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This article in JEQ

  1. Vol. 5 No. 3, p. 303-306
     
    Received: Oct 10, 1975


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doi:10.2134/jeq1976.00472425000500030017x

Variable Nature of Chemical Composition of Sewage Sludges1

  1. L. E. Sommers,
  2. D. W. Nelson and
  3. K. J. Yost2

Abstract

Abstract

Sewage sludge samples were collected over a 2-year period from eight Indiana cities and analyzed for C, N, P, K, Ca, Mg, Fe, Cd, Zn, Cu, Ni, and Pb. The sludges contained approximately 50% organic matter and 1–4% inorganic C. Organic and inorganic C, organic 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 deviations 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 essential prior to formulating recommendations for rates of sewage sludge applications on soils used for crop production.

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