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.
Environ Pollut. 2024 Apr 1;346:123591. doi: 10.1016/j.envpol.2024.123591. Epub 2024 Feb 15.
This study developed an efficient and stable landfill leachate treatment process, which was based on the combination of biochar catalytic ozonation and activated sludge technology for intensive treatment of landfill leachate, aiming to achieve the standard discharge of leachate. The focus is to investigate the effect of manganese loading on the physicochemical properties of biochar and the mechanism of its catalytic ozonation. It was found that more surface functional groups (CO, Mn-O, etc.) and defects (I/I = 1.27) were exposed via the change of original carbon structure by loading Mn, which is conducive to the generation of lattice oxygen. Meanwhile, generating different valence states of Mn metal can improve the redox properties and electron migration rate, and encourage the production of reactive oxygen species (ROS) during the reaction process and enhance the catalytic efficiency. The synergistic action of microorganisms, especially denitrifying bacteria, was found to play a key role in the degradation of nitrogenous pollutants during the activated sludge process. The concentration of NH-N was reduced from the initial 1087.03 ± 9.56 mg/L to 9.05 ± 1.91 mg/L, while COD was reduced from 2290 ± 14.14 mg/L to 86.5 ± 2.12 mg/L, with corresponding removal rates of 99.17% and 99.20%, respectively. This method offers high efficiency and stability, achieving discharge standards for leachate (GB16889-2008). The synergy between Mn-loaded biochar and microorganisms in the activated sludge is key to effective treatment. This study offers a new approach to solving the challenge of waste leachate treatment.
本研究开发了一种高效稳定的垃圾渗滤液处理工艺，该工艺基于生物炭催化臭氧化和活性污泥技术的结合，对垃圾渗滤液进行强化处理，旨在达到渗滤液的标准排放。本研究的重点是考察锰负载对生物炭的物理化学性质的影响及其催化臭氧化的机理。结果发现，通过改变原始碳结构，负载 Mn 后可以暴露更多的表面官能团（CO、Mn-O 等）和缺陷（I/I=1.27），有利于晶格氧的生成。同时，生成不同价态的 Mn 金属可以提高氧化还原性能和电子迁移率，促进反应过程中活性氧物质（ROS）的产生，增强催化效率。在活性污泥过程中，微生物（特别是反硝化菌）的协同作用被发现对含氮污染物的降解起着关键作用。NH-N 的浓度从初始的 1087.03±9.56mg/L 降低到 9.05±1.91mg/L，而 COD 从 2290±14.14mg/L 降低到 86.5±2.12mg/L，相应的去除率分别为 99.17%和 99.20%。该方法效率高且稳定，达到了渗滤液（GB16889-2008）的排放标准。负载 Mn 的生物炭与活性污泥中的微生物之间的协同作用是有效处理的关键。本研究为解决垃圾渗滤液处理难题提供了新的途径。
