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

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2009.01.006· OSTI ID:21269340

Tallec, G; Bureau, C ^[1]; Peu, P; Benoist, J C ^[2]; Lemunier, M ^[3]; Budka, A; Presse, D ^[4]

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1. Cemagref, UR HBAN, Parc de Tourvoie, BP44, F-92163 Antony (France)
2. Cemagref, UR GERE, 17 Avenue de Cucille, CS 64427, F-35044 Rennes (France)
3. Suez-Environnement, CIRADE, 38 Av. Jean Jaures, 78440 Gargenville (France)
4. SITA France, 132 Rue des 3 Fontanot, 92000 Nanterre Cedex (France)

This study evaluates the impact of nitrate injection on a full scale landfill bioreactor through the monitoring of gaseous releases and particularly N{sub 2}O 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 (CO{sub 2}, CH{sub 4} and N{sub 2}O) in the gas extraction network. However, nitrate-enhanced leachate recirculation induced a marked increase of the N{sub 2}O 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 N{sub 2}O 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 N{sub 2}O releases: 8.1 {+-} 0.16 mg m{sup -2} d{sup -1} (n = 384), 4.2 {+-} 0.14 mg m{sup -2} d{sup -1} (n = 132) and 1.9 {+-} 0.10 mg m{sup -2} d{sup -1} (n = 49), during, after raw leachate and nitrate-enhanced leachate recirculation, respectively. No clear correlation between N{sub 2}O gaseous surface releases and recirculation events were evidenced. Estimated N{sub 2}O fluxes remained in the lower range of what is reported in the literature for landfill covers, even after nitrate injection.

• OSTI ID: 21269340
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 7 Vol. 29; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
CARBON DIOXIDE
ELECTRON-CAPTURE DETECTORS
LANDFILL GAS
METHANE
NITRATES
NITROUS OXIDE
SANITARY LANDFILLS