En la línea sólida se reconvirtieron los decantadores existentes en decantadores lamelares y se ha construido un espesador de fangos con el objetivo de disminuir el volumen de fangos a deshidratar, mejorando el rendimiento de esta etapa. ACCIONA ha sido responsable del suministro e instalación de los nuevos equipos electromecánicos, de la instrumentación, de los cuadros de automación y de su programación y de la puesta en marcha de los nuevos órganos. Obras de ampliación y beneficios El Estudio Preliminar recomendaba un conjunto de obras de ampliación y mejora, orientadas fundamentalmente no solo a solucionar el problema del déficit en la etapa de decantación existente, sino también a incrementar la capacidad de las instalaciones de tratamiento de las aguas recuperadas - decantadores de lodos y agua de lavado de filtros. difficulties in removing turbidity and aluminium from the filters, for flow rates of above 0.6 m3/s. What did the extension consist of? What was the scope of the work carried out by Acciona? The extension works covered both the water line and the sludge line. Two new flotation lines were built in the water line in order to increase the flow rate of the DWTP and reduce the quantity of solids sent to filtration, thus increasing overall plant performance. In the sludge line, the existing settling tanks were converted into lamellar clarifiers and a sludge thickener was built to reduce the volume of sludge to be dewatered, thereby improving the performance of this stage. ACCIONA was responsible for the supply and installation of the new electromechanical equipment, instrumentation, automation panels and programming, as well as the commissioning of the new elements. Extension works and benefits The Preliminary Study recommended a number of extension and upgrading actions, not only aimed at solving the problem of the deficit in the existing settling stage, but also at increasing the capacity of the wastewater treatment facilities - sludge and filter cleaning water settling tanks. With respect to increasing the capacity of the clarification stage, “High Rate Clarification Technologies”were studied, taking account of the following main conditions: www.futurenviro.es | Junio-Julio June-July 2021 55
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