When the 2004 Ballast Water Convention comes into force it is estimated that approximately 70 000 vessels will require functional certified Ballast Water Treatment Systems (BWTS). Certification testing to IMO D-2 regulations has involved both shipboard and land-based trials by a small number of test facilities world-wide. Compliance testing for enforcement purposes under the auspices of Port State Control, will include live/dead counts of residual organisms of different size classes in treated ballast water. However, technical problems in making counts of rare organisms, and difficulties in making live/ dead assessment of smaller non-motile organisms mean that comprehensive testing for full D-2 compliance will be a complex, time-consuming operation. Given the large numbers of commercial ships visiting several hundred ports world-wide and the limited resources for comprehensive testing, it is inevitable that more limited tiered approach to compliance enforcement will be required. Click Here For Complete Article Text
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