Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process, Shenyang, 110016, China.
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; National-Local Joint Engineering Laboratory of Contaminated Soil Remediation by Bio-physicochemical Synergistic Process, Shenyang, 110016, China.
Chemosphere. 2020 Apr;244:125467. doi: 10.1016/j.chemosphere.2019.125467. Epub 2019 Nov 27.
This study presents a systematic pilot-scale study on removal of PAHs from the abandoned site of Shenyang former Coking Plant in China (total PAH concentration of 5635.60 mg kg in soil). Three treatments, including the control treatment (without inoculation and electric field), bioremediation (with inoculation), and the electro-bioremediation (with inoculation and electric field), were conducted with a treatment time of 182 days to assess their PAH-removal efficiency. All the treatments were conducted from May to October under natural conditions. Results show that electro-bioremediation enhanced the removal of total PAHs, especially high-ring (>3 rings) PAHs. At 182 days, the degradation extents of total and 4-6-ring PAHs reached 69.1% and 65.9%, respectively, under electro-bioremediation (29.3% and 44.4% higher, respectively, than those under bioremediation alone). After electro-bioremediation, the total toxicity equivalent concentrations of total PAHs and 4-, 5- and 6-ring PAHs reduced 49.0%, 63.7%, 48.2% and 30.1%, respectively. These results indicate that electro-bioremediation not only effectively removed the PAHs but also reduced the health risks of soil in an abandoned coking plant site. In addition, electro-bioremediation with polarity reversal could maintain uniform soil pH, the degradation extent of PAHs and soil microorganism numbers at all sites. The environmental conditions, such as temperature and rainfall, had little influence on the process of electro-bioremediation. These findings suggest that electro-bioremediation may be applied for field-scale remediation of heavily PAH-contaminated soil in abandoned coking plant sites.
本研究在中国沈阳前焦化厂废弃场地（土壤中总多环芳烃浓度为 5635.60mg/kg）进行了系统的中试规模研究，以去除多环芳烃。共进行了 3 种处理，包括对照处理（不接种和无电场）、生物修复（接种）和电生物修复（接种和电场），处理时间为 182 天，以评估其多环芳烃去除效率。所有处理均在自然条件下于 5 月至 10 月进行。结果表明，电生物修复增强了总多环芳烃的去除，特别是高环（>3 环）多环芳烃。在 182 天时，电生物修复下总多环芳烃和 4-6 环多环芳烃的降解程度分别达到 69.1%和 65.9%，分别比单独生物修复高 29.3%和 44.4%。电生物修复后，总多环芳烃和 4-、5-和 6-环多环芳烃的总毒性当量浓度分别降低了 49.0%、63.7%、48.2%和 30.1%。这些结果表明，电生物修复不仅有效地去除了多环芳烃，而且降低了废弃焦化厂场地土壤的健康风险。此外，具有极性反转的电生物修复可以在所有场地保持均匀的土壤 pH 值、多环芳烃的降解程度和土壤微生物数量。环境条件，如温度和降雨量，对电生物修复过程的影响很小。这些发现表明，电生物修复可能适用于废弃焦化厂场地中重度多环芳烃污染土壤的现场规模修复。
