摘要
为了评估表面活性剂对植物修复持久性有机污染物(POPs)的强化作用,研究了Tween 80对高羊茅修复土壤芘污染的影响效应,探讨了Tween 80对植物修复的强化机理.结果表明,实验浓度(20.24~321.42 mg/kg)范围内,Tween 80的存在促进了土壤中芘的去除,在70 d表面活性剂强化植物修复(SEPR)实验间,种植高羊茅的土壤中芘的去除率为66.52%(53.99%~80.18%),无植物土壤中芘的去除率为14.32%(11.28%~20.23%);添加4%Tween 80时,种植植物的土壤中的芘去除率为75.73%(60.96%~86.39%),无植物土壤中仅为18.43%(14.24%~25.79%).所有的芘去除途径中,植物—微生物相互作用的贡献最为显著,无论有(45.67%)、无(51.56%)Tween 80存在,都是污染物芘去除的主要手段.可见,表面活性剂Tween 80的存在强化了高羊茅对芘污染土壤的修复效果,SEPR技术是改善植物修复POPs修复效果的有效途径.
In order to evaluate the reinforcement effects of surfactants on phytoremediation with persistent organic pollutants( POPs),the paper studies the efficacy of Tween 80 on the soil photoremediation with Festucaarundinacea and discusses the strengthening mechanisms of Tween 80 on the soil photoremediation. Results show that the presence of Tween 80 enhances the dissipation of pyrene at initial contents ranging from 20. 24 to 321. 42 mg/kg. During the 70 d SEPR-experiments,about 66. 52%( 53. 99% ~ 80. 18%) of pyrene is removed from soil with Festucaarundinacea,and only 14. 32%( 11. 28% ~ 20. 23%) degradation of pyrene occurs in soil without Festucaarundinacea. With the presence of 4% Tween 80,the dissipation ratios of pyrene in soil with Festucaarundinacea,increase up to 75. 73%( 60. 96% ~ 86. 39%) while the dissipation ratios of pyrene in soil without Festucaarundinacea are as low as 18. 43%( 14. 24% ~ 25. 79%). Among all possible methods,plant-microbial interactions plays the most important role in the dissipation of pyrene,either with the presence( 45. 67%) or the absence( 51. 56%) of Tween 80,which are all the primary means for removing contaminants pyrene. It's clear to see that the existence of surfactant Tween 80 reinforces the remediation effects of Festucaarundinaceaon soil polluted by pyrene and SEPR technology could serve as the most effective way to improve the remediation effects of Phytoremediation with persistent organic pollutants( POPs).
引文
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