Comparison of Resistivity and Time Domain Reflectometry Sensors for Assessing Moisture Content in Bioreactor Landfills

Instruments that can monitor the in situ moisture content of landfilled waste would be of great benefit to landfill operators, especially those operating their facilities as bioreactor landills (wet landfills). Two instrumentation technologies for measuring in situ moisture content (resistivity sensors and time domain reflectometry (TDR)) in landfills were examined and compared. Resistivity and TDR instruments were installed in close proximity at multiple locations in a leachate recirculation well field at a bioreactor landfill in Florida, and resulting moisture content measurements were assessed. The resistivity instruments were less expensive, easier to install, and found more reliable over time than TDR sensors. Both technologies predicted transient moisture changes in the landfill. The magnitudes of the moisture content values obtained using the two technologies were much higher compared to values estimated using mass balance, suggesting that accurate calibration to field conditions is difficult.

[1]  Thomas A. McMahon,et al.  Monitoring In Situ Moisture Content of Municipal Solid Waste Landfills , 2000 .

[2]  A. P. Annan,et al.  Electromagnetic determination of soil water content: Measurements in coaxial transmission lines , 1980 .

[3]  Robert Horton,et al.  Determining Soil Water Flux and Pore Water Velocity by a Heat Pulse Technique , 2000 .

[4]  Ramin Yazdani,et al.  Field application of partitioning gas tracer test for measuring water in a bioreactor landfill. , 2007, Environmental science & technology.

[5]  Debra R. Reinhart,et al.  Estimating the Hydraulic Conductivity of Landfilled Municipal Solid Waste Using the Borehole Permeameter Test , 2006 .

[6]  Pradeep Jain,et al.  Field evaluation of resistivity sensors for in situ moisture measurement in a bioreactor landfill. , 2009, Waste management.

[7]  Chris Zeiss,et al.  In situ Moisture Content Measurement in MSW Landfills with TDR , 2001 .

[8]  Roger Guérin,et al.  Review of state of the art methods for measuring water in landfills. , 2007, Waste management.

[9]  J. Rees,et al.  Optimisation of methane production and refuse decomposition in landfills by temperature control , 2007 .

[10]  D. C. Kincaid,et al.  Operational Characteristics of the Watermark Model 200 Soil Water Potential Sensor for Irrigation Management , 1992 .

[11]  M. Khire,et al.  Leachate Recirculation in Bioreactor Landfills Using Geocomposite Drainage Material , 2007 .

[12]  Timothy G Townsend,et al.  Municipal solid waste in situ moisture content measurement using an electrical resistance sensor. , 2003, Waste management.

[13]  Debra R. Reinhart,et al.  Air Permeability of Waste in a Municipal Solid Waste Landfill , 2005 .