Qi, Z;
Eames, I;
(2015)
Implications of ballast tank geometry and treatment technology on NIS removal.
Ocean Engineering
, 103
pp. 211-222.
10.1016/j.oceaneng.2015.04.046.
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Abstract
Regulation D-1 of the 2004 Ballast Water Management Convention requires that pumping seawater into a ballast tank should achieve a volumetric flushing efficiency of 95%. The IMO criteria for shipboard testing require a NIS removal rate of at least 90%. To examine the influence of tank geometry and treatment technology on satisfying IMO protocols, a general network model is developed and validated to analyse the transport of contaminants through a ballast tank. The model is applied to analyse the flushing from typical ballast tanks. For the hopper side and upper wing tank considered, setting a single outlet further from the inlet may effectively improve the flushing efficiency. For the ‘J’-type bottom and side tank considered, the flushing can be relaxed from 3 to 1.7 exchange volumes to save costs. The influence of treatment technology on the NIS removal rate is investigated in the closed-loop system. For the ‘J’-type tank considered, if the treatment efficiency is 70%, 2.4 times circulation is needed to achieve the 90% NIS removal rate.
| Type: | Article |
|---|---|
| Title: | Implications of ballast tank geometry and treatment technology on NIS removal |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.oceaneng.2015.04.046 |
| Publisher version: | http://dx.doi.org/10.1016/j.oceaneng.2015.04.046 |
| Language: | English |
| Additional information: | Copyright © 2015. This manuscript version is published under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International licence (CC BY-NC-ND 4.0). This licence allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licences are available at http://creativecommons.org/licenses/by/4.0. Access may be initially restricted by the publisher. |
| Keywords: | Ballast tank, ballast water, exchange volume, flushing efficiency, treatment efficiency, NIS removal |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1467160 |
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