The Alfa Laval PureBallast 3.2 is the 3rd generation of the PureBallast technology. It is the leading ballast water treatment system and it is the first solution to be revised g8 ready. The PureBallast systems is chemical free and has the USCG type approval, from the US Coast Guard (USCG), as well as by International Maritime Organization (IMO).
Pureballast offers an outstanding performance in all kind of water salinities and are certified in all types of water: fresh, brackish and marine.
The type approved PureBallast system is the most established system on the market with over a decade of experience in merging compliance with practical needs. The system is a highly flexible system for the biological disinfection of ballast water. The system uses the latest ultraviolet (uv) treatment technology - also referred to as ultraviolet transmittance (UVT) which is the measurement of how much ultraviolet light is able to pass through water. UV treatment is a well-known technology that has been used for over 100 years to disinfect drinking water. The UV system represents the most common way of physical disinfection and removes organisms in accordance with stipulated limits. This system requires no minimum holding time and offers short treatment time as well as minimal space requirements. No harmful by-products or residual disinfectants is generated unlike when using chemical disinfection methods. The UV systems have little or no impact on the environment and do not contribute to corrosion inside the ballast tanks.
This system works when ballast water is taken into a chamber to disinfect or a reactor, where UV lamps produce light at wavelengths of around 185 or 254 nm. But it will depend on the types of lamps and the quality of the quartz glass sleeves/tube. The UV light is constant monitored through the system operation to secure the required dose and the correct intensity for a maximum efficiency.
When deballasting from the ballast tanks, ballast water is pumped back through the reactor, where the final treatment takes place before discharging. This technique by treating during both ballasting and deballasting will ensure minimal risk for regrowth in the tanks which would lead to non-compliance. This systems water flow will therefore not have to use mechanical filtration in any aspect of the process.
Components of the PureBallast 3.2
Pure ballast is available in EX configurations according to ATEX and IECCEx, Zone 1, IIC and T4. In addition to the following, it is possible to choose a wide range of auxiliary equipment that will fit all types of vessels/assets.
System components - biological disinfection:
- Filter: In the PureBallast system a filter is used to block the bigger organisms and reduce sediment in the tanks during ballasting. When deballasting, this filter is automatic cleaned because of the backflush using a small portion of the water flow.
- Reactor: In the reactor of the system the UV treatment is located. These reactors are available in four sizes and each with integrated flow-optimized elements that will ensure high turbulence and the concentration of the UV dose. These reactors contains specialized lamp sleeves of synthetic quartz, with the advantage of a broader wavelength spectrum which will generate more UV lighting during its operation. To prevent corrosion the reactor is made of SMO steel, and level as well as temperature sensors is establishing as a safety precaution.
System support components:
- Lamp drive cabinet: Is a power supply for the UV lamps and are associated with the reactor. This cabinet can be placed in up to 150 meters away from the reactor, which can make more space in the engine room.
- Cleaning in place (CIP) unit: This CIP safeguarding the performance of the UV lamps in an automated CIP cycle and in a non-toxic solution. This is to prevent any potential UV impairing in the sleeves.
- Control cabinet: The system is controlled by an easy to use touchscreen and will make it possible to start and stop with just a single touch. The cabinet can be integrated in the vessel, rig, bulk carrier or ship control systems.
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