School of Environment, Tsinghua University, Beijing, 100084, China; Department of Environmental Science, Karakoram International University, Gilgit, Pakistan.
School of Environment, Tsinghua University, Beijing, 100084, China.
Chemosphere. 2022 Sep;303(Pt 3):135255. doi: 10.1016/j.chemosphere.2022.135255. Epub 2022 Jun 7.
Due to increasing industrialization, soils are increasingly contaminated by polycyclic aromatics such as pyrene and need gentle treatment to keep the soil functioning. This study applied a double dielectric barrier discharge (DDBD) plasma reactor and composting reactor to remediate pyrene-contaminated soil. The effect of peak-to-peak applied voltages on the remediation efficiency of pyrene was investigated. The experimental results illustrate that pyrene remediation efficiency increased from 43% to 85% when the peak-to-peak applied voltage was increased from 28.0 to 35.8 kV. When using the combined method of DDBD and composting, 90-99% of pyrene could be removed, while a reduction of 76.5% was achieved using only composting, indicating the superiority of the combined system. Moreover, the authors could demonstrate that DDBD plasma treatment improves humification in the post-composting process as humic acid (HA) concentrations increased to 7.7 mg/g with an applied voltage of 35.8 kV; when composting was used as the sole treatment method, only 3.4 mg/g HA were produced. The microbial activity in the DDBD plasma-treated soil peaked on the 5th day and had a 2nd rise afterwards. The authors demonstrate that the combined technology of DDBD plasma and composting is a promising method for soil remediation with persistent organic pollutants. This treatment approach improves pollutant degradation efficiency and facilitates further humification, potentially restoring the function of contaminated soil. This approach could be considered a cost-effective and green strategy for soil remediation with persistent organic pollutants.
由于工业化的不断发展，土壤中多环芳烃（如芘）的污染越来越严重，需要进行温和处理以保持土壤的功能。本研究应用双介质阻挡放电（DDBD）等离子体反应器和堆肥反应器来修复芘污染土壤。研究了峰-峰施加电压对芘修复效率的影响。实验结果表明，当峰-峰施加电压从 28.0kV 增加到 35.8kV 时，芘的修复效率从 43%提高到 85%。当采用 DDBD 和堆肥联合方法时，90-99%的芘可以被去除，而仅采用堆肥时，去除率为 76.5%，表明联合系统具有优越性。此外，作者能够证明 DDBD 等离子体处理可以改善堆肥后的腐殖化过程，因为在施加电压为 35.8kV 时，腐殖酸（HA）浓度增加到 7.7mg/g；而当仅采用堆肥作为单一处理方法时，仅产生 3.4mg/gHA。DDBD 等离子体处理土壤中的微生物活性在第 5 天达到峰值，随后再次上升。作者证明，DDBD 等离子体与堆肥联合技术是一种很有前途的处理持久性有机污染物污染土壤的方法。这种处理方法提高了污染物的降解效率，并促进了进一步的腐殖化，可能恢复了污染土壤的功能。这种方法可以被认为是处理持久性有机污染物污染土壤的一种具有成本效益和绿色的策略。
