<p style="text-align: justify;"> Two new Compost Microbiologically Controlled (CMC) piles have been design with different percentages of clean sewage sludge from Action B5 trial, with heavy metals and organic contaminants content reduced.</p> <p style="text-align: justify;"> &nbsp;</p> <p style="text-align: justify;"> Composting process has suffered from incidents during its evolution, due to unforeseen rains and low temperatures. Finally, anaerobic degradation moved forward and two composts were obtained; they will be used as fertilizers in Action B7 trials of Field validation, concretely in corn crop.&nbsp;</p> <div> &nbsp;</div> <div style="text-align: right;"> <img alt="" src="https://www.ctaex.com/icirbus/ficheros/imagenes/2018_05/18-02-elaboracion-fertilizantes-por-compostaje.jpg" style="width: 724px; height: 185px;" /></div>