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After delivering their cargo, empty commer … After delivering their cargo, empty commercial ships need to take up water from the port of arrival in order to maintain stability and ensure safe navigation conditions before heading back to the port of departure. This water, called ballast water, which contains aquatic organisms typical of the port of arrival, is stored in ballast tanks and is ultimately discharged at the port of departure when the ship is ready to be re-loaded. During this process, aquatic organisms capable of surviving in ballast water are released into new environments and can therefore become invasive species, causing serious economic and public health issues. Following the ratification of the International Maritime Organization (IMO)’s Ballast Water Management (BWM) Convention, commercial ships will have to treat their ballast water in order to comply with maximum discharge standards established for organisms in different size categories (IMO’s D-2 Standards and US Coast Guard Standards). However, some organisms are capable of surviving or even recovering after harsh treatments, leading to regrowth in ballast water tanks before discharge. In order to minimise regrowth and hence avoid exceeding discharge limits, different criteria such as duration of the journey, ballast water tanks capacity and water flow rate at intake and discharge, among others, should be considered when choosing an appropriate type-approved ballast water treatment systems (BWTS).ed ballast water treatment systems (BWTS).
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| rdfs:comment |
After delivering their cargo, empty commer … After delivering their cargo, empty commercial ships need to take up water from the port of arrival in order to maintain stability and ensure safe navigation conditions before heading back to the port of departure. This water, called ballast water, which contains aquatic organisms typical of the port of arrival, is stored in ballast tanks and is ultimately discharged at the port of departure when the ship is ready to be re-loaded. During this process, aquatic organisms capable of surviving in ballast water are released into new environments and can therefore become invasive species, causing serious economic and public health issues.serious economic and public health issues.
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| rdfs:label |
Regrowth inside ballast tanks
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