Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Membrane Separation of Shaanxi Province, Xi'an University of Architecture and Technology, Xi'an 710055, China.
J Hazard Mater. 2023 Oct 5;459:132118. doi: 10.1016/j.jhazmat.2023.132118. Epub 2023 Jul 21.
In this study, biochar was produced based on dehydrated excess sludge from the municipal wastewater treatment plant, which was used for catalytic ozonation of pollutants derived from landfill leachate. The necessary catalytic sites in the structure of biochar were originated from the inorganic metals and organic matters in the sludge, which included a large number of functional groups (e.g., C-C, CO, etc.), adsorbed oxygen (O accounted for 44.82%) and electron defects (I/I=1.01). These active sites could promote the generation of reactive oxygen species (ROS) (e.g., ·OH,·O, etc.). The synergistic interaction between the microorganisms in the activated sludge also facilitated the removal rates of pollutants. Proteobacteria, Bacteroidetes, and Deinococcu-Thermus were crucial in the bioreactor. In 16 days of reaction, the removal ratios of NH-N and COD were 98.95 ± 0.11% and 90.89 ± 0.47%, respectively. This study not only explains the mechanism of catalytic ozonation of biochar, but also provides a new way of the practical treatment of landfill leachate.
在这项研究中，基于市政污水处理厂的脱水剩余污泥生产生物炭，用于催化臭氧化来自垃圾渗滤液的污染物。生物炭结构中的必要催化位点来源于污泥中的无机金属和有机物，其中包含大量的功能基团（例如 C-C、CO 等）、吸附氧（O 占 44.82%）和电子缺陷（I/I=1.01）。这些活性位点可以促进活性氧物种（ROS）的生成（例如·OH、·O 等）。 活性污泥中的微生物之间的协同相互作用也促进了污染物的去除率。变形菌门、拟杆菌门和厚壁菌门-热球菌门在生物反应器中至关重要。在 16 天的反应中，NH-N 和 COD 的去除率分别为 98.95±0.11%和 90.89±0.47%。本研究不仅解释了生物炭催化臭氧化的机制，还为垃圾渗滤液的实际处理提供了一种新方法。
