Gawande Nitin A, Reinhart Debra R, Thomas Philip A, McCreanor Philip T, Townsend Timothy G
University of Central Florida, PO Box 162993, Orlando, FL 32816-2993, USA.
Waste Manag. 2003;23(7):667-74. doi: 10.1016/S0956-053X(03)00100-4.
Moisture content (MC) is a crucial parameter for degradation of solid waste in landfills. Present MC measurement techniques suffer from several drawbacks. A moisture sensor for measurement of in situ moisture content of solid waste in landfills was developed. The sensor measures the electrical resistance across the granular matrix of the sensor, which in turn can be correlated to moisture content. The sensor was also equipped with a thermocouple and tubing that permits simultaneous measurement of temperature and gas sampling. The electrical conductivity of the surrounding moisture and the temperature in the matrix both affect the resistance measurements. This paper describes the results of laboratory experiments designed to select the appropriate granular media particle size, measure the influence of moisture electrical conductivity and temperature, and develop calibration relationships between measured resistance and gravimetrically determined moisture content. With a few limitations, the sensor is able to detect MC of solid waste under conditions allowing moisture movement into the sensor. The application of this technique shows promise for use in bioreactor landfills where high moisture contents are expected and desired.
水分含量（MC）是垃圾填埋场中固体废物降解的关键参数。目前的水分含量测量技术存在若干缺点。开发了一种用于测量垃圾填埋场中固体废物原位水分含量的湿度传感器。该传感器测量传感器颗粒基质两端的电阻，而电阻又可与水分含量相关联。该传感器还配备了热电偶和管道，可同时测量温度和进行气体采样。周围水分的电导率和基质中的温度都会影响电阻测量。本文描述了旨在选择合适的颗粒介质粒径、测量水分电导率和温度的影响以及建立测量电阻与重量法测定的水分含量之间校准关系的实验室实验结果。尽管存在一些局限性，但该传感器能够在允许水分进入传感器的条件下检测固体废物的水分含量。这项技术的应用有望用于预期并需要高水分含量的生物反应器填埋场。
