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Remediation of benzo[a]pyrene contaminated soils by moderate chemical oxidation coupled with microbial degradation
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-02-03 , DOI: 10.1016/j.scitotenv.2023.161801
Bin Chen 1 , Jiang Xu 2 , Huijie Lu 3 , Lizhong Zhu 2
Affiliation  

Chemical oxidation is a promising technology for the remediation of organics-contaminated soils. However, residual oxidants and transformation products have adverse effects on microbial activities. This work aimed at moderate chemical oxidation coupled with microbial degradation (MOMD) for the removal of benzo[a]pyrene (BaP) by optimizing the type and dosage of oxidants. Potassium permanganate (KMnO4), Fe2+ + sodium persulfate (Fe2+ + PS), Fenton's reagent (Fe2+ + H2O2), and hydrogen peroxide (H2O2) were compared for BaP removal from loam clay and sandy soils. Overall, the removal efficiency of BaP by a moderate dose of oxidant coupled indigenous microorganism was slightly lower than that by a high dose of relevant oxidant. The contributions of microbial degradation to the total removal of BaP varied for different oxidants and soils. The removal efficiency of BaP from loam clay sandy soil by a moderate dose of KMnO4 (25 mmol/L) was 94.3 ± 1.1 % and 92.5 ± 1.8 %, respectively, which were both relatively higher than those under other conditions. The indirect carbon footprint yielded by the moderate dose of oxidants was 39.2–72.8 % less than that by the complete oxidation. A moderate dose of oxidants also reduced disturbances to soil pH and OC. The microbial communities after MOMD treatment were dominated by Burkholderiaceae, Enterobacteriaceae, Alicyclobacillaceae, and Oxalobacteraceae. These dominant microorganisms promoted the removal of BaP through the expression of polycyclic aromatic hydrocarbon-ring hydroxylated dioxygenase gene. Compared with complete chemical oxidation, MOMD is also a promising technique with the utilization of indigenous microorganism for remediating BaP-contaminated soils.



中文翻译:

适度化学氧化结合微生物降解修复苯并[a]芘污染土壤

化学氧化是一种很有前途的有机物污染土壤修复技术。然而,残留的氧化剂和转化产物对微生物活动有不利影响。这项工作旨在通过优化氧化剂的类型和用量,适度化学氧化结合微生物降解 (MOMD) 去除苯并 [ a ] 芘 (BaP)。高锰酸钾(KMnO 4)、Fe 2+ + 过硫酸钠(Fe 2+ + PS)、芬顿试剂(Fe 2+ + H 2 O 2)、过氧化氢(H 2 O 2) 比较了从壤土和沙土中去除 BaP 的效果。总体而言,中等剂量的氧化剂偶联土著微生物对 BaP 的去除效率略低于高剂量的相关氧化剂。微生物降解对 BaP 总去除的贡献因不同的氧化剂和土壤而异。中等剂量KMnO 4对壤质粘土砂土中BaP的去除效果(25 mmol/L) 分别为 94.3 ± 1.1 % 和 92.5 ± 1.8 %,均高于其他条件下的水平。中等剂量氧化剂产生的间接碳足迹比完全氧化产生的间接碳足迹少 39.2-72.8%。中等剂量的氧化剂也减少了对土壤 pH 值和 OC 的干扰。MOMD处理后的微生物群落以伯克霍尔德菌科肠杆菌科脂环酸杆菌科草杆菌科为主. 这些优势微生物通过多环芳烃环羟基化双加氧酶基因的表达促进了BaP的去除。与完全化学氧化相比,MOMD 也是一种利用本土微生物修复 BaP 污染土壤的有前途的技术。

更新日期:2023-02-03
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