Environmental Engineering Reference
In-Depth Information
With too many limiting factors for vessels discharging ballast water in a port, the
blanket approach becomes ineffective. Further to the feasibility, a decision on the
appropriate (blanket or selective) approach can be taken considering their advan-
tages and disadvantages which we summarize here:
The advantages of the blanket approach include:
-
low data requirements for the port State;
-
low skill requirements for the port State personnel to come to a RA result; and
-
simple implementation for the port State.
The disadvantages of the blanket approach include:
-
all vessels conduct BWM, even those that do not carry harmful organisms and
pathogens; 13
-
more burden on vessels crew by requiring “unnecessary” BWM measures;
-
more costs with BWM; and
-
depending on the BWM method used also some additional environment pollu-
tion or pressures. 14
The advantages of the selective approach include:
-
less “unnecessary” BWM burden for vessels;
-
lower costs for the shipping industry; and
-
less unnecessary environment pollution or pressures. 15
The disadvantages of the selective approach include:
-
more extensive data requirements 16 for port State;
-
more data and reporting requirements for vessels;
-
more complex BWM approach requiring the use of a RA system;
-
more complex BWM system requiring DSS;
-
higher skill and knowledge requirements for port State personnel; and
-
in cases of a lack of data or false data, the risk may be underestimated and con-
sequently “high risk” ballast water may be discharged.
As stated above, the implementation of the BWM Convention under the blanket
approach is clearly simpler. However, there are many factors arising from unique
situations/conditions worldwide that may limit the possibility of its implementation,
which, at the same time, favours the selective approach. On the other side, the
selective approach is without doubt more demanding, which would appear to limit
its application. Hence, appropriateness should be studied and decisions taken on a
case by case - port by port basis.
13 Source ports may be in the same region and not infected by harmful organisms and/or pathogens.
14 e.g., more oil consumption and gas emissions for creating more power supply necessary for
ballast water treatment or exchange, chemicals (active substances) used for treatment.
15 e.g., more oil consumption and gas emissions for creating more power supply necessary for
ballast water treatment or exchange, chemicals (active substances) used for treatment.
16 i.e., quantitative and especially qualitative.
Search WWH ::




Custom Search