基于FFT的垃圾填埋场低频交流检测法的研究  

Research of Low-Frequency AC Method for Landfill Leakage Detection Based on FFT

作　　者：李鹤群[1] 刘景财[2] 党楠[1,2] 能昌信[2] 

机构地区：[1]中国矿业大学(北京),北京100083 [2]中国环境科学研究院固体废物污染控制技术研究所,北京100012

出　　处：《环境科学与技术》2015年第1期68-71,105,共5页Environmental Science & Technology

基　　金：国家高技术研究发展规划"863"项目(2007AA061303)

摘　　要：为了解决填埋场高压直流检测法稳定性较差、精确度较低的问题,文章提出了基于FFT（fast Fourier transformation,离散傅氏变换的快速算法）的低频交流电信号填埋场渗漏检测方案,可以提高垃圾填埋场实时检测系统的检测精度,大大减少由电压不稳定性带来的误判和漏判。对其检测原理进行了分析,通过在中国环境科学院内模拟实验与贵州榕江填埋场现场试验,对传统的高压直流检测方案与低频交流检测方案进行了对比。结果表明：当信号频率为1~10 Hz之间时,基于FFT的低频交流信号填埋场渗漏检测方案可行,抗干扰能力更强,检测电压稳定性更强,准确度更高,并且可以提高检测精度。A new landfill detection scheme with low-frequency AC signal is proposed,which is based on FFT,to solve the practical problem that high voltage DC detection method for landfill with less stable and less accuracy. This scheme can improve the leakage detection accuracy of landfill real time detection system,meanwhile greatly reduce the misjudgments that caused by the voltage stability. The principle of this scheme was analyzed,and traditional high voltage DC method and lowfrequency AC method were compared through the simulated experiment in CRAES and the field experiment in Rongjiang,Guizhou Province. The experimental data showed that when the signal frequency is between 1 Hz and 10 Hz,the low-frequency AC method based on FFT is effective for detecting the leakage,with a greater stability and higher accuracy,as well as the improved detection accuracy.

关 键 词：填埋场 渗漏检测 FFT 双极性方波 低频交流 

分 类 号：X705[环境科学与工程—环境工程]