chapter 4: temperature inside the landfill

time. However, moisture sensors significantly overestimated moisture content as reported by
Jonnalagadda (2004).
Days 145
176
207
238
269
300
331
362
393
424
455
486
517
548
579
610
641
672
Injection events
703
733
764
795
T-drop and R-drop events
826
857
888
919
950
981
1012
1043
1074
1105
1136
1167
1198
Figure 4-5. Injection events at C-C7 (green, yellow and red), R-drop (Blue) and T-drop events
(yellow) at monitoring location M-C7-Y
From Figure 4-5, it can be observed that liquid injected during the second or following
injection did not lead to a significant temperature drop which may be explained by the heating of
the liquid while moving through the waste in the landfill. During the second or following
injections, as the liquid travels through the waste, it warms as a result of augmented biological
activity. This observation is supported by analysis of the temperature reported by sensor M-C7-
Y, where it was observed th at the temperature constantly increased after the first injection and
temperatures recorded during second or following events were above 50 0 C. This effect was also
confirm ed with other injection/monitoring locations. The channeling effect was also observed in
liquid movement as suggested by the nearly simultaneous occurrence of injection event at
injection well and temperature drop event at the monitoring well in several instances.
57