Grellier Solenne, Robain Henri, Bellier Gérard, Skhiri Nathalie
Creed, Veolia Environment, 291 Avenue Dreyfus Ducas, 78520 Limay, France.
J Hazard Mater. 2006 Sep 1;137(1):612-7. doi: 10.1016/j.jhazmat.2006.02.049. Epub 2006 Apr 5.
A bioreactor landfill is designed to manage municipal solid waste, through accelerated waste biodegradation, and stabilisation of the process by means of the controlled addition of liquid, i.e. leachate recirculation. The measurement of electrical resistivity by Electrical Resistivity Tomography (ERT) allows to monitor water content present in the bioreactors. Variations in electrical resistivity are linked to variations in moisture content and temperature. In order to overcome this ambiguity, two laboratory experiments were carried out to establish a relationship between temperature and electrical conductivity: the first set of measurements was made for leachate alone, whereas the second set was made with two different granular media saturated with leachate. Both experiments confirm a well known increase in conductivity of about 2% degrees C(-1). However, higher suspended matter concentrations lead to a lower dependence of electrical conductivity on temperature. Furthermore, for various porous media saturated with an identical leachate, the higher the specific surface of the granular matrix, the lower the effective bulk electrical conductivity. These observations show that a correct understanding of the electrical properties of liquids requires the nature and (in particular) the size of the electrical charge carriers to be taken into account.
生物反应堆填埋场旨在通过加速废物生物降解以及通过控制添加液体（即渗滤液再循环）来稳定该过程，从而管理城市固体废物。通过电阻层析成像（ERT）测量电阻率可以监测生物反应堆中存在的水分含量。电阻率的变化与水分含量和温度的变化相关。为了克服这种模糊性，进行了两项实验室实验以建立温度与电导率之间的关系：第一组测量仅针对渗滤液进行，而第二组测量是针对用渗滤液饱和的两种不同颗粒介质进行的。两项实验均证实电导率随温度升高约2%/°C这一众所周知的现象。然而，较高的悬浮物浓度会导致电导率对温度的依赖性降低。此外，对于用相同渗滤液饱和的各种多孔介质，颗粒基质的比表面积越高，有效体积电导率越低。这些观察结果表明，要正确理解液体的电学性质，需要考虑电荷载流子的性质（特别是）大小。
