N₂O Emissions at Solid Waste Disposal Sites in Osaka City

Abstract

Nitrous oxide (N 2 0) is a trace gas contributing to stratospheric ozone depletion and global warming. Although a large quantity of information exists about N 2 0 emissions from various ecosystems, this study was initiated to demonstrate the features of N 2 0 emissions from sea-based waste disposal sites in Osaka City in relation to CH 4 emissions.Average N 2 0 emissions at an active landfill (S-Site) were several times higher than those at a closed landfill (N Site). Average CH 4 emissions were also much greater at the S-Site. Regarding the nature of N 2 0 emissions, remarkable emissions often were observed with aerobic waste layers at the N-Site, suggesting almost inversely related N 2 0 emissions with CH 4 production at the N-Site. However, at the S-Site a few exceptionally high N 2 0 emissions were noted in cases of high CH 4 emissions.

Understanding Flow of Carbon and Nitrogen in Malaysian Sanitary Landfill

“…Landfill N 2 O is considered an insignificant source globally (Bogner et al 1999, Rinne et al 2005, but may need to be considered locally where cover soils are amended with sewage sludge (Borjesson & Svensson 1997a) or where aerobic/ semi-aerobic landfill designs are implemented. (Tsujimoto et al 1994). Substantial emissions of CH 4 and N 2 O can occur during wastewater transport in closed sewers.…”

Bioreactor Landfills: Comparison and Kinetics of the Different Systems

“…In this study, the improvement of landfill gas quality performed by the landfill bioreactors has been considered only in terms of CH 4 reductions. Nitrous oxide emissions can become an issue when bioreactor landfills are implemented, since both leachate recirculation (Price et al, 2003;Vigneron et al, 2007;Watzinger et al, 2005) and aeration (Berge et al, 2006;Powell et al, 2006;Tsujimoto et al, 1994) may induce N 2 O production. N 2 O production can result both from partial nitrification and partial denitrification (Mummey et al, 1994;Venterea and Rolston, 2000).…”

Short Report: Effects of Biochar Addition on Manure Composting and Associated N<sub>2</sub>O Emissions

“…But at the conditions of low O 2 contents, 3 NO − -N in the manure emits N 2 O through incomplete denitrification process [17] [18]. Considering the shortage of oxygen for most composting piles, denitrifiation is responsible for the most part of N 2 O generation in composting, while nitrification makes a substantial contribution to the N 2 O emission at the surface of composting pile where O 2 is adequate and temperature is suitable [19].…”