Istituto di Scienze Marine     
Cozzi S., Reisenhofer E., Di Monte L., Cantoni C., Adami G. Effect of environmental forcing on the fate of nutrients, dissolved organic matter and heavy metals released by a coastal wastewater pipeline. In: Chemistry and Ecology, vol. 24 (2) pp. 87 - 107. Taylor and Francis, 2008.
Discharges of nutrients, urea, dissolved organic matter and heavy metals by a sewage underwater pipeline are analysed in comparison to environmental conditions in a shallow coastal zone. Variable thermo-haline stratifications of the water column and currents in upper (2.62-34.97 cm s−1) and deeper (0.83-10.91 cm s−1) layers drive vertical diffusion and lateral transport of wastewaters. Loads of reactive phosphorus (0.13 tons d−1) and ammonium (1.62 tons d−1) by the pipeline are not negligible compared to the major river loads in the gulf. High concentrations of urea (≤11.51μmol N dm−3) were found in the area of wastewater release. Ammonium uptake (6.14-534 nmolNdm−3 h−1) strongly exceeded nitrate uptake(0.19-138 nmolNdm−3 h−1), indicating that discharges of ammonium by the pipeline are actively assimilated by plankton community even at low levels of light. Distribution of Zn (≤27.7 ppb), Cu (≤25.6 ppb), Cd (≤0.80 ppb) and Pb (≤13.5 ppb) in the water column and the measurement of their complex-forming capacity in seawater did not indicate a persistent perturbation of the pelagic environment due to heavy metals.
URL: http://www.tandf.co.uk/journals/titles/02757540.html
DOI: 10.1080/02757540801919354
Subject depurazione acque reflue
Waste water

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