AI Article Synopsis
- Sewage sludge contributes significantly to greenhouse gas emissions in organic waste management.
- The study measured total GHG emissions from anaerobic digestion, accounting for both direct and indirect emissions, and noted that the digestion process itself does not produce GHGs.
- The findings showed that total GHG emissions decreased due to anaerobic digestion’s effectiveness compared to landfilling and by utilizing biogas instead of natural gas, resulting in emissions of 0.7214 MgCO2 MgWS(-1) in northern China and 0.7384 MgCO2 MgWS(-1) in southern China.
Article Abstract
Sewage sludge is a considerable source of greenhouse gas (GHG) emission in the field of organic solid waste treatment and disposal. In this case study, total GHG emissions from sludge anaerobic digestion, including direct and indirect emissions as well as replaceable emission reduction due to biogas being reused instead of natural gas, were quantified respectively. The results indicated that no GHG generation needed to be considered during the anaerobic digestion process. Indirect emissions were mainly from electricity and fossil fuel consumption on-site and sludge transportation. Overall, the total GHG emission owing to relative subtraction from anaerobic digestion rather than landfill, and replaceable GHG reduction caused by reuse of its product of biogas, were quantified to be 0.7214 (northern China) or 0.7384 (southern China) MgCO2 MgWS(-1) (wet sludge).
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| http://dx.doi.org/10.2166/wst.2015.472 | DOI Listing |
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