Abstract

This paper reports environmental study carried out in the seaport wear Petro-chemical Plant of Porto Torres (North-Western Sardinia) eight years after study where four areas at different level of pollution were described.
In the meantime specific, ecological plants are realized i.e. liquid effluent collectors, biological water treatment plant and a stelling basin of depurated effluents.
The present work shows a general improvement of the harbour area, as water quality and transparency, heavy metals content of sediments and aquatic flora.
In this way two different methods are used (synecological and chemical), i.e. mapping of biotic community, density of Posidonia oceanica seagrass, chemical analysis of oysters, posidonia's rhizome and leaf, water and sediments.

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