To increase contact surface between sewage sludge and fly ash, and to improve heavy metals and contaminants adsorption, several fly ash conditioning trials have been planned.

<p> According to its later use as construction material, selection criteria of materials and techniques have been the lowest possible cost, and compatibility with components of cement manufacturing.</p> <p> The most suitable materials were selected, and optimization of their processing conditions was carried out.</p> <p> &nbsp;</p> <p> &nbsp;</p> <p style="text-align: center;"> <img alt="" src="https://www.ctaex.com/icirbus/ficheros/imagenes/2018_01/17-07-acondicionamiento-cenizas3.jpg" style="width: 500px; height: 281px;" /></p>