| 温和预氧化提高后续生物修复石油污染土壤 |
| 摘要点击 1255 全文点击 536 投稿时间：2019-04-25 修订日期：2019-06-22 |
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| 中文关键词 温和Fenton预氧化 羟基自由基 生物修复 链烃 石油污染土壤 |
| 英文关键词 mild Fenton pre-oxidation hydroxyl radical bioremediation chain hydrocarbons crude oil-contaminated soil |
| 作者 | 单位 | E-mail | | 徐金兰 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | xujinlan@xauat.edu.cn | | 王慧芳 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 王荣 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 章秋菊 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | | | 王杰 | 西安建筑科技大学环境与市政工程学院, 西安 710055
陕西省环境工程重点实验室, 西安 710055 | |
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| 中文摘要 |
| 为得到一种能促进后期生物阶段高效降解石油烃（TPH）的温和Fenton预氧化方式，本文考察了不同Fenton预氧化过程中羟基自由基（·OH）特征、后续生物修复过程中营养消耗、土著菌活性（CO2）以及TPH去除量的差异，结果表明，温和Fenton预氧化组（·OH存在时间：73 h；双氧水浓度：225 mmol·L-1）中·OH存在时间短H2O2用量少，残余细菌活性高，后续对石油的生物降解率高，不加菌就能够达到与加菌相同的修复效果（TPH去除率38%左右）.且在不加菌的条件下，后期生物阶段TPH去除率，温和预氧化组（38%）要高于普通预氧化组（15.32%~33.15%）.进一步分析各链烃的去除效果，发现在后续生物修复阶段，温和预氧化组能减少对链烃组分（C17~C21）的抑制；而对比各组的土著菌活性，发现温和预氧化可以适当刺激土著微生物生长并提高其活性，这些因素均有利于TPH的去除.温和预氧化在后期生物修复阶段对TPH的去除不加菌就能够达到与加菌相同的处理效果，是一种低成本可行的修复方式. |
| 英文摘要 |
| To obtain a mild Fenton pre-oxidation method, which could promote the efficient degradation of total petroleum hydrocarbons (TPH) in subsequent bioremediation, the differences in the characteristics of the hydroxyl radical (·OH), nutrient consumption, activity of indigenous bacteria (CO2), and TPH removal were investigated during subsequent bioremediation after different Fenton pre-oxidation treatments. The results showed that high biodegradation of TPH was observed after mild Fenton pre-oxidation (·OH existence time:73 h; H2O2 concentration:225 mmol·L-1), because of the high activity of residual bacteria. Moreover, the same TPH removal with the addition of bacteria could be achieved without adding bacteria (the TPH removal rate 38%) because the activity of the residual bacteria was strong after mild Fenton pre-oxidation. Under the condition of no additional bacteria source, mild Fenton pre-oxidation TPH removal (approximately 38%) was higher than that after ordinary Fenton pre-oxidation (15.32%-33.15%). Further analysis of the removal efficiency of each chain of hydrocarbons revealed that the mild pre-oxidation group could reduce the inhibition of the chain hydrocarbon components (C17-C21) in the subsequent bioremediation stage. Comparing the activity of the indigenous bacteria in each group, revealed that mild pre-oxidation could appropriately stimulate the growth and increase the activity of indigenous microorganisms, all of which are beneficial to the removal of TPH. |
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