brush the screenings into tubs, each holdingabout 8 cubic feet, but these were found to be too heavyfor the men to handle. Instead, an attendant visits thescreen about once an hour during the day and shovelsthe screenings from the trough into a self-loader, whichwas home-constructed and consists of a wooden chutewith one-half its length overhanging and held in horizon-tal position by means of a latch. A wagon backs in underthe overhanging end of the self-loader, the latch is. FOAMING IN TANK XO. OVERFLOWIXG GAS VENTS, knocked out and the screenings are dumped into thewagon. The self-loader holds one days collection ofscreenings at the present time, which amounts to abouttwo cubic yards measured after draining about twelvehours. The screen removes about 15 per cent of the suspendedsolids, this figure being obtained by weighing an entiredays screenings and reducing them to a dry basis andcomparing them with the suspended matter in the efflu-ent from the screen, also reduced to a dry basis. Quitea number of small pieces of paper up to two or three inch-es square are found to slide through the slots, and con-siderable fecal matter is washed through or pushedthrough by the brushes, so that the effluent does not lookgreatly dissimilar from the ordinary crude sewage. believes, however, that the solids removed con-tain a large percentage of those which caused the foam-mg trouble, and that the improvement effected is muchgreater than that i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
