Impact of nitrate-enhanced leachate recirculation on gaseous releases from a landfill bioreactor cell - Archive ouverte HAL Access content directly
Journal Articles Waste Management Year : 2009

Impact of nitrate-enhanced leachate recirculation on gaseous releases from a landfill bioreactor cell

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Abstract

This study evaluates the impact of nitrate injection on a full scale landfill bioreactor through the monitoring of gaseous releases and particularly N2O emissions. During several weeks, we monitored gas concentrations in the landfill gas collection system as well as surface gas releases with a series of seven static chambers. These devices were directly connected to a gas chromatograph coupled to a flame ionisation detector and an electron capture detector (GC-FID/ECD) placed directly on the field. Measurements were performed before, during and after recirculation of raw leachate and nitrate-enhanced leachate. Raw leachate recirculation did not have a significant effect on the biogas concentrations (CO2, CH4 and N2O) in the gas extraction network. However, nitrate-enhanced leachate recirculation induced a marked increase of the N2O concentrations in the gas collected from the recirculation trench (100-fold increase from 0.2 ppm to 23 ppm). In the common gas collection system however, this N2O increase was no more detectable because of dilution by gas coming from other cells or ambient air intrusion. Surface releases through the temporary cover were characterized by a large spatial and temporal variability. One automated chamber gave limited standard errors over each experimental period for N2O releases: 8.1 ± 0.16 mg m−2 d−1 (n = 384), 4.2 ± 0.14 mg m−2 d−1 (n = 132) and 1.9 ± 0.10 mg m−2 d−1 (n = 49), during, after raw leachate and nitrate-enhanced leachate recirculation, respectively. No clear correlation between N2O gaseous surface releases and recirculation events were evidenced. Estimated N2O fluxes remained in the lower range of what is reported in the literature for landfill covers, even after nitrate injection.
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Dates and versions

hal-02594860 , version 1 (15-05-2020)

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Cite

G. Tallec, C. Bureau, Pascal Peu, J.C. Benoist, M. Lemunier, et al.. Impact of nitrate-enhanced leachate recirculation on gaseous releases from a landfill bioreactor cell. Waste Management, 2009, 29 (7), pp.2078-2084. ⟨10.1016/j.wasman.2009.01.006⟩. ⟨hal-02594860⟩

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