污泥中几种重金属元素在砂土中的运移

Mobility of Heavy Metals in a Sandy Soil Amended with Sewage Sludge

通过土柱实验，研究了污泥中几种重金属元素Cu，Zn，Ni，Ph的运移特点和形态。实验表明，表层4cm土壤混入6％的污泥后，显著增加了Cu，Ni，Zn的淋出量．而Ph没有显著增加。淋出液中Cu，Ni几乎都是配位态重金属，Zn则有较高比例的非配位态离子。土壤对Cu2+的吸附能力大于Zn2+，Cu2+与有机物的配位能力强于Zn2+。水溶性有机物与重金属的配位反应对Cu，Ni运移影响较大。Zn的运动则主要受土壤的吸附作用和配位反应的影响。

A soil column experiment and an incubation experiment were conducted to study the mobility and forms of Cu,Ni,Zn,Pb in sludge-soil system. The results indicated that Cu,Ni,Zn in elution increased significantly when 1. 5g sewage sludge was mixed with the top 4cm soil (6% sewage sludge in the top 4cm soil). Pb didn't increase. Nearly all the Cu and Ni in the elution were in complexion forms. Zn had higher proportion of non-complexion forms. The soil absorption capacity to Cu is higher than that to Zn, and Cu-binding capacity with organic matter is higher than that of Zn. The complexion capacities of Cu and Ni with water-soluble organic matter are important factors to influence theis mobility. For Zn, the soil absorption capacity affects Zn mobility much.