Landfills still represent the main option for waste disposal in many parts of the world. Anyway, they often pose a significant pollution risk and contribute to potential environmental and human health impacts via gaseous and liquid (leachate) emission pathways if not properly managed. Some innovative technologies can help to reduce these emissions, such as in situ aeration and the application of microbial electrochemical technologies (METs). METs are an emerging field that open the possibility to control microbial reactions, enhancing electron flows from electron donors towards electron acceptors. To this end, several materials with different electrochemically-active properties are used, such as electrical conductivity, capacitance, surface electroactivity and charge. The present project named LA-LA-LAND (Landfill electron-Lapping for a LANDscape requalification) was aimed to apply METs to treat leachate-saturated zones in old landfills. A MET prototype was constructed using a granular anode (graphite) and a cylindrical air-cathode (electroactive biochar). The METs were integrated to three identical laboratory-scale landfill bioreactors coupled with the in situ aeration technique, while three control reactors run without MET. The maximum values of current and power density obtained were 0.015 A·m⁻² and 0.00035 W·m⁻². The influence of the MET system on the organic matter removal was evident in two reactors, where this technology was applied, with respect to the control ones: total organic carbon decreased on average 13%, while it reduced less than 5% in the control reactors. This preliminary experiment pointed out some critical aspects of MET configuration, such as the weakness of the cathode architecture, which was prone to be flooded by leachate, blocking the aeration flux.

在世界许多地方，垃圾填埋场仍然是废物处理的主要选择。无论如何，如果管理不当，它们通常会造成重大的污染风险，并通过气体和液体（渗滤液）排放途径对潜在的环境和人类健康造成影响。一些创新技术可以帮助减少这些排放，例如原位曝气和微生物电化学技术 (MET) 的应用。MET是一个新兴领域，它开启了控制微生物反应的可能性，增强了从电子供体到电子受体的电子流动。为此，使用了几种具有不同电化学活性特性的材料，例如电导率、电容、表面电活性和电荷。目前的项目名为 LA-LA-LAND (La ndfill electron- La pping for a LAND scape requalification）旨在应用 MET 处理旧垃圾填埋场的渗滤液饱和区。使用粒状阳极（石墨）和圆柱形空气阴极（电活性生物炭）构建了 MET 原型。MET 被集成到三个相同的实验室规模的垃圾填埋场生物反应器以及原位曝气技术，而三个控制反应器在没有 MET 的情况下运行。获得的电流和功率密度的最大值为0.015 A·m ^-2和0.00035 W·m ^-2. MET 系统对有机物去除的影响在两个应用该技术的反应器中很明显，相对于对照反应器：总有机碳平均减少 13%，而在对照反应器中减少不到 5% . 这个初步实验指出了 MET 配置的一些关键方面，例如阴极结构的弱点，它容易被渗滤液淹没，阻塞曝气通量。