不同改良剂对污灌区镉砷和多环芳烃复合污染土壤的修复研究

Remediation of Different Soil Amendments on Soil Combined Pollution with Cadmium, Arsenic and PAHs in A Sewage Irrigation Area

为了探讨不同改良剂对污灌区复合污染土壤的修复效果,以春玉米为材料,研究7种改良剂的添加对春玉米籽粒及土壤中镉(Cd)、砷(As)和多环芳烃(∑PAHs)含量的影响。结果表明:经过硫磺和酵素菌处理的土壤,玉米籽粒Cd、As含量显著增加(P<0.05),∑PAHs含量增加效果不显著;经过生石灰、钠质膨润土、腐植酸和硅藻土处理的土壤,玉米籽粒Cd、As显著降低(P<0.05),∑PAHs含量降低效果不显著;而CXEM菌剂的添加对玉米籽粒As、Cd含量的抑制不显著,但对∑PAHs含量抑制效果明显(P<0.05)。不同改良剂对土壤中Cd、As含量普遍影响不大,但在CXEM菌剂作用下,土壤∑PAHs含量与对照相比,降低了17.8%(P<0.05)。因此,不同改良剂对玉米籽粒及土壤中Cd、As、∑PAHs含量的影响,主要与土壤改良剂本身的性质有关。

To explore the remediation effects of different soil amendments on soil combined pollution in a sewage irrigation area, the spring maize and 7 soil amendments were used to conduct the field experiments. In this study, the Cd, As and PAHs contents in the seeds of maize and soil were measured. The results presented that： the Cd, As and PAHs contents in the seeds of maize increased in the sulphur and enzyme microorganism treated soil; the Cd and As contents increased significantly comparing with the control group （P〈0.05）. 3 pollutant contents in the seeds of maize decreased in the lime, sodium bentonite, humic acid and diatomite treated soil; the Cd and As contents decreased significantly comparing wit.h the control group （P〈0.05）. The Cd, As and PAHs contents in the seeds of maize decreased in the CXEM microbial agent treated soil; the PAHs contents decreased significantly comparing with the control group （P〈0.05）. The Cd, As and PAHs contents in soil treated were less influenced by the addition of soil amendments. However, the PAHs contents decreased 17.8% obviously （P〈0.05）. Therefore, the influences of soil amendments on Cd, As and PAHs contents in the seeds of maize and soil were mainly related with the characterization of soil amendment.