植物在大型环境实验舱中对苯系物的净化

Purification of BTX by ornamental plants in a large environmental chamber

通过环境实验舱模拟居室环境实际状况,考察作者以往研究中采用熏蒸箱筛选出的、能较好净化苯系物的植物品种在真实环境下的实际净化效果.实验舱内苯、甲苯、二甲苯的初始浓度分别设置为10,8.5,2.7 mg/m3,并设空舱熏蒸对照.采用不同数量、长势均一的健康圆叶竹芋"青苹果"(Calathea rotundifolia cv.Fasciata)熏蒸.熏蒸8 h的实验结果显示,4盆植物的净化效果与空舱熏蒸无显著差异;8盆植物的净化效果好于4盆,且对二甲苯的净化效果尤为显著.熏蒸3 h后,放置8盆植物的实验舱内二甲苯的浓度较对照熏蒸舱的降低约50%.实验表明,即便室内苯系物浓度较高时,采用熏蒸箱系统筛选出的植物品种通过适当增加植物摆放量,在模拟环境中仍能发挥有效净化功能.研究中使用的环境实验舱因其性能稳定、条件可控等特性,有待成为室内空气植物净化技术较为理想的应用测试平台.

This research establishes a testing platform for the phytoremediation of indoor air pollution in a large environmental chamber. Initial concentrations of benzene,toluene and xylene(BTX) were set at 10,8.5 and 2.7 mg/m3respectively,with fumigation in a blank chamber used as a control. After 8 h of fumigation,there were no significant differences in the air purification between four pots of plant(Calathea rotundifolia cv). Fasciata and the control. When eight pots of C. rotundifolia cv. Fasciata were fumigated,the BTX purification effects increased and especially xylene was significantly removed. The purification effects were enhanced when the biomass of the ornamental plants was increased. A large environmental chamber can be used as a testing platform for the application of phytoremediation of indoor air pollution,as shown by its stable performance.