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Desde la Red Española de Compostaje se observa con interés el creciente acercamiento de la sociedad a la gestión sostenible de los residuos orgánicos, así como a la aparición y paulatina implantación de tecnologías que permiten transformar los residuos en recursos, con la obtención de valor añadido a nivel energético, fertilizante, medioambiental. Por ello, hemos desarrollado un proyecto editorial denominado DE RESIDUO A RECURSO, EL CAMINO HACIA LA SOSTENIBILIDAD que desde la Ciencia y aprovechando nuestra formación didáctica y de divulgación integra todo el conocimiento científico-técnico necesario para poder comprender y participar a nivel experto de la gestión de los residuos, a través del conocimiento de su naturaleza, sus potenciales alternativas de tratamiento así como ejemplos avanzados de gestión sostenible. El presente volumen trata con profundidad todos los aspectos relacionados con las técnicas de separación, recogida selectiva o en masa, transporte y tratamiento de los residuos sólidos urbanos, sin olvidar un aspecto clave como es el económico. Se incluyen aspectos ligados a los posibles tratamientos biológicos que se pueden utilizar, ya sean de tipo aerobio o anaerobio, y sus implicaciones ambientales. Se incluye una completa recopilación de legislación existente y se tratan algunos casos prácticos, entre los que destacan los lodos de depuración de aguas residuales urbanas, como residuo de generación creciente y con aspectos diferenciales y similares con respecto a los residuos sólidos urbanos.