Water/Wastewater
New UV disinfection system helps operators meet IMO discharge regulations
Mar 18 2009
To assist operators of cruise ships, tankers, semi-submersibles, jack-up rigs and other large ocean-going vessels to meet the International Maritime Organisation’s (IMO’s) impending ballast water discharge requirements, UV disinfection specialist Hanovia (UK) has partnered with three of the world’s leading systems integrators to provide validated, on-board water treatment systems that are easy to install and use.
All ocean-going vessels take on water to provide ballast and stability. It is usually taken on in coastal port areas and transported to the next port of call – sometimes on the other side of the world – where it may be discharged. Much of this water contains marine microorganisms such as zooplankton, algae, bacteria and the eggs, cysts and larvae of various species. While many die in transit, some survive and invade the local marine environment, out-competing native species and causing serious damage to native ecosystems. Environmental damage caused by ballast water is now regarded as one of the greatest threats to the world’s oceans. Two methods have been proposed to combat this problem: onboard ballast water treatment and ballast water exchange. As the name suggests, ballast water treatment involves treatment of ballast water prior to discharge, while ballast water exchange involves ballasting and de-ballasting in the open ocean before coming into ports and coastal waters. This open ocean exchange is not an ideal solution as it is potentially unsafe and can destabilise the vessel. Also, because existing ballast water exchange systems do not completely drain the tanks, sediment and a residual amount of water can remain, leaving behind non-indigenous species which could be discharged in port later.-as-feedstock.jpg)
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