. Public health and preventive medicine. refuse may be used formaking artificial manure, in which case it is either washed, or washed andfiltered, to effect a separation of grit, slop, and water. The slop is then utilised,the grit being used for building purposes, and the water passing to the sewer. (4) This is the process coming more and more generally into use, and it hasfor its object an efficient and cleanly disposal, together with some reimburse-ment from the resulting clinker, which is now being made into a form ofconcrete for building purposes, and may be used to make roads, mortar, or
. Public health and preventive medicine. refuse may be used formaking artificial manure, in which case it is either washed, or washed andfiltered, to effect a separation of grit, slop, and water. The slop is then utilised,the grit being used for building purposes, and the water passing to the sewer. (4) This is the process coming more and more generally into use, and it hasfor its object an efficient and cleanly disposal, together with some reimburse-ment from the resulting clinker, which is now being made into a form ofconcrete for building purposes, and may be used to make roads, mortar, or asfuel. Further, the destructor heat may be utilised for ventilation, lighting,and disinfection in various ways. DISPOSAL OF SEWAGE 389 Destructors are of two kinds—(a) the slow combustion furnace, which isused without a forced draught, and does not attain so high a temperature, or inthe same time consume so much refuse, as (//) the high temperature or forceddraught furnace. The essential parts of a destructor (Fig. 174) are a sorting. Fig. 174.—Refuse destructor, a, Opening for refuse, b, Inclined hearth, r, Dry-ing floor, d, Fire bars, e, Reverberatory arch. /, Clinker door. ;/, Openingfor gases, m, Ashpit, n, Main flue, p, Mattress opening. floor, feed-hoppers, through which the refuse is pushed to inclined dryinghearths, a cell or combustion chamber, an ashpit, and main flue ending in atall chimney. Some forms have fume cremators (Fig. 175), which consist ofa secondary furnace placed between the cells and the main shaft. It isdesigned to consume the fumes, and is fed with coke breeze. So placed, how-ever, such fume cremators are apt to interfere with the draught, so that another method is to have special fire-brickarches in connection with the fur-nace cells. Through these thefumes pass to the shaft, heing com-pletely oxidised en route. In thesecond class the forced draught isobtained by means of fans or steam-jet blowers, and a temperature of2000° F. secured. The chim
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectprevent, bookyear1902
