环境化学
化学
环境修复
降级(电信)
微生物降解
鞘脂单胞菌属
生物降解
污染物
生物修复
缺氧水域
土壤污染
零价铁
无氧运动
污染
微生物
有机化学
吸附
生态学
生物化学
细菌
生理学
16S核糖体RNA
基因
电信
遗传学
计算机科学
生物
作者
Lu LiangHe,Lina Sun,Chunli Yuan,Yue Han,Zhaohui Huang
出处
期刊:Chemosphere
[Elsevier]
日期:2022-11-01
卷期号:307: 135609-135609
标识
DOI:10.1016/j.chemosphere.2022.135609
摘要
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous persistent organic pollutants in soil, which have carcinogenic, teratogenic and mutagenic hazards. The effects of rhamnolipid (RL), nano zero-valent iron (nZVI), and anthraquinone-2,6-disulfonic acid (AQDS) on the degradation of PAHs in soil were studied. It was found that the treatment of 5 mg·kg-1RL + 1% nZVI +0.2 mmol·kg-1AQDS had the highest degradation rate. The degradation rate of total PAHs and HMW-PAHs was 72.81% and 79.47% respectively after 90 days. High-throughput sequencing showed that in RL + nZVI + AQDS enhanced soil, Clostridium, Geobacter, Anaeromyxobacter and Sphingomonas were the dominant species for anaerobic degradation of PAHs. Rhodococcus, Nocardioides, and Microvirga are the dominant species for aerobic degradation of PAHs. The activities of methyltransferase, dehydrogenase and catechol 1,2-dioxygenase in the anaerobic-aerobic degradation process of PAHs were consistent with the degradation process of PAHs, indicating the role of these enzymes in the degradation of PAHs. RL, nZVI, and AQDS combined enhanced microbial anaerobic-aerobic degradation has great application potential in remediation of PAHs-contaminated soil.
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