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Effect of Bacillus subtilis and NTA-APG on pyrene dissipation in phytoremediation of nickel co-contaminated wetlands by Scirpus triqueter
Ecotoxicology and Environmental Safety ( IF 6.8 ) Pub Date : 2018-02-22 , DOI: 10.1016/j.ecoenv.2018.02.028
Xiaoyan Liu , Xiaoxin Hu , Xinying Zhang , Xueping Chen , Jing Chen , Xiaoyu Yuan

A complex mix of organic pollutants and heavy metal made the remediation of contaminated wetlands more difficult. Few research focus on the remediation for pyrene enhanced by chemical reagents and pyrene degrading bacteria in the nickel co-contaminated soil. In this paper, the effect of chemical reagents (nitrilotriacetic acid and alkyl polyglucoside) and Bacillus subtilis on pyrene dissipation in phytoremediation of nickel co-contaminated soil by Scirpus triqueter was investigated. Similar seedlings of Scirpus triqueter were moved to uncontaminated soil and pyrene-nickel co-contaminated soil. The pots (14.8 cm diameter and 8.8 cm height) were set up in greenhouse and treated in different ways. After 60 days, plant biomass, radial oxygen loss (ROL), soil dehydrogenase activity (DHA) and pyrene concentration in soil were determined. Results showed that ROL rate and DHA in different groups was positively correlated with pyrene dissipation from soil. In the process of remediation, chemical reagents might have an indirect slight effect on pyrene dissipation (pyrene dissipation increased 21%) by affecting DHA firstly and redistributing pyrene fractions in the presence of pyrene degrading bacteria. Pyrene degrading bacteria were likely to affect pyrene dissipation by impacting ROL rate and DHA and played a more vital role in contributing to pyrene dissipation (pyrene dissipation increased 45%) from wetland. This study demonstrated that phytoremediation for pyrene in nickel co-contaminated soil by Scirpus triqueter can be enhanced by the application of NTA-APG and pyrene degrading bacteria and they could be reasonably restore the ecological environment of PAH-contaminated wetlands.



中文翻译:

的影响枯草芽孢杆菌通过与NTA-APG芘耗散镍共同污染的湿地植物修复藨草

有机污染物和重金属的复杂混合使污染湿地的修复更加困难。很少有研究集中在通过化学试剂和and降解细菌在镍共同污染的土壤中增强pyr的修复上。本文研究了化学试剂(亚硝酸三乙酸和烷基多葡糖苷)和枯草芽孢杆菌Scirpus triqueter修复镍污染的土壤中pyr的耗散Scirpus triqueter的类似幼苗被转移到未污染的土壤和pyr镍共同污染的土壤。将盆(直径14.8厘米,高8.8厘米)放在温室中,并用不同的方法处理。60天后,测定植物生物量,径向氧损失(ROL),土壤脱氢酶活性(DHA)和土壤中的concentration浓度。结果表明,不同组的ROL率和DHA与pyr从土壤中的消散呈正相关。在修复过程中,化学试剂可能会首先通过影响DHA并在存在grad降解细菌的情况下重新分配pyr馏分,从而对dissipation的耗散产生间接的轻微影响(increased耗散增加21%)。yr降解细菌可能通过影响ROL速率和DHA来影响pyr的消散,并且在导致to从湿地消散(py消散增加了45%)中起着更重要的作用。这项研究表明,用镍对土壤中的pyr进行了植物修复。施用NTA-APG和pyr降解细菌可以增强Scirpus triqueter,并且可以合理地恢复被PAH污染的湿地的生态环境。

更新日期:2018-02-22
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