Characterization and categorization of the ashes

The results of the characterization of the ashes (i.e., chemical composition, physical and chemical properties) are presented. The ashes will be categorized into groups with critical characteristics (e.g., chemical composition/undesired elements and reactivity) taken as criteria. The groups will be rated into different levels. Lower level of a certain group of ashes means more efforts of pre-treatment will be needed before utilization.