不同堆存时长粉煤灰的氮磷吸附动力学研究

采集高皇贮灰场内不同堆存时长的湿排粉煤灰样品,通过室内化学分析研究了不同粉煤灰氮磷吸附动力学的各自特征,以期为粉煤灰土地复垦提供一定的科学依据与参考。结果表明:粉煤灰对氮磷的吸附以物理吸附为主,基本符合一级动力学方程;粉煤灰对氮的吸附主要发生在实验开始后1 h内,对磷的吸附主要发生在实验开始后10 h内;表层与下层灰样的饱和吸附量与粉煤灰粒径之间存在一定相关性,而与堆存时间相关性较小。在利用粉煤灰复垦土地时,粉煤灰的粒径将对重构土壤氮磷吸附的能力存在一定影响,进而影响其复垦效果。

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．