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首页> 外文期刊>Separation and Purification Technology >Removal of benzo[a]pyrene from soil in a novel permeable electroactive well system: Optimal integration of filtration, adsorption and bioelectrochemical degradation
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Removal of benzo[a]pyrene from soil in a novel permeable electroactive well system: Optimal integration of filtration, adsorption and bioelectrochemical degradation

机译：从一种新型透水电活性井系统中除去土壤中的苯并[a]芘：过滤，吸附和生物电化学降解的最佳整合

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摘要

A novel closed-circuit permeable electroactive well (CPEW) was constructed to remove benzo[a]pyrene (BaP) from soil. BaP was removed sequentially through interception, adsorption and further biodegradation on a graphite felt, which acted as a filtration layer and also a bioanode. The removal efficiency of absolute BaP amount in CPEW was 52.52 +/- 4.23%, higher than 44.94 +/- 2.69% in the control (open-circuit PEW, OPEW). Physical adsorption and biodegradation accounted for 66.31 +/- 4.15% and 33.51 +/- 1.58% of BaP removed from soil in CPEW, and 86.26 +/- 5.21% and 13.57 +/- 1.29% in OPEW at 50 d. Bioelectrochemical process greatly enhanced the biodegradation efficiency of absolute BaP amount from 6.13 +/- 0.49% (OPEW) to 17.63 +/- 1.49% (CPEW). High abundances of Gammaproteobacteria and Clostridia on the anode of CPEW could significantly enhance electrons transfer and thus improve BaP biodegradation. Moreover, Vibrionaceae (belonged to class Gammaproteobacteria) possibly played an important role in electron transfer. Based on the function predication analysis, the bioelectrochemical process could enhance the BaP biodegradation through increasing metabolic rates instead of changing metabolic pathways. Conclusively, CPEW, efficiently integrating filtration, adsorption and bioelectrochemical degradation, is a promising easy-to-implement in situ remediation technology for soil, sediment or groundwater contaminated with refractory organics.
机译：构建了一种新型闭合渗透电活性井（CPEW）以从土壤中除去苯并[a]芘（BAP）。通过拦截，吸附和进一步生物降解在石墨毡上依次去除烤盘，其用作过滤层和生物潮。 CPEW中的绝对凸藻含量的去除效率为52.52 +/- 4.23％，在控制中高于44.94 +/- 2.69％（开路电路PEW，OPEW）。物理吸附和生物降解占66.31 +/- 4.15％和33.51 +/- 1.58％从CPEW中取出的土壤中取出，86.26 +/- 5.21％和13.57 +/- 1.29％在50天。生物电化学过程极大地提高了6.13 +/- 0.49％（Opew）至17.63 +/- 1.49％（CPEW）的绝对烘烤量的生物降解效率。 CPEW阳极上的高度丰富的γ曲线杀菌和梭菌可显着增强电子转移，从而提高BAP生物降解。此外，vibrionaceae（属于类伽血杆菌）可能在电子转移中发挥了重要作用。基于功能预测分析，生物电化学过程可以通过增加代谢速率而不是改变代谢途径来增强BAP生物降解。结论，CPEW，有效地整合过滤，吸附和生物电化学降解，是对难治有机体污染的土壤，沉积物或地下水的原位修复技术易于实施。

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