对二氯苯污染土壤的植物修复研究

Phytoremediation of PDCB contaminated soil

采用种植物的方法,对以对二氯苯(PDCB)为代表的多氯代有机污染物(PCOPs)污染土壤的植物修复进行了研究。以黑麦草、紫花苜蓿和大蒜作为供试植物,在PDCB为1856μg/kg的污染土壤中种植90d,研究了不同植物条件下土壤中PDCB的降解情况。结果表明,与空白对照相比,种植物大大提高了土壤中微生物的数量和酶的活性。试验结束后,种植黑麦草、紫花苜蓿和大蒜后,PDCB分别降低82.44%、62.82%和59.59%。种植黑麦草时PDCB降解最快,对PDCB污染土壤修复的效果最好。

Remedy on-dichlorobenzene （PDCB） contaminated soil was studied by the method of phytoremediation. Three plants （ryegrass, alfalfa and garlic） were selected and planted in PDCB contaminated soil for three months. The PDCB concentrations, number of microorganisms, soil enzyme activity in the contaminated soil were characterized during the phytoremediation process. The results showed that planting ryegrass,alfalfa and garlic could reduce the content of PDCB in soil, the concentrations of PDCB were reduced 82.44% ,62.82% and 59.59%, respectively. Soil microbial counts and enzyme activity were also increased in the phytoremediation process. Ryegrass had higher capacity of dissipation PDCB than alfalfa and garlic. The field study results demonstrated that phytoremeiation was a possible and environmentally friendly technology for remediation PDCB contaminated soils.