State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
School of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK.
J Hazard Mater. 2019 Apr 15;368:444-451. doi: 10.1016/j.jhazmat.2019.01.069. Epub 2019 Jan 23.
Permeable reactive barriers (PRBs) are an environmentally-friendly, cost-effective in-situ technology that can be used to remediate polycyclic aromatic hydrocarbons (PAHs)-contaminated groundwater. In this study, PRBs of two different materials (A and B) that relied on microbes self-domestication mechanism were designed and tested. The materials A and B were the same apart from their carbon source: A was based on wheat straw and B was based on coconut shell biochar. We used laboratory batch experiments followed by long-term column tests to assess the capacity of these two materials to remediate PAHs. The results showed that both A and B removed almost 100% of the phenanthrene. More carbon was released from A (80-500 mg/L) than from B (72-195 mg/L), and slightly more oxygen was released from B (7.31-10.31 mg/L) than A (7.15-9.64 mg/L). The release of organic carbon from material B was more stable than that from material A. The bacterial communities of both columns comprised members of the Mycobacterium, Pseudomonas, and Sphingomonas genera that are known to degrade phenanthrene, and Pseudomonas and Sphingomonas were 7 times more abundant in column B than in column A. Material B is more promising for treating PAH-contaminated groundwater than material A.
可渗透反应屏障（PRB）是一种环保且具有成本效益的原位技术，可用于修复多环芳烃（PAHs）污染的地下水。本研究设计并测试了两种依赖微生物自驯化机制的不同材料（A 和 B）的 PRB。除了碳源不同外，材料 A 和 B 完全相同：A 基于麦秆，B 基于椰子壳生物炭。我们使用实验室批量实验和长期柱实验来评估这两种材料修复 PAHs 的能力。结果表明，A 和 B 几乎都能去除 100%的菲。A 释放的碳（80-500mg/L）多于 B（72-195mg/L），B 释放的氧（7.31-10.31mg/L）略多于 A（7.15-9.64mg/L）。B 材料中有机碳的释放比 A 更稳定。两列细菌群落都包含已知能降解菲的分枝杆菌属、假单胞菌属和鞘氨醇单胞菌属的成员，且假单胞菌属和鞘氨醇单胞菌属在 B 列中的丰度比 A 列高 7 倍。B 材料比 A 材料更适合处理 PAH 污染的地下水。
