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Water, Air, and Soil Pollution

, Volume 110, Issue 1–2, pp 67–79 | Cite as

Effects of Sewage on the Chemical Composition of Piracicaba River, Brazil

  • Luiz A. Martinelli
  • Alex V. Krusche
  • Reynaldo L. Vicgoria
  • Plinio B. De Camargo
  • Marcelo Bernardes
  • Epaminondas S. Ferraz
  • Jorge M. De Moraes
  • Maria Victoria Ballester
Article

Abstract

Water samples were collected from 7 locations along major rivers of Piracicaba River basin for 22 months. The 4 upstream points represent non-polluted sites and the 3 downriver points represent polluted sites. Due to sewage input, concentrations of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), major conservative cations and anions increased significantly in the polluted sites. The major increases were observed for sodium, chloride and sulfate. Nitrate was an exception for this pattern, with similar concentrations between polluted and non-polluted sites. The probable cause was reduction of nitrate to ammonium in the polluted sites, where anoxic conditions prevail. Most of the variables had an inverse correlation with water discharge, especially in the polluted points. The sewage load was diluted by precipitation and surface waters.

Brazil Piracicaba river sewage water chemical composition 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Luiz A. Martinelli
    • 1
  • Alex V. Krusche
    • 1
  • Reynaldo L. Vicgoria
    • 1
  • Plinio B. De Camargo
    • 1
  • Marcelo Bernardes
    • 1
  • Epaminondas S. Ferraz
    • 1
  • Jorge M. De Moraes
    • 1
  • Maria Victoria Ballester
    • 1
  1. 1.Centro de Energia Nuclear na AgriculturaBrazil. E-mail

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