What is the technology behind a scrubber treatment unit?

A scrubber water treatment unit can remove polycyclic aromatic hydrocarbons (PAH), particulate matter (PM), and other unwanted particles. This process benefits the environment by fighting ocean acidification.

A closed-loop scrubber requires a marine scrubber water treatment system to treat the bleed flow from the scrubber’s process tank. Here, you can learn more about the differences between open-loop scrubbers, closed-loop scrubbers, and hybrid scrubbers.

Based on more than 20 years of experience in the filtration industry, our scrubber wastewater treatment’s core element is our unique, patented ceramic membrane technology. Our ceramic membranes are made of the durable and long-lasting material silicon carbide, the second hardest material in the world, only surpassed by diamonds. It is the hardest man-made material ever made. Learn more about the unique material silicon carbide here. Our ceramic membranes operate within the ultrafiltration range, can handle up to 800°C, have an unmatched flux, and are chemically resistant, which means they can withstand alkaline and acidic waters.

Additionally, a significant benefit of utilizing membranes is that these generate a much lower amount of effluent than what is typically delivered by a closed-loop scrubber. Up to 95% of the feed that enters the WTU ends up as permeate. Learn more about our unique silicon carbide filtration membranes here.

The LiqTech wastewater treatment unit has a housing of either 99 or 137 tubular ceramic membranes arranged in a crossflow filtration configuration for scrubber wash water treatment. The configuration method is highly applicable for challenging applications with a high fouling tendency, such as scrubber wash water. Learn more about crossflow filtration here. 

As the membranes operate, soot and particles will eventually accumulate on the surface and cause membrane fouling. Fouling is frequently removed as the crossflow works as a rising mechanism, which rinses the membrane surface with feedwater. This process increases the time interval that a filtration unit can be operational without further cleaning. When additional cleaning is necessary, backwash is performed. Still, for the ceramic membranes to operate efficiently and maintain a stable capacity with high sludge production, they require periodic cleaning to remove soot and particles from all surfaces. This is done with a chemical cleaning-in-place (CIP). The frequency of backwash and CIP depends on the operating conditions of the vessel’s engine. The cleaning processes can occur either automatically or semi-automatically, ensuring low manual maintenance and easy operation. Learn more about how ceramic membranes are cleaned here.