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Stemming the Tide Controlling Introductions of Nonindigenous Species by Ships' Ballast Water (1996) / Chapter Skim
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6 CONCLUSIONS AND RECOMMENDATIONS
Pages 86-92

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From page 86...
... A significant known pathway for species introduction is through ships' ballast water, the use of which is necessary for safe ship operations. The committee reviewed the state of practice of the prevention and control of nonindigenous species introduction in ships' ballast operations, and assessed potential alternative control strategies and management options for biological efficacy and practicability and for their impacts on ship and crew safety and on the environment.
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From page 87...
... Experience with land-based waste water treatment systems is a useful starting point for assessing candidate technologies for treating ballast water on board ships. However, the operational constraints associated with shipboard use, including the high flow rates associated with pumping ballast water and the presence of sediment, impose additional demands on candidate systems.
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From page 88...
... Continuous backwash filtration is the most favorable candidate technology for use on board ships based on environmental, health, safety, effectiveness, and cost considerations. The size of current media filtration systems precludes their use on board ship, but their performance and design could be optimized for compatibility with ships' operations, for example, by reducing their size and providing the capability to handle high flow rates.
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From page 89...
... One proposed approach to monitoring shipboard management practices involves a "sampling and dispatch" method. Chronic carriers of known unwanted aquatic species would be required to air freight samples of their ballast water to authorities at the destination port for testing.
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From page 90...
... National research and development, including one or more demonstration projects, should focus on the following: · optimizing the filtration approach to treating ballast water · identifying the level of biological activity that indicates that treatment has reduced the risk of species introduction to an acceptable level · developing automated monitoring systems suitable for shipboard use To avoid duplication of effort, these activities should take into account related research and development in other countries. Recommendation to the Aquatic Nuisance Species Task Force.
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From page 91...
... Samples should be tested to agreed-upon international standards to facilitate comparisons of the water of each ballast uptake port with the water of receiving ports. Recommendation for the member states of IMO.
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Key Terms

  • treating ballast
  • board ships
  • voluntary guidelines
  • managing ballast
  • nuisance species

  • aquatic nuisance
  • existing voluntary
  • aquatic species
  • cargo plan
  • changing ballast

  • species task
  • water operations
  • unwanted aquatic
  • species introduction
  • aquatic organisms

  • nonindigenous aquatic
  • estuarine waters
  • control strategies
  • ballast operations
  • destination port

  • water introductions
  • thereby raising
  • living organisms
  • constraints associated
  • backwash filtration

  • introducing unwanted
  • candidate technology
  • controlling ballast
  • assessing candidate
  • air freight


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