Mechanism on emulsified vegetable oil stimulating nitrobenzene degradation coupled with dissimilatory iron reduction in aquifer media
Mechanism on emulsified vegetable oil stimulating nitrobenzene degradation coupled with dissimilatory iron reduction in aquifer media
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含水层介质中乳化植物油刺激硝基苯降解与异化铁还原的机制
DOI：
10.1016/j.biortech.2018.03.084
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发表时间：
2018
影响因子：
11.4
通讯作者：
Dong Jun
中科院分区：
文献类型：
--
作者：
Chi Zifang;Lei Jiansen;Ding Linjie;Dong Jun
微生物异化铁还原可以修复地下水中的可还原性污染物，如硝基苯（NB）。但含水层的自然衰减率是有限的。为了刺激这一过程，乳化植物油（EVO）注入作为修复剂。对该过程的机理进行了研究。结果表明，EVO的加入使铁更容易被微生物利用，从而促进异化铁还原。易于使用的Fe（III）作为电子受体并被还原为Fe（II）。Fe（II）为NB提供电子，NB被还原为苯胺。含水层介质中的硫化物也提供电子并氧化成多硫化物，然后与Fe（II）形成沉淀物到含水层介质表面，从而减缓EVO的电子供应，形成NB修复的永久效率。该工作有助于对EVO刺激下NB的修复过程有一个系统的认识。
Microbial dissimilatory iron reduction could remediate reducible pollutants in groundwater, such as nitrobenzene (NB). But the natural attenuation rate in aquifer is limited. To stimulate this process, emulsified vegetable oil (EVO) was injected as a remediation agent. The mechanism of this process was studied. Results showed that the addition of EVO made iron easier used by microorganisms and thus promoted dissimilatory iron reduction. The readily used Fe(III) served as electron acceptor and was reduced to Fe(II). Fe(II) supplied electrons to NB, with NB reduced to aniline. Sulphide in the aquifer media also donated electrons and oxidized to polysulfide, then forming precipitates with Fe(II) to the surface of aquifer media, and thus slowing down the electron supplying of EVO and forming permanent efficiency for NB remediation. The work helps to complete a systematic understanding of NB remediation process under stimulation of EVO.