One can start with: ...

Published by

One can start with:
http://www.tandfonline.com/doi/abs/10.1080/20430779.2015.1012618?journalCode=tgmm20

or

Carbon sequestration and greenhouse gases emissions in soil under sewage sludge residual effects

and

Calculator Tool for Determining Greenhouse Gas Emissions for Biosolids Processing and End Use

A web search will provide additional references.