Xu Jin-Lan, Wang Hui-Fang, Wang Rong, Zhang Qiu-Ju, Wang Jie
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Shaanxi Key Laboratory of Environmental Engineering, Xi'an 710055, China.
Huan Jing Ke Xue. 2019 Nov 8;40(11):5124-5132. doi: 10.13227/j.hjkx.201904235.
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 (CO), 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; HO concentration:225 mmol·L), 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 (C-C) 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.
为获得一种温和的芬顿预氧化方法，以促进后续生物修复中总石油烃（TPH）的高效降解，研究了不同芬顿预氧化处理后后续生物修复过程中羟基自由基（·OH）特性、养分消耗、土著细菌活性（CO）和TPH去除率的差异。结果表明，温和芬顿预氧化后（·OH存在时间：73 h；HO浓度：225 mmol·L），TPH的生物降解率较高，这是由于残留细菌的活性较高。此外，由于温和芬顿预氧化后残留细菌的活性较强，在不添加细菌的情况下也能实现与添加细菌相同的TPH去除率（TPH去除率为38%）。在不添加额外细菌源的条件下，温和芬顿预氧化的TPH去除率（约38%）高于普通芬顿预氧化后的去除率（15.32%-33.15%）。对各烃链去除效率的进一步分析表明，温和预氧化组可以减少后续生物修复阶段链烃组分（C-C）的抑制作用。比较各组土著细菌的活性，发现温和预氧化可以适当刺激土著微生物的生长并提高其活性，所有这些都有利于TPH的去除。
