Biological disinfection, which is the main treatment process, occurs within an enhanced UV reactor. The reactor has a flow-optimized interior that ensures high turbulence and the concentration of the UV dose.
The medium-pressure UV lamps within the reactor employ specially designed lamp sleeves of synthetic quartz. These unique sleeves support transmission of a broader wavelength spectrum and provide more UV light during disinfection. Combined with the reactor’s internal design, this ensures optimal UV dosage and low energy consumption.
Supporting the reactor is a filter stage, used to remove any larger organisms and particles prior to biological disinfection. This improves the quality of water for treatment, especially when operating in cloudy coastal waters and fresh water.
In combination with the reactor, the effective basket filter design enables full-flow treatment of fresh, brackish and marine water with UV transmittance as low as 42%.
Alfa Laval PureBallast 3.1 Compact Flex is the answer to space and flexibility concerns. Ideal for most vessels, it arrives as loose components for installation freedom, flows 32-1000 m3/h.
PureBallast 3.1 Compact Flex is an inline system designed for high flexibility and a minimal footprint. The treatment stages are integrated into the ballast water piping as inline components, and with simple plug-and-play contacts it reduces both engineering and installation time and cost, making it the perfect fit for most installations.
The additional components are support systems that can be flexibly placed for an optimal design.
A broad range of auxiliary equipment is available to support integration into any vessel, including backflush pumps, sampling points, valve packages and remote control panels.
Alfa Laval PureBallast 3.1 Compact can be delivered as a skid-mounted module, this makes it not only compact, but also easy to install due to minimized pipework. The skid has a minimal footprint and is connected via simple plug-and-play contacts. For flows of 32-300 m3/H.
All components are incorporated into the skid, apart from an electrical cabinet that is flexibly placed. This cabinet is a combination of the lamp drive cabinet and control cabinet of larger systems.
The following components are incorporated into the
PureBallast 3.1 Compact skid-mounted:
A broad range of auxiliary equipment is available to support integration into any vessel, including backflush pumps, sampling points, valve packages and remote control panels.
Alfa Laval PureBallast 3.1 is available in loose components, and feature a separate Control Cabinet with 15” graphical touchscreen interface that is easy and intuitive to use,lamp drive cabinet that can be placed up to 150m away from the reactors for installation flexibility. UV lamp performance is safeguarded by an automatic CIP cycle. The CIP unit circulates a reusable, non-toxic and biodegradable cleaning solution that prevents any UV-impairing build-up.
The additional components are support systems that can be flexibly placed for an optimal design.
A broad range of auxiliary equipment is available to support integration into any vessel, including backflush pumps, sampling points, valve packages and remote control panels.
PureBallast 3.1 is available in a range of Ex configurations, for example for Zone 1, IIC and T4 compatibility. Ex designs are simplified by the flexible placement of the lamp drive cabinets, which can be located outside the hazardous zone and up to 150 m away from the reactors they serve.
Certain standard features are also relevant to Ex systems. For example, the reactor temperature and level sensors are connected via safety relays that bypass the PLC, which prevents their signals from being missed in the unlikely event of a PLC malfunction.
PureBallast 3.1 is a fully automated system. When initiated, it undergoes a brief start-up sequence.
When ballasting begins, the incoming ballast water first passes through the filter stage. This removes any larger organisms and particles, which improves the quality of the water for treatment. The filter stage is of benefit for operation in cloudy coastal waters and fresh water.
After filtration the water continues through the reactor stage, where it is disinfected by means of enhanced UV before entering the ballast water tanks.
Once ballasting is complete, reactor cleaning is performed via an automatic Cleaning-In-Place (CIP) cycle. This cycle is prompted immediately after ballasting and should be performed within 30 hours. The reactor stage is rinsed with fresh water when the CIP cycle begins and filled with fresh water upon its completion.
The filter stage is also filled with fresh water once ballasting is completed.
The deballasting process is essentially the same as the ballasting process. However, the filter stage is bypassed during deballasting since the water has already been filtered.
After leaving the ballast water tanks, the outgoing ballast water passes through the reactor stage to eliminate any regrowth of microorganisms that may have occurred in transit. Having thus been disinfected to the established limits, it is discharged into the receiving water at the deballasting site.
The same start-up and shutdown sequence, including CIP, is employed during both ballasting and deballasting.
Alfa Laval PureBallast 3.1 Compact Flex product leaflet Alfa Laval PureBallast 3.1 Compact product leaflet Alfa Laval PureBallast 3.1 product leafletDirect assistance from Alfa Laval is also available to aid design and planning, as well as in the installation and commissioning processes.
To obtain design and installation documentation or more information, please contact Alfa Laval.
Download Alfa Laval’s ballast water management resources to learn more about PureBallast 3.1 and how it compares to other available treatment technologies.
