Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
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Table 3-41. Total Mercury Concentrations Measured at Site #2 during the October 2007<br />
Field Campaign<br />
Tube # Spike Recovery (%) Conc (µg/m3) Date<br />
1 0.53 10/23/2007<br />
2 0.42 10/23/2007<br />
3 0.11 10/23/2007<br />
CCV 106 Average=0.35<br />
Total mercury concentrations in the landfill gas at Site #2 ranged <strong>from</strong> 0.11 to 0.53 µg/m 3 , with<br />
an average of 0.35 µg/m 3 for all of the samples. Continuous calibration verification (CCV)<br />
recoveries were 106%.<br />
3.3.2 <strong>Gas</strong> Sampling Results<br />
Table 3-42 presents the results of the gas composition data collected at Sites #1 and #2 with the<br />
Landtec GEM 2000+ landfill gas monitor. <strong>Gas</strong> flowrates were measured using an Airfoil pitot<br />
probe with the Shortridge ADM-870 Airdata Multimeter to determine gas velocities.<br />
Table 3-42. <strong>Landfill</strong> <strong>Gas</strong> Composition Data Collected at Sites #1 and #2 during the<br />
October 2007 Field Campaign<br />
Site #1 Site #2<br />
Duct Diameter (inches) 11 9<br />
Area (square feet) 0.66 0.44<br />
<strong>Gas</strong> Velocity (feet/minute) 2880 1679<br />
<strong>Gas</strong> Flow Rate (CFM) 1901 742<br />
Methane (%) 47.4 36.5<br />
Carbon Dioxide (%) 36.2 34.8<br />
Oxygen (%) 2.6 2.4<br />
N2 Balance (%) 13.7 26.2<br />
Hydrogen Sulfide (ppmv) 83 Invalid Data<br />
Carbon Monoxide (ppmv) 0 to 3 0<br />
<strong>Gas</strong> sampling results <strong>from</strong> the landfill gas monitor were consistent with readings taken <strong>from</strong><br />
other landfills of similar size and age. The Landtec landfill gas monitor was calibrated using a<br />
gas cylinder containing a mixture of 50-percent methane and 35-percent carbon dioxide in a<br />
balance of nitrogen. The landfill gas monitor has a manufacturer’s specified accuracy of ±3<br />
percent for methane and carbon dioxide, and an accuracy of ±1 percent for oxygen.<br />
A small amount of carbon monoxide was detected at Site #1 possibly due to a small fire present<br />
in the landfill. Carbon monoxide was not detected at Site #2. Hydrogen sulfide was detected at<br />
3-41