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Today’s UV ballast water treatment systems are highly competitive for large flows

Recent market developments show a shift in thinking when it comes to ballast water treatment systems for tankers and other large vessels. Today more and more ship owners see advantages in choosing UV ballast water treatment over electrochlorination for large flows, even with respect to power consumption and footprint.

Marcus Hand, Editor

February 19, 2018

2 Min Read
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The idea that electrochlorination is more suitable for large flows than UV technology has persisted since the early days of ballast water treatment. Indeed, the first generations of UV treatment systems were often larger and more power-intensive. But modern solutions such as Alfa Laval PureBallast 3, the third generation of Alfa Laval’s ballast water treatment technology, are changing this preconception.

UV ballast water treatment systems now compete easily on power and footprint parameters, even at flows of 1500–3000 m3/h or above. As a result, their simplicity and lower operating costs are tipping the balance in major projects. Earlier this year, for example, Alfa Laval signed a deal to supply multiple vessels with PureBallast 3 systems for 3000 m3/h.  

Power and footprint on equal footing

As many shipowners have realized, the power consumption of today’s UV and electrochlorination systems is similar in practice. Electrochlorination systems are dependent on seawater temperature and salinity, which means they use considerably more power in low-temperature or low-salinity conditions. PureBallast 3 systems, as well as having effective power management, are certified for all water types and are completely unaffected by temperature or salinity.

In terms of footprint, UV ballast water treatment systems can actually be smaller than electrochlorination systems. With a range of four different reactor sizes, a PureBallast 3 system can be optimally configured to match the vessel and its ballast water flow. In part because no heaters or major auxiliaries are needed, UV systems are also easier and less costly to install.

Operational advantages with UV technology

When power consumption and footprint are largely equivalent, the operational advantages of UV treatment become compelling arguments against electrochlorination. In particular, UV treatment is both safer and easier for the crew.

Electrochlorination requires strong safety measures for chemical storage and handling. These may include explosion-proof storage compartments with additional ventilation, as well as additional safety equipment and crew training. Electrochlorination generates both hydrogen and chlorine gases, which are not only toxic, but also highly flammable if mixed.
By contrast, UV treatment systems are chemical-free and simple for the crew to handle. Because they generate no harmful substances, they require no measures to prevent corrosion or neutralize residual oxidants. In total, such factors mean less risk, less maintenance and less operating cost for the vessel.
Simply put, it may be worthwhile for ship owners to reconsider their stance when it comes to large ballast water treatment systems. Given the advances of recent years, operational factors may now be the deciding factor.

About the Author

Marcus Hand

Editor

Marcus Hand is the editor of Seatrade Maritime News and a dedicated maritime journalist with over two decades of experience covering the shipping industry in Asia.

Marcus is also an experienced industry commentator and has chaired many conferences and round tables. Before joining Seatrade at the beginning of 2010, Marcus worked for the shipping industry journal Lloyd's List for a decade and before that the Singapore Business Times covering shipping and aviation.

In November 2022, Marcus was announced as a member of the Board of Advisors to the Singapore Journal of Maritime Talent and Technology (SJMTT) to help bring together thought leadership around the key areas of talent and technology.

Marcus is the founder of the Seatrade Maritime Podcast that delivers commentary, opinions and conversations on shipping's most important topics.

Conferences & Webinars

Marcus Hand regularly moderates at international maritime events. Below you’ll find a list of selected past conferences and webinars.

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