This paper discusses the prediction of the mass-of-contaminant remaining in ballast water tanks as they are purged by fresh sea water or by sterilised discharge water. The purging is assumed to take place under steady-flow conditions. Further, the assumption is made that the process involved is, in chemical engineering terms, a perfect- or well-mixed one. In view of the long residence-time likely, such a model is the most rational choice among the standard models used in mixing theory. However, a short discussion is given on possible ways of enhancing the mixing, of which careful distribution of the flow from the inlet-piping design within a tank, would be helpful. Whether extensive and expensive computational fluid dynamic studies are justified for designing the necessary pipe-work is queried.

    A number of examples with interconnection between tanks are worked through – the associated modelling and mathematics is straightforward. A result of some significance emerges; that judicious arrangements of tanks, in series and/or parallel, has the potential to make for large savings in time-of-operation and in energy expenditure.

    The arrangement whereby sterilised outflow-water is used as the inflow, ie a closed system, may be particularly useful for short-haul vessels or those operating in lakes and rivers.


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    Titel :

    On continuous-flow techniques for the purging of contaminated water in ballast water tanks


    Beteiligte:
    Flower, J O (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.01.2002


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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