Quantification of greenhouse gas emissions from windrow composting of garden waste.

Microbial degradation of organic wastes entails the production of various gases such as carbon dioxide (CO(2)), methane (CH(4)), nitrous oxide (N(2)O), and carbon monoxide (CO). Some of these gases are classified as greenhouse gases (GHGs), thus contributing to climate change. A study was performed to evaluate three methods for quantifying GHG emissions from central composting of garden waste. Two small-scale methods were used at a windrow composting facility: a static flux chamber method and a funnel method. Mass balance calculations based on measurements of the C content in the in- and out-going material showed that 91 to 94% of the C could not be accounted for using the small-scale methods, thereby indicating that these methods significantly underestimate GHG emissions. A dynamic plume method (total emission method) employing Fourier Transform Infra Red (FTIR) absorption spectroscopy was found to give a more accurate estimate of the GHG emissions, with CO(2) emissions measured to be 127 +/- 15% of the degraded C. Additionally, with this method, 2.7 +/- 0.6% and 0.34 +/- 0.16% of the degraded C was determined to be emitted as CH(4) and CO. In this study, the dynamic plume method was a more effective tool for accounting for C losses and, therefore, we believe that the method is suitable for measuring GHG emissions from composting facilities. The total emissions were found to be 2.4 +/- 0.5 kg CH(4)-C Mg(-1) wet waste (ww) and 0.06 +/- 0.03 kg N(2)O-N Mg(-1) ww from a facility treating 15,540 Mg of garden waste yr(-1), or 111 +/- 30 kg CO(2)-equivalents Mg(-1) ww.

[1]  T. H. Christensen,et al.  Composting and compost utilization: accounting of greenhouse gases and global warming contributions , 2009, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[2]  Pierre Gy,et al.  Sampling for analytical purposes , 1998 .

[3]  J. Chanton,et al.  A national landfill methane budget for Sweden based on field measurements, and an evaluation of IPCC models , 2009 .

[4]  Thomas H Christensen,et al.  C balance, carbon dioxide emissions and global warming potentials in LCA-modelling of waste management systems , 2009, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[5]  H. Hellebrand,et al.  Emission of Nitrous Oxide and other Trace Gases during Composting of Grass and Green Waste , 1998 .

[6]  S. G. Sommer,et al.  Techniques for measuring gas emissions from a composting stockpile of cattle manure , 2004 .

[7]  Håkan Jönsson,et al.  SE—Structures and Environment , 2001 .

[8]  Emission of carbon monoxide during composting of dung and green waste , 2001, Nutrient Cycling in Agroecosystems.

[9]  F. Richter,et al.  Kinetic Isotopic Fractionation During Diffusion of Ionic Species in Water , 2005 .

[10]  Carsten Cuhls,et al.  Green house gas emissions from composting and mechanical biological treatment , 2008, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[11]  M. Mizuochi,et al.  Nitrous oxide emissions from aerated composting of organic waste. , 2001, Environmental science & technology.

[12]  B. Bilitewski,et al.  Mechanical Biological Treatment , 2010 .

[13]  U. Sonesson,et al.  Formation and Emission of N2O and CH4 from Compost Heaps of Organic Household Waster , 2000 .

[14]  D. Blake,et al.  Atmospheric emissions and attenuation of non-methane organic compounds in cover soils at a French landfill. , 2008, Waste management.

[15]  Charlotte Scheutz,et al.  Mass balances and life-cycle inventory for a garden waste windrow composting plant (Aarhus, Denmark) , 2010, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[16]  L. Zelles,et al.  Emission of Climate-Relevant Trace Gases and Succession of Microbial Communities during Open-Windrow Composting , 1997, Applied and environmental microbiology.

[17]  P. Kjeldsen,et al.  Lateral gas transport in soil adjacent to an old landfill: factors governing gas migration , 2001, Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA.

[18]  B. Galle,et al.  Measurements of methane emissions from landfills using a time correlation tracer method based on FTIR absorption spectroscopy. , 2001, Environmental science & technology.

[19]  Bo H. Svensson,et al.  Seasonal and Diurnal Methane Emissions From a Landfill and Their Regulation By Methane Oxidation , 1997 .

[20]  H. Hellebrand,et al.  Carbon monoxide from composting due to thermal oxidation of biomass. , 2008, Journal of environmental quality.

[21]  T. S. West Analytical Chemistry , 1969, Nature.

[22]  D. Blake,et al.  Comparative oxidation and net emissions of methane and selected non-methane organic compounds in landfill cover soils. , 2003, Environmental science & technology.

[23]  G. L. Hutchinson,et al.  Vents and seals in non‐steady‐state chambers used for measuring gas exchange between soil and the atmosphere , 2001 .