HEADING PAGE - port of ploce authority * welcome

ENVIRONMENTAL IMPACT STUDY
Rn: 03-033 CONTAINER TERMINAL PLOCE PAGE:56/11
Sedimentation time
PLS01 volume of
extracted water (mL)
PLS02 volume of
extracted water (mL)
10 min. 20 min. 30 min. 1 hour 2 hours 4 hours 24 hours
220 310 330 370 410 450 540
110 180 250 300 330 370 450
Table 7. Sedimentation dynamics of sediment mixture from the Port of Ploce and the sea
(40 % sediment and 60% water)
Different velocity of sedimentation of individual sediment layers is noticeable
being caused by their different grain size distribution. Upon 24 hours of
sedimentation, the extracted liquid in sediment sample PLS01 amounts to 90
% of added water volume and in the PLS02 75 %. Extracted water was almost
clear. Concentration of suspended substances in extracted water amounts for
the sample PLS01 = 7.3 mg/L and for the sample PLS02 = 8.0 mg/L
representing low values. Namely, according to the Regulation on Limit Values
for Indicators of Hazardous and other Substances in Waste Waters (Official
Gazette 40/1999 and 6/2001) the maximum permissible concentration for
discharge into waters of 2 nd category (the most sensitive recipients in which
discharge of waste waters is allowed) is 35 mg/L. Our opinion is that with
retention of dredged material in settling basins for a period of 24 hours the
possible adverse effects of its disposal to the sea and sea ecosystem quality
can be reduce largely.
BIBLIOGRAPHY AND USED DATA
1. Littoral Sea Quality Control, Project Vir – Konavle 2002, Oceanography
and Fishery Institute, March, 2003, p. 187.
2. Monitoring Programme of the Eastern Adriatic Coastal Area. Report for
1983. 1992., Institut za istraživanje mora Rovinj 1993., p. 100-111, 128-
143
3. P. Garrignes et al.: Distribution and Biotransformation of Aromatic
Compounds in Coastal Mediterranean Ecosystems. MAP Technical
Reports Series No 59, UNEP, Athens p. 211-212
4. Marine Habitat Committee, ICES CM 2003/E:04. Ref. ACME: Report of
the Working Group on marine Sediments in Relation to Pollution,
Tromso, Norway 2003.
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