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Laboratory tests on heat treatment of ballast water using engine waste heat

Balaji, Rajoo and Lee Siang, Hing and Yaakob, Omar and King Koh, Kho and Adnan, Faizul Amri and Ismail, N. and Ahmad, Badruzzaman and Ismail, M. and Wan Nik, W. B. (2018) Laboratory tests on heat treatment of ballast water using engine waste heat. Environmental Technology (United Kingdom), 39 (9). pp. 1102-1114. ISSN 0959-3330

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Official URL: http://dx.doi.org/10.1080/09593330.2017.1321691

Abstract

Waste heat recovery from shipboard machineries could be a potential source for heat treatment of ballast water. Similar to a shipboard schematic arrangement, a laboratory-scale engine-heat exchanger set-up harvesting waste heat from jacket water and exhaust gases was erected to test the level of species’ mortalities. Mortalities were also assessed under experimental conditions for cultured and natural plankton communities at laboratory level. Effect of pump impellers on species’ mortalities were also tested. Exposures between 60°C and 70°C for 60 sec resulted in 80–100% mortalities. Mortalities due to pump impeller effects were observed in the range of 70–100% for zooplankton. On the laboratory-scale arrangement, >95% mortalities of phytoplankton, zooplankton and bacteria were recorded. It was demonstrated that the temperature of tropical sea waters used as secondary coolant can be raised to cause species’ mortalities, employing engine exhaust gases. The results also indicated that pump impeller effects will enhance species’ mortalities. The limitations of the shipboard application of this method would be the large ballast volumes, flow rates and time for treatment.

Item Type:Article
Uncontrolled Keywords:Ballast water, heat effect
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:85650
Deposited By: Widya Wahid
Deposited On:07 Jul 2020 05:16
Last Modified:07 Jul 2020 05:16

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