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Variable Nature of Chemical Composition of Sewage Sludges1

Variable Nature of Chemical Composition of Sewage Sludges1,10.2134/jeq1976.00472425000500030017x,Journal of Environmental Quality,L. E. Sommers,D. W.

Variable Nature of Chemical Composition of Sewage Sludges1   (Citations: 29)
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Sewage sludge samples were collected over a 2-year period from eight Indiana cities and analyzed for C, IM, P, K, Ca, Mg, Fe, Cd, Zn, Cu, Ni, and Pb. The sludges contained approximately 50% or- ganic matter and 1-4% inorganic C. Organic and inorganic C, or- ganic N, inorganic P, and Ca and Mg were found to be present in a given sludge at a relatively constant concentration with respect to sampling time. Inorganic N, organic P, K, and all metals were found to be quite variable with time for sewage sludge produced by a given city. In general, organic N and inorganic P constituted the majority of total N and P, respectively, in sludges. The largest de- viations between the mean and median were found for Cd, Zn, Cu, Ni, and Pb. Variable nature of inorganic N and metal contents of sludges indicates that a sound sampling and analysis program is es- sential prior to formulating recommendations for rates of sewage sludge applications on soils used for crop production.
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