Ocean outfall of Santoss sewage: contribution on the sediment of fund to Al, Mg, K, Ca, Fe, Ti, Na, Si, Ba, Cu, Zn, Cr, Mn, Co, Ni e S / Emissário submarino de Santos: contribuição nos sedimentos de fundo para Al, Mg, K, Ca, Fe, Ti, Na, Si, Ba, Cu, Zn, Cr, Mn, Co, Ni e S

AUTOR(ES)

Debora dos Santos Mandaji

DATA DE PUBLICAÇÃO

2008

RESUMO

After the construction of the Ocean Outfall of Santoss sewage, all of Santoss and part of São Vicentes effluents started to be discarded in the Santos Bay after Preconditioning. In light of that aspect, CETESB began a monitoring control of the materials dumped through the emissary. In this dissertation sediments samples in the environment of that monitoring mesh. From two collections in different periods - April 2004 and October 2004 - 20 samples of sediments were obtained. Granulometric and chemical analyses (larger and trace elements for DRX and ICP-OES for 16 elements with prevalence of metals) were developed. The granulometric results obtained in the sediment samples showed that those were predominantly constituted by sands and sediments in suspension. The dispersion of the prior fractions suffers direct influence of the flow of discarded materials by the emissary. Of the several analyzed elements, it was detected that the Cobalt (Co) and Sulfur (S) concentrations surplused the reference limits. The element Barium (Ba) was always highly concentrated in analysis. It was noticed, on the other hand, that the distribution of the elements Copper (Cu), Zinc (Zn), Chromium (Cr), Manganese (Mn) and Nickel (Ni), always exhibited larger concentrations in the period of greater rainfall. Those results corroborate the indicators that some of those chemical elements (Cu, Zn, Cr, Mn and Ni) comes from materials of naturally eroded rocks and that other elements (Co and S) were deposited by the emissary, constituting anthropogenic actions. The determination of the Carbon/Nitrogen (C/N) and Carbon/Sulfur (C/S) reasons didnt determine if the deposit of the emissarys effluents contributes in the increase of the concentration of organic matter. The results and interpretations obtained in the experiments confirm the emissarys influence on the environments bottom sediments. Those results point that the effluent treatment in the Sewers Pre-conditioning Station in Santos is not ideal, because some elements, considered pollutants, are found in deposits in the analyzed sediments.

ASSUNTO(S)

marines sediments efluentes santos santos: outfall ocean metais effluents metals emissários submarinos

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