Solex collaborates with Andritz on bisolids cooling solution

Two new units to handle 8,100 pounds/hour of pellets at Kentucky wastewater plant

Solex Thermal Science is excited to announce a new equipment collaboration with Andritz Group, this time in the safe handling of biosolid pellets at the Louisville Wastewater Treatment Plant in Kentucky.  

As part of the agreement, Solex will deliver two of its patented indirect heat exchangers to the U.S.-based facility where it will cool an estimated 8,100 pounds/hour of the nutrient-rich, organic materials that result from the treatment of sewage. The biosolids are then most commonly used as fertilizer and soil amendment.

The new units are in addition to four existing 7,400-pound/hour coolers provided by Solex that have been successfully in operation at the treatment plant since 2000.

Andritz Louisville

To accommodate faster transport times, Solex specially designed the two coolers to process 25 cubic feet (875 pounds) of pellets every 90 seconds, yet also reduce the amount of required cooling water. Solex cools biosolids indirectly via conductivity whereby the particles flow uniformly between hollow stainless-steel pillow plates while cooling water circulates counter-currently within those plates.

The cooling phase is considered an essential part of stabilizing biosolids, thereby preventing decomposition and possible smoldering or auto ignition during transport or storage.

Solex provided a custom-designed discharge to accommodate the maximum batches needed for the pneumatic conveying system in the plant.

Both units are expected to be delivered to the Kentucky facility before the end of 2020.

This most recent collaboration between Solex and Andritz comes after an announcement earlier this year that the two organizations are partnering on a 13,500 pounds/hour biosolids cooling solution at the Village Creek Wastewater Treatment Plan in Fort Worth, Texas.

Solex Thermal Science is the global market leader and developer of high-efficiency, indirect heat exchangers for bulk solids heating, cooling and drying. Over the past 30 years, the Canadian-headquartered company has installed more than 600 advanced heat exchangers in more than 50 countries worldwide with applications such as fertilizer, oilseeds, sugar and industrial materials.

Andritz Group is a globally leading supplier of plants, equipment, and services for hydropower stations, the pulp and paper industry, the metalworking and steel industries, and for solid/liquid separation in the municipal and industrial sectors as well as for animal feed and biomass pelleting.


This entry was posted in Biosolids and tagged Cooling and last updated on October 20, 2020


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