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Anti-struvite coating: optimising and making wastewater processing more sustainable

Thomas  Poulsen

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Anti-struvite coating: optimising and making wastewater processing more sustainable

Utilising the latest coating technology on process equipment can make wastewater processing more effective, sustainable and cost-effective.

To avoid damaging the water, soil and ground water environments, an enormous amount of wastewater from households and industry is treated at waste water facilities before discharge each day. Within wastewater treatment the occurrence of struvite on process equipment, such as pumps, is a recurring problem. By applying an anti-struvite coating to the equipment, struvite sediments can be reduced considerably or eliminated completely, thus extending the operational time between service of the process equipment.

In industrial water treatment processes, the occurrence of struvite sediments is a well-known issue. Today, increased environmental focus demands more careful wastewater treatment, which creates a larger need for cleaning and maintaining sensors, valves and pumps where struvite fouling often occurs.

Read more: Sol-Gel surface technology

DTI has developed a coating that effectively hinders struvite and other materials from settling on process equipment. The coating also reduces the further build-up and adhesion of struvite that has already settled on the equipment. This means that cleaning the equipment only requires water and no chemicals or mechanical cleaning, and intervals between cleaning are greatly reduced when employing the coating.

- We apply the struvite-repellent coating in our pilot production plant with a spray gun and subsequently oven cure the product. The thickness of the coating is only 5-10 micrometers and it can be applied to several types of metals, such as aluminum, titanium, stainless and carbon steel, says Thomas Poulsen, Senior Specialist at DTI.  

Normal operation of equipment requires cleaning every 14 days, while with the coating the operational time can be extended to one year. The minimized amount of struvite and the simpler, cheaper and less labor-intensive cleaning process means that the process equipment will need to be serviced less than before, thus optimising the performance of the entire facility.