Start-up targets onboard open loop washwater trial


Prime Lake's washwater processing module uses redox technology to neutralise organic impurities. (Image: Prime Lake)Prime Lake’s washwater processing module uses redox technology to neutralise organic impurities. (Image: Prime Lake)



A Swedish start-up has successfully completed a land-based pilot test of its Electro-Aeration redox solution on open loop scrubber washwater.

The test results showed the process reduced the Polycyclic Aromatic Hydrocarbons (PAHs) in the washwater (by 95%). The treated washwater also displayed improved turbidity and pH-levels. The results demonstrated that Uppsala-based Prime Lake’s solution was effective at treating open loop scrubber washwater.

The start up’s Electro-Aeration method oxidises scrubber washwater. The solution has a small footprint (of under 8m2). As a redox solution, the reactor does not require chemicals, while the reverse electrolysis method (using high ampere, low voltage energy) also minimises operating costs. The company estimated energy consumption at 3,700W/m3 of processed washwater during the trial, which used washwater from a 400-passenger ro-pax.

The next steps are to work with the ship owner to perform a trial aboard a vessel, initially on a reduced flow basis before reaching full flow of circa 240m3/hr. During the calibration of the reactor system, Prime Lake plans to work closely with a classification society with the intention of obtaining certification.

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