In September of 2018, biosolids and organics solutions provider, Lystek International, announced that it had successfully commissioned another installation of its low temperature Thermal Hydrolysis Process (Lystek THP®) at the City of St. Cloud, Minnesota, as part of the city’s nutrient recovery and reuse project. The model project was partially funded through a point source implementation Grant made possible by the Minnesota Clean Water Legacy Act.
The Cambridge, Ontario company has released a case study about this project, providing details regarding the drivers behind the development and execution of this sector leading project, including the role Lystek was invited to play in this initiative.
The Lystek system is helping the city dramatically reduce volumes, solve pressing storage challenges, and save millions of dollars in infrastructure and operational costs. The solution also facilitates the recovery of valuable organic matter and nutrients from the city’s wastewater biosolids to create LysteGro® a high value, Class A quality biofertilizer product that is available to the local, agricultural market.
St. Cloud is located in the Mississippi Delta river region and is the largest population center in the state’s central area. The Delta river region is negatively affected by eutrophication due to run-off of nitrogen and phosphorus. The Minnesota Clean Water Legacy Act is an ambitious plan that includes the provision of funding to local organizations for on-the-ground work to protect and restore lakes, rivers, and streams, in order to meet state water quality standards.
St. Cloud’s new recovery facility (nutrient, energy, and water) serves a population of over 120,000 from the city and surrounding communities of St. Augusta, St. Joseph, Sartell, Sauk Rapids, and Waite Park. The plant has a design flow of 17.9 MGD and features a Biological Nutrient Removal system to help eliminate nutrient overloading into the local waterways.
Recycled wastewater contains valuable nutrients and organic matter that keeps soil healthy. Healthy plants and soils are also able to retain more moisture, thereby reducing the risk of run-off and eutrophication which causes algae to grow, destroying aquatic life and resulting in poor water quality. In order to maximize nutrient use by agricultural plant life, while minimizing the potential for run-off (and odors), the LysteGro biofertilizer product is subsurface injected directly into the soil during application.
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