The steps for good practice in inventory preparation for CH4 from domestic wastewater are as follows:
Step 1: Use Equation 6.3 to estimate total organically degradable carbon in wastewater (TOW).
Step 2: Select the pathway and systems (See Figure 6.1) according to country activity data. Use Equation 6.2
to obtain the emission factor for each domestic wastewater treatment/discharge pathway or system.
Step 3: Use Equation 6.1 to estimate emissions, adjust for possible sludge removal and/or CH4 recovery and
sum the results for each pathway/system.