[OANNES Foro] A case study of sewage discharge in a shallow coastal area

[Mario Cabrejos]

Marine Ecology
Volume 29 Issue 4, Pages 483 - 494
Published Online: 7 Oct 2008
DOI 10.1111/j.1439-0485.2008.00257.x

A case study of sewage discharge in the shallow coastal area
of the Northern Adriatic Sea (Gulf of Trieste)
Patricija Mozetic mozetic en mbss.org, Vlado Malacic & Valentina Turk 
 Marine Biology Station, National Institute of Biology, Fornace 41, 6330 Piran, Slovenia.  

ABSTRACT
A case study was carried out in 2000 in the shallow coastal area of the Northern Adriatic Sea (Gulf of Trieste) where untreated domestic sewage and industrial wastes are discharged at rate of 5500 m3·day?1. The sewage plume above the outfall was followed using faecal coliforms (FC) and overturning length scale (lT). The latter was rejected as a marker as the discharge conditions prohibit following the turbulence of sewage water. Intermittent sewage discharge is reflected in the minimal effect of eutrophication. Increase of phytoplankton biomass is thus only minor compared with the unpolluted area regardless of elevated concentrations of sewage-derived nutrients (confirmed by correlation coefficients between FC and NH4+, TP, PO43?: 0.78, 0.71 and 0.67, respectively). Deteriorated trophic status, determined by the TRIX index, was observed only in the surface layer (average TRIX: 5.67). High FC content well above the regulation limit (up to 2.6 × 105 FC·100 ml?1) represents, therefore, the major negative impact of the improperly treated waste for the risk to human health. 
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