Take the chance to revisit our global webinar from June 2018, which offers valuable guidance for system selection. Our panel of experts, who share more than two decades of experience with ballast water treatment, take a thorough look at the claims and truths about cost of ownership, the importance of long-term support and the learnings of operational experience.
The panel of Alfa Laval’s ballast water management experts consists of:
Take this opportunity to hear from our experts on what you should consider when selecting a ballast water treatment system and supplier.
With experience gathered from over a decade of work with ballast water treatment, Alfa Laval has put together informative resources to help your decision process.
Compliance, regulations, editorials and product information
When planning for a ballast water treatment system, there are many questions that need to be asked. Here you will find answers to common questions, both about Alfa Laval PureBallast 3 and about the legislative issues surrounding ballast water treatment.
The differences between Alfa Laval PureBallast 3 and other systems are easy to explain and difficult to ignore. No other system comes close to its capabilities.
Simply put, PureBallast 3 provides fully compliant ballast water treatment without limiting your vessel’s operations or freedom of movement. Type approved by both IMO and the U.S. Coast Guard, it can perform:
This unique combination of capabilities ensures that you have a full range of options. Your ballast water treatment system will never restrict the place or manner in which you do business.
Added to this is the uncompromising construction of PureBallast 3. Built with non-corroding super austenitic stainless steel, PureBallast 3 reactors can be expected to last up to 20 years or more without replacement.
Many of the alternatives actually have their roots in drinking water treatment. Because they are adaptations of land-based technologies for water purification, they are less suited to common marine circumstances such as low UV transmittance. By contrast, the enhanced UV treatment technology in PureBallast 3 was developed specifically for marine use.
In PureBallast 3, the reactor’s UV lamps are combined with specially designed lamp sleeves of synthetic quartz. As well as optimizing the breadth of the wavelength spectrum, the sleeves have a high transmission efficiency that results in more UV light during disinfection. Combined with the flow-optimized design of the reactor interior, they ensure optimal UV dosage and low energy consumption.
Supporting the enhanced UV treatment is an extremely effective filter stage, which removes any larger organisms and particles prior to biological disinfection. Together, the filter and reactor stages enable full-flow treatment of fresh, brackish and marine water with UV transmittance as low as 42%. No other system can match this performance.
Without some form of cleaning, deposits of calcium carbonate and metal ions will build up on the quartz sleeves of the UV lamps in a ballast water treatment system. This will impair treatment, since less of the UV light produced by the lamps will be able to pass through.
Mechanical wiping is an alternative to CIP, but wipers are ineffective against the build-up of metal ions, which must be removed with a low-pH fluid. Nor do they clean the UV sensor within the reactor, which measures the UV transmittance. If the sensor and quartz sleeves are dirty, the system may use more power than necessary or be otherwise poorly controlled.
Any form of mechanical cleaning – including manual cleaning – will also lead to sleeve scratches. Eventually, these too will degrade the treatment performance.
Simply put, tests have shown that CIP has a valuable role in maintaining the biological disinfection performance of a ballast water treatment system. In a UV-based system, the effects are noticeable after a single cleaning operation. Moreover, by reducing energy use and maximizing the lifetime of the quartz sleeves, CIP has a long-term role in keeping operating costs down.
The answer is yes, in both respects.
PureBallast 3 Compact Flex is the answer to space and flexibility concerns. Ideal for most vessels, it arrives as loose components for installation freedom. Simply put, it packs the leading ballast water treatment system into the market’s smallest footprint – at reduced installation cost. Free placement of the lamp drive cabinet up to 30 m away allows further space savings in cramped spaces.
Where space permits, PureBallast 3 Compact can even be delivered as a skid-mounted, plug-and-play solution with the market’s smallest footprint., which even further simplify both Engineering and installation saving time and money.
PureBallast 3 non-Ex and Ex are both delivered in loose components, with high flexibility, with placement of the lamp drive cabinet up to 150 m away allows further space savings in the engine room, as well as placement outside the hazardous zone for Ex systems.
Because no salt or chemicals are used, there is no need for additional tanks or ventilation systems. Nor is any manual intervention – such as the opening and closing of valves – needed from the crew. Operation is fully automatic and started or stopped with a push of a button, either via the graphical touchscreen interface or via the vessel’s Integrated Ship Control System.
Efficiency can refer to two things in a ballast water treatment system: biological disinfection performance or energy consumption. In practice, however, these things go hand in hand.
In terms of biological disinfection performance, no system is more efficient at neutralizing ballast water than PureBallast 3. Only PureBallast 3 can perform in all water types and in water with UV transmittance as low as 42%. This it can do at full flow, i.e. without reducing the speed of ballast operations.
Because of its high performance, PureBallast 3 is also highly energy efficient. In most situations, it can run at just 50% of its potential operating power when sailing in IMO-regulated waters. Only when needed, for example in waters with extremely low UV transmittance, is it ramped up to its full installed power.
The following questions and answers explain the implications of Alfa Laval PureBallast 3 type approval according to the revised G8 guidelines.
Two additional land-based tests of biological efficacy, performed without holding time, had to be conducted in each water salinity. The component environmental tests are more in line with the requirements of U.S. Coast Guard (USCG). This means that the requirements are more stringent compared to the MEPC.174(58) 2008 G8 requirements. IMO accepts the use of the reproductive MPN method for evaluating biological efficacy tests, whereas the USCG requires the use of the CMFDA/FDA method.
A conductivity sensor is installed to determine which salinity the system is being operated in. Otherwise, the hardware, flow and power consumption are generally the same.
It is not necessary to upgrade. IMO has issued a resolution stating that vessels which have installed legacy systems should not be penalized.
Ship owners should consider when the system will be installed. If the system will be installed prior to 28th October 2020, an Alfa Laval PureBallast 3 system with type approval according to the 2008 G8 guidelines will be proposed. This system will be fully compliant with IMO regulations, now and in the future.