Effects of sewage on the chemical composition of Piracicaba River, Brazil

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...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 1999-02, Vol.110 (1-2), p.67-79
Main Authors: MARTINELLI, L. A, KRUSCHE, A. V, VICTORIA, R. L, DE CAMARGO, P. B, BERNARDES, M, FERRAZ, E. S, DE MORAES, J. M, BALLESTER, M. V
Format: Article
Language:English
Subjects:
Ammonium
Anions
Anoxic conditions
Applied sciences
Brownfields
Carbon
Cations
Chlorides
Continental surface waters
Dissolution
Dissolved inorganic carbon
Dissolved organic carbon
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental monitoring
Exact sciences and technology
Freshwater
Natural water pollution
Nitrates
Pollution
Pollution, environment geology
River basins
Rivers
Sewage
Sodium
Sulfates
Surface water
Water analysis
Water sampling
Water treatment and pollution
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Summary: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.
ISSN:0049-6979
1573-2932
DOI:10.1023/A:1005052213652