Ref 47: Referenced Portion of “Money for old rope?” Article is Copied Below:
To understand biodegradation, it is useful to think about the biodegradable fraction of waste. Cellulose [(C6H10O5)n] and hemicellulose [(C5H8O4)n] are the major biodegradable components of waste; the other major organic component, lignin (a structural component of wood) is largely not degradable under typical landfill conditions.
Residential waste contains 40-50% cellulose, 7-10% hemicellulose and 10-20% lignin. The cellulose, hemicellulose and lignin contents of various types of paper, food waste and yard waste …
Under anaerobic conditions, the decomposition of cellulose and hemicellulose can be described by equations (2) and (3):
(C6H10O5)n + nH2O ’ 3nCO2 + 3nCH4 (2)
(C5H8O4)n + nH2O ’ 2.5nCO2 + 2.5nCH4 (3)
Equations (2) and (3) are simplifications of a complex series of reactions involving communities of microorganisms.
[End of Ref 47.]
About the Article
- Trends in landfilling
- The biodegradation process
- The carbon cycle and climate change
- I’m concerned about climate change. Is waste decomposition in a landfill good?
- What is the relationship between carbon sequestration and landfill gas?
- Carbon sequestration and the drivers to measure carbon
Differences in Approach Between the US and Europe
Summary – Quoted Text Fromﾠ”Money for Old Rope”
“In summary, landfills generate methane during waste decomposition. This methane can be captured and converted to energy. Therefore, capturing landfill gas is good for climate change. Sequestering, or permanently storing carbon in the landfill, is also helpful.”ﾠ“It is vital for landfill owners to maintain accurate records on the quantities and composition of the waste entering their landfills and for policymakers to recognize the value of landfills in carbon sequestration. Proper accounting for carbon sequestration in landfills must be included in landfill emissions protocols to document actual greenhouse gas emissions at landfills.”ﾠ