Estudio de caso: Ellsworth, WI
The West Central Wisconsin Biosolids Facility (WCWBF) is a regional biosolids processing facility in Ellsworth, Wisconsin, serving Ellsworth and over 20 neighboring communities. The biosolids are dewatered by centrifuges to 20-24% total solids. The dewatered sludge enters an alkaline stabilization system that mixes the sludge with lime and fly ash to yield a Clase A producto. Los biosólidos tratados se almacenan en un edificio de almacenamiento cubierto de 37,000 pies cuadrados y los agricultores locales los reutilizan de manera beneficiosa semestralmente.
En 2008, WCWBF decidió actualizar el proceso de estabilización de la cal, con los principales objetivos de contener los costos y mantener la calidad del aire y el control de olores. El mezclador existente utilizó tolvas abiertas; entre eso y las cenizas volantes, el sistema generó mucho polvo. Además, la instalación recibió quejas periódicas de los vecinos sobre el olor.
WCWBF chose a Schwing Bioset system employing a closed hopper, screw conveyors, and pressurized piping system to contain dust and odors. To avoid costly contract hauling charges, WCWBF had to achieve demolition of the old system and installation of the new Schwing Bioset system within 10 days of shutting down the old system. Demolition and preparation took three days; Schwing Bioset’s team installed the new equipment, including the electrical, within the remaining seven days.
With a few minor modifications to adapt it to the winter weather, the Schwing Bioset system has performed within expectations since commissioning, achieving its goals of managing cost, dust, and odors.
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