Conservation by sanitation; air and water supply, disposal of waste, including a laboratory guide for sanitary engineers . or boilers and other manu-facturing purposes is another. Alum is valuable in that it doestake out and hold some of the ammonia, providing it is usedwithout lime or soda. Caustic lime unites with the carbonic acid and precipitates always increases the odor and ammonia and makes a mostobjectionable filtrate. Even just lime enough to neutralize theliberated acid from alum and to precipitate the aluminum hy-drate is objectionable for boilers. The ABC method, usingalum
Conservation by sanitation; air and water supply, disposal of waste, including a laboratory guide for sanitary engineers . or boilers and other manu-facturing purposes is another. Alum is valuable in that it doestake out and hold some of the ammonia, providing it is usedwithout lime or soda. Caustic lime unites with the carbonic acid and precipitates always increases the odor and ammonia and makes a mostobjectionable filtrate. Even just lime enough to neutralize theliberated acid from alum and to precipitate the aluminum hy-drate is objectionable for boilers. The ABC method, usingalum, blood, clay, and charcoal, proposed about 1870, was one ofthe earliest attempts at purification. Intermittent, downward filtration was even then consideredas the best process, and an opinion was given that this wouldbe the best plan for Worcester. 1 Waring, Newport Experiment above. DISPOSAL OF WASTES LIABLE TO CONTAMINATE 193 Neither from an engineering nor from a sanitary standpointdoes it seem necessary to spend much time discussing chemicalpurification of sewage, since we know no practical means of Nashua River.
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