STUDY ON NITROGEN AND PHOSPHORUS ADSORPTION KINETICS OF FLY ASH WITH DIFFERENT DUMPING TIME

Wet fly ash samples with different dumping time were collected from the ash field in Gaohuang and their nitrogen and phosphorus adsorption kinetics were researched by laboratory tests，which could provide reference for the fly ash reclamation． Results showed that adsorption process was mainly physical and approximately conformed to the first-order kinetic model． The nitrogen adsorption process mainly occurred in the first 1 hour and the phosphorus adsorption process occurred mainly in the first 10 hours． The saturated adsorption amount of fly ash was related to its particle size at some level，while less relevant to its depositing time． When using fly ash to reclaim land，there existed certain relationship between fly ash particle size and nitrogen /phosphorus adsorption of reconstructed soil and further influence the reclamation effect．