Author(s)

D Radan & J Lovric

Abstract

Heat has been proved to be a very attractive method of minimizing the risk of introducing new organisms into the ports where ballast is discharged. It does not necessitate the use of chemicals or biocides that could be harmful to the environment. Waste heat from a ship's main engine can potentially provide a cost effective source of heat. An analysis of available heat and methods to obtain required ballast water temperature with maximum efficiency is the main concern of this paper. To obtain required ballast water temperature without affecting engine performance and fuel consumption appropriate modifications of ballast piping and diesel engine conventional and central cooling systems have been proposed. 1 Introduction Heat is one of the options for ships ballast water treatment that is receiving considerable research attention. Heating of ballast water needs to take place during transit while ship's main engine is running. All explored options are based on biological heat treatment strategies, which are shown in table 1. It is very hard to determine the duration of exposure at temperature sufficient for complete organ- ism inactivation because of the huge amount of marine species contained in bal- last water. Therefore, only the most resistant organisms have been tested [l], [2].

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