【目的】为应对黄土高原及类似环境敏感地区的土壤磷污染,开发粉煤灰回用技术。【方法】通过批处理实验,将粉煤灰作为改良剂,系统研究投加量、pH、初始磷浓度、时间和温度对不同比例粉煤灰改良的红黏土吸附磷的影响。【结果】吸附等温模型、动力学模型及热力学分析结果表明,粉煤灰的添加显著提高了红黏土对磷吸附的最大容量,加快了红黏土磷吸附反应速率并改变了吸附动力学机理,提高了吸附过程的自发性。该研究为解决黄土高原红黏土磷污染与粉煤灰可持续处置问题提供了新思路。

【Purposes】 This work has been done to deal with soil phosphorus pollution in the  Loess Plateau area and similar environmentally sensitive regions and develop a technique for reusing  coal fly ash. 【Methods】 Batch studies with coal fly ash as a soil amendment were conducted to sys‐ tematically investigate the impact of dosage, pH, initial phosphorus concentration, time, and tempera‐ ture on phosphorus adsorption in red clay soils with amendment of coal fly ash. 【Findings】 Isother‐ mal, kinetic, and thermodynamic analyses indicated that the addition of coal fly ash significantly en‐ hanced the maximum adsorption capacity of red clay soils for phosphorus, accelerated the adsorption  reaction rate, altered the phosphorus adsorption kinetics, and enhanced the spontaneity of the adsorp‐ tion process. This study provides new insights into addressing phosphorus pollution in red clay soils in  the Loess Plateau area and the sustainable disposal of coal fly ash.