金属还原菌和零价铁对多溴联苯醚的协同降解机理研究

项目名称： 金属还原菌和零价铁对多溴联苯醚的协同降解机理研究

项目编号： No.21207019

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 环境化学

项目作者： 陈杏娟

作者单位： 广东省微生物研究所

项目金额： 25万元

中文摘要： 水环境沉积物中持久性有机污染物多溴联苯醚的污染及危害日益凸现。零价铁有利于多溴联苯醚还原脱溴，但表面极性氢气膜和铁矿物的钝化会阻止零价铁继续氧化。微生物是还原矿化多溴联苯醚的关键力量，但多溴联苯醚的强疏水性和化学稳定性导致还原效率低。前期研究发现，较强疏水性的金属还原菌和化学性质活泼的零价铁在多溴联苯醚的协同降解中具有优势互补作用，可能是实现多溴联苯醚污染治理的有效途径。项目综合电子传递、胞外成分结构、代谢产物和表面疏水性四个方面，重点研究金属还原菌消耗零价铁氧化产生的氢气偶联还原多溴联苯醚而生长以及减慢零价铁表面铁矿物钝化的作用；零价铁产生相对不稳定的低溴代同系物被金属还原菌利用以及提高金属还原菌细胞表面疏水性而促进多溴联苯醚降解转化的作用。预期阐明金属还原菌和零价铁协同降解多溴联苯醚的新机理，揭示这种协同降解作用的本质，为水环境沉积物中持久性有机污染物的污染控制和治理提供新的理论指导。

中文关键词： 十溴联苯醚；金属还原菌；零价铁；协同作用；解钝化

英文摘要： Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants and have increasingly attracted international attention because of their potential to impact the environment and human health. Zero-valent iron is capable of debrominating PBDEs into lower brominated congeners, but a polarizing hydrogen film and corrosion products is formed at the metal surface that protects zero-valent iron from further oxidation. Biodegradation is considered to be a promising way of removing PBDEs from the environment. However, microbiological degradation of PBDEs is a significant challenge owing to their hydrophobicity and chemical stability. It is found previously that the relatively hydrophobic metal-reducing bacteria and electron-active zero-valent iron have complementary advantages in PBDEs degradation, which will study in this project. This research involves scientific content about cell growth and hydrogen consumption of metal-reducing bacterium in relation to anoxic zero-valent iron corrosion coupled to deca-BDE degradation; impact of metal-reducing bacterium on the precipitation of corrosion products on the surface of zero-valent iron; production of relatively unstable and lower bromo congener of deca-BDE by zero-valent iron for metal-reducing bacterium; impact of zero-valent iron on the change in surface hydroph

英文关键词： Deca-brominated diphenyl ether；Metal-reducing bacteria；Zero-valent iron；Synergistic degradation；ZVI depassivation