化学氧化增强苯并[a]芘的微生物降解。
Enhanced microbial degradation of benzo[a]pyrene by chemical oxidation.
机构信息
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, 310058, China.
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou, Zhejiang, 310058, China.
出版信息
Sci Total Environ. 2019 Feb 25;653:1293-1300. doi: 10.1016/j.scitotenv.2018.10.444. Epub 2018 Nov 3.
Chemical oxidation and microbial degradation are promising treatments to remediate soils contaminated with persistent organic pollutants. Moderate pre-oxidation is able to enhance the subsequent bioremediation of organic pollutants in soil. In this study, the effects of pre-oxidation on the subsequent biodegradation of benzo[a]pyrene (BaP) were evaluated. The tested oxidants included potassium permanganate (PP) and iron-activated sodium persulfate (PS) at the concentration of 1-40 mmol L. The results showed that 20 mmol L PS and 10 mmol L PP treatments had the highest degradation efficiency of BaP in soil, up to 98.7% and 84.2%, without inhibiting subsequent microbial degradation. 10-20 mmol L of the two oxidants significantly promoted viability of microbial community. Especially, PS facilitated the occurrence of more PAHs-degrading microorganisms. The expression of PAH-degradation gene in PS treatment was significantly higher than that in PP treatment (P < 0.05), leading to 12.0-18.4% higher degradation efficiencies of BaP. In general, proper oxidants of moderate dosages were able to promote microbial bioremediation of persistent organic pollutants in soil.
化学氧化和微生物降解是修复受持久性有机污染物污染土壤的有前途的处理方法。适度的预氧化能够增强土壤中有机污染物的后续生物修复。本研究评价了预氧化对苯并[a]芘（BaP）后续生物降解的影响。测试的氧化剂包括浓度为 1-40 mmol/L 的高锰酸钾（PP）和铁激活的过硫酸钠（PS）。结果表明，20 mmol/L PS 和 10 mmol/L PP 处理对土壤中 BaP 的降解效率最高，分别达到 98.7%和 84.2%，而不会抑制随后的微生物降解。两种氧化剂的 10-20 mmol/L 浓度显著促进了微生物群落的活力。特别是 PS 促进了更多多环芳烃降解微生物的出现。PS 处理中 PAH 降解基因的表达明显高于 PP 处理（P < 0.05），导致 BaP 的降解效率提高了 12.0-18.4%。总的来说，适量的适当氧化剂能够促进土壤中持久性有机污染物的微生物生物修复。
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