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Dow Water successfully tests UF modules

Results confirm the technology provides quality feedwater to reverse osmosis system downstream.

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Zakia Bahjou
Zakia Bahjou

Dow Water & Process Solutions has announced the results of a recent successful pilot testing of DOW™ Ultrafiltration technologies at its Global Water Technology Center in Tarragona, Spain.

The pilot program aimed to monitor the quality of the feedwater produced by the DOW Ultrafiltration system, with the data used to validate and qualify new products before their launch into the market.

The results of the pilot confirm sustainable and stable operation of DOW Ultrafiltration commercial modules as a pre-treatment for the Reverse Osmosis system downstream for more than 300 accumulated days, demonstrating their robustness in a real wastewater reuse application with relatively high organic content.

Veronica Garcia, EMEA technical service and development manager, Dow Water & Process Solutions, said: “This type of pilot experiment does not usually last more than few weeks, and therefore the long duration of the DOW Ultrafiltration piloting emphasizes the company’s long-term commitment to product development and continued research.”

In order to provide real wastewater conditions, the pilot system was fed with secondary effluent from the Vilaseca (Tarragona-Spain) municipal wastewater treatment plant.

Typically, due to wastewater feed quality and characteristics, the Reverse Osmosis system cannot be fed directly from the secondary effluent of the wastewater treatment plant without interruption.

Therefore, to guarantee the required feed quality to the Reverse Osmosis system, a DOW Ultrafiltration SFP-2880 system was integrated upstream.

The autopsies carried out on the Ultrafiltration modules following the end of the piloting demonstrated the absence of broken or damaged fibers, as well as no reported loss in tensile strength and mechanical properties.

The permeate produced by the system downstream is suitable for a number of applications, such as for irrigation purposes, either for golf courses or for agriculture.

Another important finding from the study is the associated cost reduction resulting from the combination of DOW Ultrafiltration and DOW FILMTEC™ Reverse Osmosis technologies.

For instance, DOW Ultrafiltration systems require a lower footprint when compared to other methods of conventional pre-treatment technologies, such as sand filtration.

In addition, less chemical cleanings are required in the DOW FILMTEC Reverse Osmosis system downstream due to the more suitable feed water provided by the DOW Ultrafiltration system, resulting in longer membrane life, higher plant availability and lower replacement rate of cartridge filters.

Zakia Bahjou, ME, Africa & Turkey Regional Commercial Manager, Dow Water & Process Solutions, said: “We are committed to investing in research and development to ensure the highest quality and efficiency of our products, not only in Spain and Europe, but also in the Middle East and across the globe.”

DOW Ultrafiltration modules stand out for their hydrophilic PVDF hollow fibers, which feature high strength, chemical resistance and low-fouling tendency, as well as their optimized flow configuration (OUT-IN) for high tolerance to a wide variety of feed water types, minimizing the risk of fiber plugging.

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