The degradation of MSW in landfills occurs naturally from the beginning of the disposal, during landfill operation and even after its closure, over a period of several years. The monitoring of closed landfills can be quite costly when done only by direct methods, especially in areas where technical and financial resources are restricted. This work presents a case study in the extreme south of Brazil that represents the vast majority of landfills in the country: public landfills, in small ditches with little resources. The geophysical survey sought to identify leachate accumulation zones and verify their chemical stability in relation to the geological environment from the joint analysis of the electrical resistivity and self-potential data. Data acquisition took place on the same date (02/2018), with results that reveal leachate generation areas (−60 mV and ~ 30 Ωm), leachate accumulation (−40 mV and ~ 20 Ωm) and areas with a predominance of inert waste (> 40 mV), where previously existing organic matter was practically degraded. The combined use of geoelectric methods to understand the degradation dynamics of organic matter in landfills allows for the recognition of active zones of leachate generation, information that supports chemical stabilization projects and site remediation.

垃圾填埋场中的城市固体废弃物从处置开始，在填埋场操作期间甚至关闭后自然会持续数年之久。仅通过直接方法进行封闭的垃圾填埋场的监控可能会非常昂贵，尤其是在技术和财务资源有限的地区。这项工作提供了一个在巴西最南端的案例研究，代表了巴西的绝大多数垃圾填埋场：公共垃圾填埋场，小沟渠，资源匮乏。地球物理调查试图从电阻率和自电位数据的联合分析中找出渗滤液的聚集区，并验证其相对于地质环境的化学稳定性。数据采集​​发生在同一日期（02/2018），结果显示渗滤液产生区域（−60 mV和〜30Ωm），渗滤液积累（−40 mV和〜20Ωm）以及主要是惰性废物（> 40 mV）的区域，以前存在的有机物实际上被降解了。地电方法的结合使用可了解垃圾填埋场中有机物的降解动力学，从而可以识别渗滤液产生的活跃区域，支持化学稳定项目和现场修复的信息。