State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
J Hazard Mater. 2020 Dec 5;400:123313. doi: 10.1016/j.jhazmat.2020.123313. Epub 2020 Jun 25.
Particulate organic matter (POM) includes humin and non-degradable residues, and the knowledge about its composition, evolution and environmental behavior is limited. The composition, evolution and its influence on dechlorination of the POM in landfill was studied. The results show that POM accounts for 27 %-57 % of the organic matter in landfill cell, which is mainly composed of protein-, fulvic- and humic-like components. Firmicutes and Proteobacteria were the main microorganisms driving the compositional evolution of POM during the landfilling process. The electron acceptance capacities (EAC) and electron donating capacities (EDC) of POM were in the range of 0.05-0.51 μmol/gC and 0.13-0.66 μmol/gC, respectively, and the average EAC and EDC of POM in the intermediate and old stage of landfill were higher than those in the initial stage. The combined action of MR-1 and POM increased the degradation rate of PCP by 20 %-40 %, which was ascribed to the reduction capacities and electron transfer process of POM. POM derived from the intermediate and old stages promoted PCP dechlorination more effectively when compared with the initial stage due to its high electron transfer capacities (ETC), which are of great significance for soil in-situ bioremediation.
颗粒态有机物质（POM）包括腐殖质和不可降解残留物，其组成、演化及其环境行为的相关知识还很有限。本研究考察了垃圾填埋场中 POM 的组成、演化及其对脱氯的影响。结果表明，POM 占垃圾填埋单元中有机物质的 27%-57%，主要由蛋白质、富里酸和腐殖酸样组分组成。在填埋过程中，厚壁菌门和变形菌门是驱动 POM 组成演化的主要微生物。POM 的电子接受能力（EAC）和电子供体能力（EDC）分别在 0.05-0.51 μmol/gC 和 0.13-0.66 μmol/gC 范围内，填埋中、后期 POM 的平均 EAC 和 EDC 高于初始阶段。MR-1 和 POM 的联合作用将五氯苯酚的降解速率提高了 20%-40%，这归因于 POM 的还原能力和电子传递过程。与初始阶段相比，中、后期 POM 对五氯苯酚的脱氯促进作用更强，因为其具有较高的电子传递能力（ETC），这对于土壤原位生物修复具有重要意义。
