黑麦草对城市排污河沉积物中重金属污染的修复

摘要

[目的]采用种植黑麦草的方式对城市排污河沉积物重金属污染进行修复.[方法]通过栽培试验的方法,从去除效果、最佳去除时间、蔗糖酶和脲酶活性的变化以及微生物数量的变化等方面,研究了黑麦草对河道底泥重金属污染的修复作用.[结果]在种植黑麦草3个月后,底泥中Ni含量基本稳定,Cr、Mn达到最佳去除效果,其中Cr的去除率达到最大值(57.1％)；在种植黑麦草4～5个月后,蔗糖酶和脲酶的活性分别提高到原来的4.59和10.34倍:在种植黑麦草3～4个月后,细菌数、真菌数均提高至原来的2-3倍.可见,种植黑麦草对受污染河道底泥中重金属的去除、酶活性的提高以及微生物数量的增长具有明显作用,黑麦草的种植时问以4个月左右为宜.[结论]该研究为河道沉积物污染的治理提供了理论依据.%[Objective ] The aim was to restore heavy metal pollution of urban sewage river sediment by using iolium perenne. [ Method ] Through cultivation test, the phytoremediation of heavy metal pollution in river sludge by L perenne was analyzed from the aspects of removal effect,optimal removal time and the changes of sucrase activity, urease activity and microbe quantity. [ Result] After planting L perenne for three months,the content of Ni in sludge was stable,while the removal effect of Cr and Mn in sludge was optimal,and the removal rate of Cr reached the maximum value (57. 1% ). After 4 -5 months,sucrase and urease activity were 4. 59 and 10. 34 times the previous activity,respectively. In addition, the quantity of bacteria and fungi was 2 -3 times the previous quantity after3 -4 months. In a word ,L. Perenne had obvious effects on the removing of heavy metal,improvement of enzyme activity and microbe quantity in polluted river sludge,and the optimal planting time of L. Perenne was four months. [ Conclusion] The study could provide theoretical foundation for the control of polluted sediment in river.