6.1.1 Changes compared to 1996 Guidelines and Good
Practice Guidance
The Revised 1996 IPCC Guidelines (1996 Guidelines, IPCC, 1997) included separate equations to estimate
emissions from wastewater and from sludge removed from the wastewater. The distinction has been removed
because the CH4 generation capacities for sludge and wastewater with dissolved organics are generally the same,
and separated equations are not necessary. The 2006 Guidelines include a new section to estimate CH4 emissions
from uncollected wastewater. Also, guidance has been included to estimate N2O emissions from advanced
wastewater treatment plants. Furthermore, the industrial wastewater section has been simplified by suggesting
that only the most significant industrial sources need to be addressed. See Section 6.2.3