Thermal Science 2016 Volume 20, Issue 4, Pages: 1283-1294
https://doi.org/10.2298/TSCI160401137D
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Impact assessment of concentrate recirculation on the landfill gas production
Džolev Nikola M. (Teing doo, Novi Sad)
Vujić Goran V. (Faculty of Technical Sciences, Department of Environmental Engineering and Occupational Safety, Novi Sad)
This paper explores the impact of concentrate recirculation, as a product of
leachate treated by reverse osmosis plant, on the production of landfill gas
at the real-scale landfill for municipal solid waste. In an effort to come up
with results experimental measurements were carried out at the landfill in
Bijeljina. All measurements performed, were divided into 3 groups. The aims
of two groups of measurement were to determine landfill gas and methane yield
from concentrate and leachate in laboratory conditions (1st group) and to
find out concentrations of oxidizing matters (COD and BOD5) present in
leachate and concentrate at different points of treatment as well as its
variability over the time (2nd group) which could be used to calculate the
potential of landfill gas and methane generation from concentrate by
recirculation, theoretically. 3rd group of measurements, carried out in
parallel, have goal to determine the quality and quantity of the collected
landfill gas at wells throughout the landfill. The results of analysis
carried out in this experimental research show the clear evidence of
concentrate recirculation impact on methane production by increasing the
landfill gas flow, as well as its concentration within the landfill gas
composition, at the nearby well. Although results indicated relatively high
impact of concentrate recirculation on landfill gas production, comparing to
its theoretical potential, the influence on the landfill at whole, is
negligible, due to relatively low volumes in recirculation with respect to
its size and objectively low potential given by organic matter present in
concentrate.
Keywords: reverse osmosis, concentrate recirculation, methane production, renewable energy, LFG wells