RECALCITRANCE INDEX FOR ORGANIC MATTER IN THE CAPPING OF GRANULATED COAL ASH ON RIVERBANK TIDAL FLAT

Abstract

 A granulated coal ash (GCA) eluting ions such as Ca²⁺, SiO₂, OH⁻ were covered on riverbank tidal flats. In this study, polymerization process of organic matter owing to GCA was verified. Sediment properties were investigated for 27 months after GCA capping. An increase in pH caused increase in coarse particles and decrease in fine particles. The granulation process was due to ions eluted from GCA, which caused the binding of fine particles and complex reaction of organic matter. The granulation of organic matter corresponded to the recalcitrance property, indicating that the amount of coarse particles can be used as an indicator of the recalcitrance of organic matter. The polymerization process was also found in the lower part of the GCA capping layer.