微生物胞外呼吸电子转移驱动稻田溴代物厌氧还原及矿化机制

项目名称： 微生物胞外呼吸电子转移驱动稻田溴代物厌氧还原及矿化机制

项目编号： No.21277034

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 环境科学、安全科学

项目作者： 黄德银

作者单位： 广东省生态环境与土壤研究所

项目金额： 80万元

中文摘要： 水稻土在我国南方分布广泛，但面临溴代物污染的潜在风险日益增加，多溴联苯醚、四溴双酚A等稻田土壤溴代物降解转化受到强烈关注，是目前土壤环境化学领域研究热点之一。项目以南方水稻土壤典型溴代物为目标模型物，通过微生物，将厌氧条件下溴代物降解转化的两个重要过程，即溴代物还原脱溴及脱溴产物矿化脱毒耦联进行研究，探讨微生物胞外呼吸电子转移驱动水稻土溴代物还原脱溴及矿化机制。通过模拟稻田缺氧环境，进行序批式厌氧培养实验，研究微生物在典型胞外呼吸铁呼吸、腐殖质呼吸过程中，强化溴代物还原脱溴、直至矿化脱毒的核心作用。探讨简单和复杂体系不同底物条件下，即不同土壤类型、土壤有机质含量、不同外加源措施等，对水稻土溴代物降解转化的影响机制，结合不同体系微生物群落特性及氧化还原电位变化研究，揭示水稻土体系中溴代物降解转化动力学，以及溴代物厌氧脱毒转化途径，以期为溴代物污染水稻土原位修复及可行性强化措施提供科学依据。

中文关键词： 四溴双酚A；微生物呼吸；铁还原；降解；水稻土

英文摘要： The paddy soils are widely distributed in southern provinces, but it is facing the potential pollution danger by brominated organic compounds due to the recycling activities of e-waste. The degradation of brominated flame retardants, such as PBEDs and TBBPA, have been attracted wide concern, and now it is a research focus in the field of soil environmental chemistry. In this research, typical brominated organic compound in paddy soils would be selected as model, and its two important degradation processes, i.e., reductive debromination and subsequent oxidation driven by microorganism under anaerobic conditions, would be coupled to be emphatically studied. In simulated anoxic environment of paddy soils, the key effect of microbial extracellular respiration to the degradation of brominated compounds, such as typical humus respiration and iron respiration, would be discussed through anaerobic sequencing batch culture experiments. Under different substrates in simple and complex systems, i.e., different soil types, different organic matter content and external sources, etc., the degradation processes of brominated compounds in paddy soils would be different and they would be also researched. Furthermore, the degradation kinetics of the brominated compound would be revealed by coupling the research of these internal

英文关键词： TBBPA；Microbial respiration；Iron reduction；Degradation；Paddy soils