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Study of influencing factors on ballast water exchange
Ballast water is carried in a ship’s ballast tank to keep stability, trim and structural integrity, inside which the non-indigenous species, including various life stages of aquatic microbes, plants and animals, may be invasive and harmful to new native ecosystem. Thus, ballast water is required by the International Maritime Organization to be treated on the basis of exchange or performance standard before discharge. Currently, the main treatment technologies include mechanical methods as pretreatment for solid-liquid separation, physical and chemical methods for disinfection. The treatment efficiency depends on both the cleaning and exchange processes, but the exchange efficiency and the relationship between flushing efficiency and cleaning efficiency have not been clearly understood, so it is necessary to study the influencing factors of flushing efficiency by fluid mechanics. Experimental methodology and diagnostic tools have been developed to analyse flushing from ballast tanks at present. A multi-compartmented ballast tank was studied in our lab, and MATLAB Image Processing Toolbox was employed to analyse the flushing process. It has been found the flushing efficiency is influenced by flow regime, outlet position and density contrast. Next a new tank with different structure will be built up to investigate the geometry influence.
1 Researchers
  • Dept of Mechanical Engineering
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