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• W2043288362 abstract "Purification of creamery wastes has become a vexing question in many localities. In some instances city officials have prohibited creameries from discharging wastes into municipal sewerage systems because of fear of disrupting the city sewage disposal plant. Is there any basis for this apprehension and, if there is, what are the properties or peculiarities of creamery wastes that render them so troublesome? These questions may best be answered by comparing municipal sewage and creamery wastes as to composition, and by consideration of the nature of the changes tak ing place when these wastes are subjected to sewage treatment processes. The oxygen consuming power and the concentration of nitrogenous sub stances are two convenient measures of the character of sewage or trade waste. Ordinary sewage rarely contains over 25 milligrams of nitrogen (as NH3 and organic nitrogen) per liter, whereas creamery wastes generally contain about twice as much, and not infrequently four to six times as much nitrogenous matter. The really significant difference, however, is with respect to the oxygen-consuming properties. Muncipal sewage generally consumes about 50 milligrams of oxygen per liter when treated with an oxidizing agent such as potassium permanganate, whereas creamery wastes similarly treated consume from 600 to 1500 milligrams of oxygen, or 12 to 30 times as much as domestic sewage. The ratio of oxygen-consuming to nitrogenous constituents in domestic sewage is about 2.5 to 1, whereas in creamery wastes it is generally 10 or 12 to 1. This high ratio is due to the presence, in creamery wastes, of lactose (milk sugar) which is practically, if not entirely, absent from domestic sewage. It is the presence of this lactose which is really at the bottom of the difficulties encountered in treatment. Why should one expect a municipal treatment plant, designed for domestic sewage, to treat ade quately a trade waste so markedly different as regards quantity and quality of organic constituents? When ordinary sewage enters a septic or Imhoff or other tank from which air is excluded, a large portion of the solids settles out; the clarified effluent, which has been but slightly changed as respects reaction, passes on to the filters or other purification devices, and the settled solids are gradually proteolyzed or digested, i. e., transformed into liquid or gaseous" @default.
• W2043288362 created "2016-06-24" @default.
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• W2043288362 date "1929-12-01" @default.
• W2043288362 modified "2023-09-27" @default.
• W2043288362 title "Biological Purification of Creamery Wastes" @default.
• W2043288362 doi "https://doi.org/10.1021/ie50240a017" @default.
• W2043288362 hasPublicationYear "1929" @default.
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