Amendments and bioaugmentation enhanced phytoremediation and micro-ecology for PAHs and heavy metals co-contaminated soils
Amendments and bioaugmentation enhanced phytoremediation and micro-ecology for PAHs and heavy metals co-contaminated soils
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DOI：
10.1016/j.jhazmat.2021.128096
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发表时间：
2021-12-21
影响因子：
13.6
通讯作者：
Cui, Zhaojie
中科院分区：
文献类型：
--
作者：
Cao, Xiufeng;Cui, Xiaowei;Cui, Zhaojie
多环芳烃（PAHs）与多种金属的共存对大规模污染场地的净化提出了挑战。本研究旨在综合评价强化植物修复技术在复合污染土壤中的修复潜力。结果表明，多环芳烃和重金属的去除是时间依赖性，污染相关性，植物特异性。紫花苜蓿对16种多环芳烃的去除效果(37.3%）显著高于龙葵。(20.7%）。S. nigrum L. Cd的去除率高于Zn和Pb，而M. sativa L.吸收更多的Zn。改良剂和微生物菌剂的加入显著提高了污染物的植物修复效率，缩短了植物间的差距。90 d后，两种植物对Cd和PAHs的去除率分别达到80%和90%。强化植物修复后，土壤重金属的稳定性得到提高。通过改变植物的抗氧化防御系统（超氧化物歧化酶、过氧化物酶、过氧化氢酶），减轻了植物的脂质过氧化作用。土壤酶活性，包括脱氢酶，脲酶，过氧化氢酶增加了5倍。土壤细菌多样性和结构发生了变化，主要由变形菌门、放线菌门、Patescibacteria、拟杆菌门和厚壁菌门组成。这些研究结果提供了一个绿色和可持续的方法来净化复杂污染的环境，综合改善土壤健康。
Co-existence of polycyclic aromatic hydrocarbons (PAHs) and multi-metals challenges the decontamination of large-scale contaminated sites. This study aims to comprehensively evaluate the remediation potential of intensified phytoremediation in coping with complex co-contaminated soils. Results showed that the removal of PAHs and heavy metals is time-dependent, pollution-relevant, and plant-specific. Removal of sixteen PAHs by Medicago sativa L. (37.3%) was significantly higher than that of Solanum nigrum L. (20.7%) after 30 days. S. nigrum L. removed higher amounts of Cd than Zn and Pb, while M. sativa L. uptake more Zn. Nevertheless, amendments and microbial agents significantly increased the phytoremediation efficiency of pollutants and shortened the gap between plants. Cd removal and PAHs dissipation reached up to 80% and 90% after 90 days for both plants. Heavy metal stability in soil was promoted after the intensified phytoremediation. Plant lipid peroxidation was alleviated, regulated by changed antioxidant defense systems (superoxide dismutase, peroxidase, catalase). Soil enzyme activities including dehydrogenase, urease, and catalase increased up to 5-fold. Soil bacterial diversity and structure were changed, being largely composed of Proteobacteria, Actinobacteria, Patescibacteria, Bacteroidetes, and Firmicutes. These findings provide a green and sustainable approach to decontaminating complex-polluted environments with comprehensive improvement of soil health.