高有机质含量垃圾的含水量监测试验研究——利用表面处理的TDR探头  

Experimental study on monitoring moisture content in municipal solid wastes with high organic content: using coated TDR probe

作　　者：徐辉[1] 詹良通[1] 穆青翼[1] 王顺玉[1] 陈云敏[1] 

机构地区：[1]浙江大学,软弱土与环境土工教育部重点实验室,浙江杭州310027

出　　处：《中国环境科学》2014年第8期2030-2039,共10页China Environmental Science

基　　金：国家"973"项目(2012CB719802)

摘　　要：为了研究时域反射技术(TDR)对高电导率、高有机质含量的填埋垃圾的适用性,设计并制作了探针表面镀环氧树脂基复合材料和套PVC管的TDR探头,测试并评估了各个探头测试介质含水量的电导率适用范围和感应区域范围,同时推荐了95%探针长度套PVC热缩管的探头作为最优选择.对所选探头进行标定后,安装在填埋自制新鲜垃圾和现场老垃圾的模型单元中,测试渗滤液入渗过程中和入渗后的含水量变化,结果表明:经表面处理后的TDR探头能够有效测试高有机质含量填埋垃圾的含水量,且能够对瞬态渗流过程引起的含水量变化迅速响应;当渗流达到稳定时,TDR测试的含水量结果与水量平衡分析结果较为接近,绝对误差在5%以内.The aims of this experimental study were to evaluate the applicability of coated TDR probes in highly conductive MSWs with high organic content. TDR probes with identical geometry but different kinds of coating, i.e, coating with an epoxy-resin composite and PVC tube, were produced. The effect of the coating treatment on the dielectric permittivity measurement and the influence area of the TDR probes were evaluated. Based on the evaluation, the probe with a PVC coating on the 95% of the rod length was recommended for the application in MSWs. The recommended TDR probe was calibrated and installed in two laboratory cells, i.e., one containing fresh MSWs and the other containing decomposed MSWs. The change of moisture content in the wastes was measured during and after leachate infiltration into the cells. The measurements demonstrated that the recommended coated TDR probe was effective in measuring the moisture content in the MSWs with a high organic content and was able to capture the hydraulic response of MSWs with transient seepage. The measurement of moisture content at the steady state condition was close to the result that calculated from water balance analysis, and the maximum difference was less than 5%.

关 键 词：时域反射技术(TDR) 含水量 城市生活垃圾 高有机质含量 渗流 

分 类 号：X705[环境科学与工程—环境工程] TU411[建筑科学—岩土工程]