Modular options increase water-cleaning capacity
As before, the foundation of the PureSOx WCS is high-speed centrifugal separation. This is a core technology in which Alfa Laval has well over a century of experience, as well as the most effective method of cleaning water at sea. In the new modular system, the separator module can be combined with a flocculator or a membrane module for additional capacity, either directly or through a later upgrade.
“The modular additions allow the best and most cost-effective fit for the customer’s needs, building on the proven effectiveness of the centrifugal separator,” says Haveman. “Vessels with high engine power, such as mega-container vessels and cruise ships, will benefit especially from the addition of membranes, which increase the volume of water that can be cleaned effectively.”
New features lower closed-loop operating costs and increase safety
Still more benefits are achieved through two features that are new to the PureSOx WCS. One is the ability to use either NaOH or non-hazardous Mg(OH)2 as the alkaline additive, based on which is desired or most affordable at the time. The other is the option of using seawater rather than fresh water for replenishing the water system, which yields lower energy costs.
“Unless it’s bunkered, fresh water has to be produced on board, which means using it for closed-loop scrubbing adds to the energy equation,” says Haveman. “Seawater replenishment makes economical use of water that’s readily available to the vessel.”
A flexible hybrid offering – proven in 10 years at sea
With the new capabilities of the PureSOx WCS, Alfa Laval adds strength to an already convincing hybrid system offering. Hybrid PureSOx systems have excelled in a decade at sea, ever since the very first PureSOx system – also a hybrid – set sail on DFDS Ficaria Seaways in 2009.
For customers who hesitate to commit to a hybrid today, but who still wish to future-proof their scrubber investment, Alfa Laval provides PureSOx systems as hybrid-ready. This option, which is Alfa Laval’s standard for open-loop deliveries, includes the connections, hardware accommodations and software flexibility needed for a later hybrid upgrade. The upgrade can be done at a shipyard quay, or in some cases while the vessel is sailing.

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